acs102v3 Floating floor
Content
When you need a floating floor
to dramatically Increase your
Sound Transmission Class and
Impact Noise Rating
BULLETIN
ACS-102-3
Why not use the
MASON
JACK-UP
FLOOR SLAB
SYSTEM
and eliminate the cost and need for:
• Combustible, rot prone plywood forms.
• A myriad of transmission paths through
closely spaced supports.
• Moisture retaining fiberglass infill that plugs
sub-drains and encourages vermin.
while gaining:
• An easier, lower frequency isolation method.
• A positive air gap.
• A floor supported by Mason Low Dynamic
Stiffness Rubber– the time tested, low
frequency, exposure-proof and truly
structural material, at lower cost.
Our Riverbank Test Data demonstrates that a four-inch
thick concrete floor floating on neoprene mounts improves
the STC by 25 if raised two inches and that the INR goes
up by 44... Tests using our lower frequency LDS mounts
would add to these tremendous improvements.
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Remember, the air gap is the isolator, the jack-screw
lifts the floor to achieve it, and the resilient LDS element
supports the weight while working in parallel with the air.
Mason Industries
originated this
system in 1965.
Why not work with
the company that
created the idea
and has over
1000 successful
installations?
1" to 4"
Air Gap
MASON INDUSTRIES, Inc.
International Manufacturers of Shock, Seismic and Vibration
Control Products, Acoustical Floor Systems, Building Isolation,
Rubber Expansion Joints for Piping and Stainless Steel Hoses
Business Card
To the Architect:
We have been floating floors, resiliently suspending ceilings and isolating walls for close
to 45 years. The need for this acoustical reinforcement has been well established in textbooks, sales literature and acoustical engineering recommendations. Therefore, we
thought it would be helpful to offer a handbook of specific methods and suggested specifications rather than just print another interesting but rather general brochure.
1. There are basically two methods of reducing airborne sound transmission. The first is
to increase the mass of the walls, floors or ceilings and the second is to introduce an air gap
between relatively airtight constructions.
2. When dealing with a monolithic building component such as a solid concrete floor doubling the mass raises the STC by a maximum of 5. Actual test results are shown graphically on page 3. Because of this it becomes impractical to rely on mass alone as a 6” solid
concrete floor has an STC of 54. Doubling to 12” raises the STC to 59. Doubling again to
an unacceptable 24” raises the STC to only 64.
3. Once you decide on the maximum practical weight for the construction the next acoustical step is to split this mass into two components sandwiching an air gap. This air gap triggers a tremendous improvement in STC as shown by the Riverbank Tests of a floating floor
with flanking protection. (Test Two, page 3.) Notice that the addition of a 4” concrete pour
on the original 6” raised the STC from 54 to only 57. The introduction of a 2” air gap between
these sections raised the STC to 79 for a dramatic improvement of 22. Increasing the air
gap to 4” raised the STC to 82. Doubling the air gap raises the STC a theoretical 5, but the
actual result is more like 3 because of resonances.
4. The introduction of lightweight fiberglas in the air space between massive structural elements such as concrete floors or walls is expensive and unimportant. The experimental
inclusion in a 2” void increased the STC by 3 beyond the original 79. (Test Two, page 3.)
This is meaningless at these levels as the 79 is all but unattainable in a commercial structure because of flanking. Fiberglas is an important addition over suspended ceilings, however, where the mass is light and the contribution noticeable.
5. The air gap is the isolator. The purpose of the vibration mounting is to provide structural support without voiding the air gap. Since each mount is a potential transmission path, it
is logical that the fewer mounts or support points, the better the chance of protecting and
not bypassing the air gap.
6. Specifications should be written by the professional for the protection of the client and
not the protection of the vendor. Specifications should emphasize performance characteristics, physical properties and construction rather than manufacturing techniques. In describing a steel spring it would be unimportant whether the steel was produced by the Bessemer
or Open Hearth method. The molder need not be told the proper curing temperature or carbon black particle size and certainly, the glass people know the specific technique for manufacturing fiberglas. It would be important in specifying steel springs to keep the operating
stresses well within the elastic limit; to describe rubber mounts in terms of tensile strength,
permanent set, elongation, compression set, etc. A proper dialogue regarding fiberglas
would similarly cover permanent set, dynamic frequency and most importantly waterproofing tests of this sensitive material that fails when wet.
7. All vendors tend to favor their own products rather than those of their competitors. As
opposed to this, an acoustical expert studies all of the available materials and recommends
what in his unbiased judgment is best for the application. If there is no such person within
your own organization, we continue to suggest that you retain an outside acoustical consultant to help you in this most critical field of client sensitivity.
We would appreciate your comments as to subjects not covered, our method of presenting
this information or any other suggestions to make this booklet more valuable to yourselves
and other people in the architectural and acoustical disciplines.
Very truly yours, MASON INDUSTRIES, INC.
Letter to the Architect
Technical Information & Tests
Concrete Floating Floor Discussion
Replacing Neoprene with LDS
LDS Jack-up Specifications
2
2
3
4&5
6
7 – 12
Table of Contents
Spring Jack-Up Specifications
LDS Form-Work Specifications
Isolated Wall Discussion
Isolated Wall Specifications
12 & 13
14 – 18
19
20 & 21
Isolated Ceiling Discussion
Isolated Ceiling Specifications
Wooden Floating Floor
Discussion & Specification
22
23
24
Mason 4” Thick FSN Floating Floor Tests conducted at
the Riverback Acoustical Laboratory in March and June of 1971.
Effects of 0, 1”, 2”, 3” and 4” Air Gaps on STC & INR.
Business Card
Logo
6” CONCRETE BLOCK
FLANKING
PATHS
W30N HANGERS
5/8” GYPSUM BOARD
SOURCE
ROOM
FLOOR
TEST
ONLY
NOISE
SOURCE
SEAL
1” FIBREGLAS
& CAULKING
FLANKING
PROTECTED
FLOOR TEST
AIR GAP
FSN
JACK UP
MOUNTS
FIBREGLAS
2” POURED
CONC TOPPING
4” FLOATING
CONCRETE
FLOOR
14” T-SECTIONS
SOUND
SOURCE
ROOM
FSN
JACK UP
MOUNTS
4” FLOATING
CONCRETE
FLOOR
RECEIVING
ROOM
MIKE
RECEIVING
ROOM
FIRST TEST MARCH 1971 OF A FLOATING FLOOR ONLY.
DISAPPOINTING RESULTS BECAUSE OF FLANKING PROBLEMS
SECOND TEST JUNE 1971 OF SAME FLOATING FLOOR WITH
ISOLATED WALLS AND CEILING TO PREVENT FLANKING
FIRST TEST DATA IN BROWN, SECOND TEST DATA IN BLACK
FIRST TEST DATA IN BROWN, SECOND TEST DATA IN BLACK
TRANSMISSION LOSS (dB) COMPARISON
Freq. Basic T
Air gaps without
2” air gap
(Hertz) sections
fiber glass infill
with 75%
(cps) and 2”
fiber glass
cover
0”
1”
2”
3”
4”
infill
100
39
38 38 43 50 42 56 45 59 46 56
57
125
39
47 47 44 57 44 60 47 62 47 63
59
160
40
46 46 45 55 45 58 47 59 47 61
61
200
42
49 49 46 63 45 65 46 67 46 66
68
250
45
51 51 47 67 48 69 50 72 50 72
73
315
49
52 52 54 73 54 75 55 77 54 78
79
400
47
50 50 56 73 56 74 57 74 57 77
78
55 55 58 78 59 80 60 80 60 82
83
500
50
630
52
54 54 61 83 62 85 62 86 62 87
86
Riverbank TL-71-152 March 71 Riverbank TL-71-247 June 71
TRANSMISSION LOSS (dB) COMPARISON
Freq. Basic T
Air gaps without
2” air gap
(Hertz) sections
fiber glass infill
with 75%
(cps)
and 2”
fiber glass
cover
0”
1”
2”
3”
4”
infill
800
51
52 52 63 85 63 86 64 87 65 86
88
1000
52
55 55 68 88 68 88 69 88 69 87
89
1250
55
58 58 72 93 72 93 72 92 73 91
95
1600
58
61 61 74 97 73 96 74 95 75 93
97
2000
60
63 63 75 97 75101 76 99 77 97
97
2500
62
65 65 80 101 79104 79 101 80101
100
3150
65
67 67 82 104 84105 85 107 86103
104
4000
68
71 71 87 105 90106 92 105 91104
106
5000
70
72 74 91 102 93101 100 99 97 99
103
57 57 61 76 61 79 63 80 63 82
82*
STC
54
-27 -27 17 17 17 17 17 17 18 18
INR
IIC
-24 -24 68 68 68 68 68 68 69 69
Riverbank TL-71-152 March 71 Riverbank TL-71-247 June 71
40
MASON LOW DYNAMIC STIFFNESS (LDS)
BRIDGE BEARING COMPOUNDS.
DYNAMIC NATURAL FREQUENCY/
DEFLECTION CHART
Tested Dynamic Stiffness
DuroDynamic
meter Compound Stiffness
20
10
8
6
Duro
40-60
Test
60 A-24071-6F 1.30 WIA61797
50 A-24071-6B 1.28 WIA4495
40 A-24070-5
1.17 WIA4495
1.4 Dynamic
Stiffness
Design Curve
4
40-60
2
0.02
Design
Curve
0.04 0.06 0.1
0.2
0.4 0.6 0.8
STATIC DEFLECTION (inches)
AVERAGE STC per ASTM E90 & RM14-2
DYNAMIC NATURAL FREQUENCY (Hertz)
*While the use of infill raises the STC an additional 3 in a 2” air gap, we
feel it is overkill as field flanking will prevent achieving the higher value.
The floating floor @79 STC is already the most sound resistant path.
70
STANDARD MASS/STC LIMP MASS LAW
PREDICTION AND TEST DATA
60
T
DIC
50
ASS
PRE
LAW
PM
LIM
IT
ION
LIM
ER
UPP
IT
LIM
ER
LOW
S
ENT
REM
40
UAL
ASU
ME
ACT
30
Data based on tests conducted by
Riverbank Acoustical Laboratories
20
10
2
4
6 8 10
20
40 60 80 100
FLOOR, WALL or CEILING WEIGHT (lb/ft2)
3
SPRINCONCRETE FLOATING FLOORS discussion
Business Concrete
Card
floating floors are used for many purposes. We have limited this bulletin to the following areas
Logoof Vibration, Sound and Impact Isolation.
1. VIBRATION ISOLATION
Buildings are unavoidably near busy streets, trains and subways even though they contain space that
must be vibration free and have very low NC levels. Examples include television studios and theatres
and in some cases sound test rooms located in the center of factories.
The frequency of the isolator supporting these floors is normally determined by the architect or an
acoustical consultant depending on the input frequencies. Within our range of experience we recommend LDS mountings with a dynamic frequency not exceeding 10 Hz for input no lower than 20 Hz
providing frequencies below 30 Hz are limited in amplitude. Steel spring isolators come into their own
when the input is more severe or below 20 Hz. The required deflection of the springs is dependent on
the input frequency, but most spring floating floor work is done with deflections between 0.5” and 0.75”
to provide frequencies in the 4.5 to 3.6 Hz range. When heavy impact is a major factor, springs are
always required.
We have provided LDS isolators to reduce subway vibration at grade. They were very effective as the
lowest input frequency was measured at 20 Hz and the ground amplitudes were small. In
another application, however, television studios were located on the third floor of an old building. Spring
mountings were specified by the same acoustical consultant as the upper floor amplitudes were high
and frequencies low, not only because of motor truck traffic outside the building, but the passage of
heavy scenery wagons in halls between studios.
VIBRATION
2. SOUND ISOLATION
Typical of these applications are the introduction of floating floors in very noisy equipment rooms located over prime office space or floating roofs as a protection against aircraft noises.
Since we are dealing with the prevention of airborne noise transmission only, LDS mountings are
always the choice. The lowest audible frequency is about 25 Hz so there is no need for mountings of
greater deflection. Spring mountings manufactured with LDS materials in series with the springs would
work equally well in this application, but they are needlessly expensive. Since the floating floor’s frequency is too high to isolate machinery, the only function is the prevention of airborne sound transmission. Machinery supported on the floating floor must have steel or air spring isolators.
3. IMPACT ISOLATION
Examples of straight impact isolation would normally include kitchens, weight rooms or bowling alleys.
A commercial kitchen in an office building generates structurally transmitted noise. The noise
level within the kitchen itself might not be very high, but the rolling of carts, the dropping of dishes,
the rattling of cutlery on steel tables, the placing of pots on stoves, etc., all represent impact and
mechanically transmitted sound. LDS isolators have been effective in most of these applications but
springs are better.
Where gym floors are the problem and we must deal with running, jumping and bouncing balls, LDS
would be effective over a very rigid substructure, but once again springs are the safer approach.
SOUND
JACK-UP (Lift-Slab) SYSTEM
We believe that the most fool-proof and safest way to establish the air gap is the jack-up or lift-slab
method. Plastic sheeting is placed on the sub-floor as a breaker layer, isolators are placed on the plastic sheeting, reinforcing steel or mesh rests on the isolator housings, and the concrete floor is poured.
After the concrete has cured, the slab is lifted to elevation by turning adjustment bolts above each isolator to any specified air gap between 1” and 4”.
FORM-WORK SYSTEM
The alternate, almost obsolete, method is one whereby a continuous layer of the isolation media is
used as a pouring surface. More commonly, individual isolators, the thickness of the air gap are placed
in position in the field and covered with plywood or factory attached to plywood before delivery. The
upper surface is covered with a plastic layer and then the reinforcing is placed on top of the plywood
forms and the concrete poured at finished elevation.
MACHINERY SUPPORT
In our older publications we advocated the support of heavy machinery on full sized structurally supported pedestals or individual structurally supported pedestals as shown in the illustrations on page 5.
While the performance of systems installed that way was excellent, it proved to be a major coordination problem because the pedestals had to be located, poured and anchored to the sub-floor before the
system could go ahead. There was very little saving in cost as we provided isolators around the edges
of these pedestals so there was no saving in the number of isolators. There was the additional labor
of installing perimeter board and caulking. We gradually modified our approach to using this method
for only the heaviest of machinery such as chillers, but based on our continued experience we are now
suggesting continuous floating floors with all the housekeeping pads and equipment on top.
IMPACT
1" to 4"
Air Gap
JACK-UP FLOOR
Recommended Spacing 54”
4
JACK-UP VERSUS FORM-WORK METHOD
When the form-work method is used, the spacing of the mountings is a function of the stiffness of the
forms which support the wet concrete. In using half inch plywood, which is the most common form, we
have tested 12”, 16” and 24” spacing. We have found 24” spacing to be highly satisfactory. Closer
spacing merely means more fussing with light capacity mountings and in comparing 12” with 24” spacing the introduction of four times as many transmission points.
Our development of the lift-slab method accelerated in 1962 when we isolated some 30,000 square
feet of television studios for CBS using jack-up spring mountings. The mountings were designed to the
performance specifications of an acoustical consultant. This new method was an immediate success.
When using the lift-slab technique, the spacing of the isolators is determined by the thickness of the
floating floor and the reinforcement. When 4” slabs are used, a spacing of 54” in both directions is
well within design limitations. Thus we have 1/20 the number of transmission pads offered by a form
work or panel system using 12” spacing. Thicker slabs allow for wider spacing and 60” or more is not
unusual.
SPRINCONCRETE FLOATING FLOORS discussion
Business
Card
Structural tests run in 1974 indicate
that 48”
spacing using 6x6x10 gauge mesh 1” from the bottom is
a very safe system for live loads of 150
Lbs. per square foot, or rolling loads of 350 Lbs. per lineal foot.
Logo
Rolling loads must be considered when rigging machines into place. These allowable loadings were
derived from destruction tests, and based on a 3 to 1 safety factor. The full certified Jones Test Report
is available on request. Extremely heavy concentrated loads are accommodated by isolators directly
under the loads or by using heavier local reinforcing to carry the load to mountings paralleling the
equipment. Heavier reinforcement allows greater spacing.
The most advantageous way of using the jack-up system is to roll the heavy equipment into position
before the floor is raised, so there is no danger of cracking the areas of lighter capacity as the machinery rolls by. The floors are raised with the machinery in place. When it is done this way, all mountings
have the most uniform deflection. While this is the ideal way, the concrete people usually want to be
off the job and the machinery is placed after the floor is raised. This is no problem either, as a lifted
floor is no different than a floor poured at elevation.
In thinking about longevity it seems to be a contradiction to use plywood as the form in series with the
isolator. If moisture is present, even exterior plywood will eventually rot. Plywood between floors is a
fire hazard that violates many state codes and fireproof plywood is very expensive. Why worry about
these problems when the plywood can be omitted with the jack-up system?
1" to 4"
Air Gap
FORM-WORK FLOOR
Maximum Spacing 24”
When deformed metallic forms are specified, many of these objections no longer exist as in one direction the support mountings can be moved out to the larger centers. Fire and rotting is similarly no longer
a problem. However, very few floors are installed this way as steel forms are expensive and difficult to
install, particularly in odd shaped rooms.
We have omitted the use of lightweight fiberglas infill in all of our recommendations, because the
acoustical improvement is negligible as shown in paragraph 4 of the opening letter on page 2. When
water is present between floors, the breakdown of the lightweight fiberglas tends to clog drains and to
hold and carry moisture up to the plywood. This accelerates rotting whether the drains are introduced
in the sub-floor or not.
The jack-up system is easier to install since there is no need to fit unusual contours. The mountings
are placed in position along the edges and the concrete flows to or around the odd shapes. Any air gap
up to 4” can be used at no increase in cost. Perhaps the most important point is that there is no possibility of short circuiting of the air gap by concrete spills between plywood panels. When these accidents happen, there is no way to tell until the floor does not perform properly. In effecting repairs you
must first locate the short circuit, break or cut out that area of the floor, somehow re-establish the reinforcing by welding or tying to the stubs that are left and then repouring the patch. This can never happen with a lift-slab system as the floors are lifted after the concrete has hardened so the air gap must
be clear.
HOUSEKEEPING PAD
ON FLOATING FLOOR
When using the jack-up system, the isolator is within the cast iron housing, so the thickness of the isolator remains 2”, even if the floor is only elevated 1”. If you try to save height with a plywood system,
the thickness of the isolator must be reduced with a loss in efficiency because the isolator frequency
increases. We have installed floors that are 3” thick with a 1” lift for a total height of 4”. A plywood system with the same isolator frequency would have to be 51/2” high minimum. The 11/2” height saving
can be important.
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While we prefer the lift-slab system, we have also included specifications using plywood forms as there
is the occasional application where the forms are practical or for reasons of your own you prefer this
older technique.
EXTREME TRANSIENT LOAD CONDITIONS
Floating floors are sometimes subject to extremely high
transient loads that would deflect the floor beyond structural limits and result in floor failure. Typical of these are
stage floors, floating streets, convention exhibit centers
and major production TV studios. Temporary loadings
are buses, trailer trucks or lift trucks with concentrated
loads as high as 10,000 lbs. in any location. These problems are handled with stop screw isolator designs. The
main adjustment bolt is enlarged to a threaded brass
bushing with a centered steel bolt set to a predetermined clearance above a secondary base isolation plate
and isolation pad. Let us discuss these specialized
applications with you as each problem is different.
SEISMIC CONSIDERATIONS
LIFTING
BUSHING
STOP
SCREW
LDS
PRIMARY
ISOLATOR
CONCENTRATED
LOAD TESTS
STOP
SCREW
CLEARANCE
STRUCTURAL SLAB
LDS OVERLOAD PAD
STOP SCREW FSN
Also available for FS (spring)
In seismic zones the peripheral walls or curbs must be studied and designed to withstand horizontal
floating floor displacement at the maximum acceleration in the area. Typically a 5,000 square foot floor
would weigh 250,000 Lbs. and the weight of any equipment attached to the floor would have to be
added to that. If the system were in a 0.5g zone, the lateral force would be 125,000 Lbs. Assuming the
dimensions were 50 ft. x 100 ft., the 50 ft direction would be most critical and the curb or perimeter wall
designed to resist 2500 Lbs. per linear foot.
UNIFORM
LOAD TEST
Another potentially serious problem is the curling and failure of the concrete floor from the forces introduced by the machinery restraints that must be anchored to the floating floor. The problem becomes
apparent when you visualize a tall, narrow chiller. Acceleration at the center of gravity creates an overturning moment that pulls on the floor on one side and depresses it on the other. A 4” concrete floor
has little inherent resistance to this type of bending and we have addressed this problem with a double acting resilient floor snubber type SFFS as illustrated on page 8 and 14.
The snubber is anchored to the sub-floor and the housing cast into the floating floor. The up and down
clearances are adjusted after the floor has been raised. The floor restraints are grouped near the points
of tension and compression or on either side of the housekeeping pads. The inclusion of these snubbers keeps the floor captive and prevents damage. The generous clearances prevent short circuiting.
We believe we are the first, if not the only company, to offer this engineering development.
DEFORMED
METALLIC FORMS
5
IMPROVED PERFORMANCE BY REPLACING NEOPRENE
WITH LDS (Low Dynamic Stiffness) RUBBER
Business Card
We started Mason Industries
in 1958. Our revolutionary
Logo
designs of high deflection free standing spring isolators, as
opposed to housed mountings, and our literature with down to
earth information made its mark. This generated phone calls
from acoustical consultants asking us to get into the floating
floor business. We asked why. In addition to wanting more than
one source, the implication was that some competitive information was unreliable and they would rather work with us.
much more sophisticated. It is a forced frequency test for resonance at specific frequencies of 5, 10 and 15 Hz. We were
dismayed to find that rather than 1.5 to 1.63, the new results
ranged from an average of 1.8 for 54 durometer to 2.4 for 64.
Using the same test techniques, our new LDS rubber
compounds are below 1.3 in 50 durometer and 1.35 in 60.
This meant the continued use of Neoprene represented too
great a sacrifice in performance.
In those wonderful days we were doubling our volume every
year and keeping up with demand and continued development
of our mechanical systems, led us to answer, we simply were
not ready to enter the floating floor market.
LDS stands for Low Dynamic Stiffness. In addition to exceeding all AASHO Bridge Bearing structural requirements, we had
worked for years to develop compounds with extremely Low
Dynamic Stiffness characteristics even in 60 and 70 durometer as published. Using these compounds lowers frequency
response for a given deflection to improve both vibration isolation and reduce sound transmission. Other than oil resistance,
Mason LDS compounds are far superior to Neoprene in physical characteristics as well. Building Support Pads can have a
lower profile than Neoprene for the same frequency. This is
true of floating floor mounts too, but mounting heights are often
maintained to achieve a specified air gap.
In 1965 one of our representatives ordered Bridge Bearing
Neoprene Pads. While we had been molding rubber for years,
we were not familiar with this specification.
DuPont manufactures Neoprene, and they were a great help.
In addition to the Bridge Bearing formulations, they provided
publications and back up information on Neoprene’s excellent
aging characteristics.
After this exposure to Neoprene, we realized we had a proper
floating floor material. If Neoprene could survive in outdoor
applications, exposed to sunlight, temperature extremes, snow
and rain, it would certainly last for the life of the structure when
located in the dark, cozy, moderate temperature environment,
under a floating floor. We immediately phoned the acoustical
consultants, and asked what frequency they needed
We were told they wanted an isolation frequency of 8 Hz in a
2” air gap. Since the lowest audible frequency is 25 Hz. 25/8
provided an acoustical ratio of 3/1, similar to minimum vibration isolation, and at the higher frequencies, sound loss would
improve dramatically.
We learned that rubber materials are often deflected 10% of
the rubber thickness, and many publications refer to 15%
deformation as a good conservative compression limit. That is
why our 2” thick isolators have published deflections of 0.2”
and a maximum of 0.3”.
Dynamic Stiffness is simply defined as the ratio between the
spring rate in vibratory motion and the static spring rate.
When working with steel springs, the ratio is 1, as spring steel
is a completely resilient material. Rubber materials are quite
different. Dynamic stiffness increases with hardness and in
broad terms, the filler ratio of the materials to the rubber content as well as the type of carbon black reinforcement, plasticizers, etc. It is also very sensitive to the polymer.
We ran our Kodaris Neoprene Dynamic Stiffness test in 1972.
The corrected data showed that at 0.2” deflection, the poorest
situation using 60 duro with a dynamic stiffness of 1.63
increased the frequency to 9 Hz at 0.2” and 7.3 Hz at 0.3” as
compared to a steel spring where 0.2” deflection would be 7 Hz
and 0.3” 5.7 Hz.
In negotiating a recent building support project, we convinced
the client that Neoprene should be used in place of Natural
Rubber. We were not concerned that the specification required
a new dynamic stiffness test, because we believed the Kodaris
test data showing our 50 durometer Neoprene compound had
a dynamic stiffness of 1.50 and 60 durometer 1.63. However,
the dynamic stiffness tests run today are very different, and
In Europe, virtually all isolation work was and is done with
Natural Rubber. In this country, specifications for bridge
bearing rubber supports allow the use of Neoprene or Natural
Rubber. The very great majority of bearings, if not all, are
Natural Rubber. However, there is no requirement for a
low dynamic stiffness, so the compounds are made less expensive by using more fillers and are considerably less
efficient than our designs acoustically. In supporting bridges,
this is unimportant as bearings are used in shear to accommodate expansion and contraction and not for vibration isolation.
There is a mechanical aspect too. Most engineers and
architects are in the habit of pouring concrete on forms with
the bearings directly underneath or erecting steel directly on
the bearings. In this first stage, the loadings are very low so
the bearings hardly deflect. As the building progresses, the
bearings deflect in response to the added weight, which is not
always uniform. The more deflection required to achieve a frequency, the greater the complication of uneven deflections that
may distort the structure or induce cracks. LDS compounds
minimize that problem, because deflections are minimal for the
same frequency.
The use of Natural Rubber has been guided by the Malaysian
Rubber Institute, and just as DuPont has been promoting
Neoprene and other excellent special purpose polymers, the
Natural Rubber industry has been working with the chemical
people to perfect the antiozonants and antioxidants. Other
additives reduce sunlight damage. The new Natural Rubber
materials have become completely reliable in long term aging
tests, so there is no longer any reason to continue with the
Neoprene. We have always improved our offerings, and hopefully, our learning curve will continue.
Based on these conclusions, all acoustical isolation materials,
including the mounts used in Jack-up systems, the EAFM
series, or bearings to support and isolate structures will be
made of LDS materials. (Low Dynamic Stiffness.) Hanger
elements and hanger cups are included as well.
While the danger of oil contamination is minimal, all floor
mounted pads under spring isolators, spring holders, etc., will
continue as commercial grade Neoprene.
Norm Mason
6
MECHANICAL EQUIPMENT ROOM LDS JACK-UP SYSTEM
beginning of specifications
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Business Card
Logo
POLYETHYLENE
SHEETING
REINFORCING
FLOATING FLOOR
CONSTRUCTION
SEQUENCE
FSN
CASTINGS
ISO
LAT
ION
PLACEMENT
OF ISOLATION
MATERIALS
STRUCTURAL
FLOOR
ISOLATED
FLOOR DRAIN
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POURED
CONCRETE
CAULK
ISOLATOR
RUBBER PLUGS
POURING OF
CONCRETE
METER
CAULKED PERI D
AR
BO
N
IO
AT
ISOL
GROUT TOPS
OF ISOLATORS
EQUIPMENT
HOUSEKEEPING PAD
(must be mechanically
secured to floating floor
in seismic zones.)
JACKED UP
FLOATING
FLOOR
SPECIFIED
AIR GAP
The following floor specifications are all written in the format of the
“United States Construction Specifications Institute”. All specifications are available upon request on CD Rom.
LDS JACK-UP SYSTEM FOR MECHANICAL EQUIPMENT ROOMS
WITH MACHINERY SUPPORTED BY THE FLOATING FLOOR.
Type CFDA4 x 4
FLOOR DRAIN
PART 1 - GENERAL
Download This Specification
1.01 Description
A Scope of Work
Download All Product Details
1. Isolate floating floors from building structure by means of jack-up
LDS isolators and perimeter isolation in each of the mechanical
equipment rooms as shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the prod-
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Type FSN
LDS JACK-UP MOUNT
7
MECHANICAL EQUIPMENT ROOM LDS JACK-UP SYSTEM
specification continued
Business
CardSpecifications. Submit samples and
ucts which are listed
in these
test reports by an independent
laboratory for consideration on this
Logo
project.
1.02 Design
A. Intent
1. The floating floor system shall consist of a 4”(100mm) thick concrete slab isolated from and supported 2”(50mm) above the waterproofed structural slab by resilient LDS isolators within cast iron
housings designed to jack up the floor after pouring on the sub-floor.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor with a 31/2” air gap to the structural walls. (31/2”(90mm) may be reduced to 2”(50mm) if no sway
braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls,
columns and curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment within these rooms shall be mounted on housekeeping pads or directly on the floating floor as shown on the drawings.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the floor shall be protected by embedded double acting resilient floor snubbers set in
opposition to the overturning moments at the equipment snubbers
in all locations where the center of gravity of major equipment is
high.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials and raising of the floor shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation or
bolt to the sub-floor.
4. Cover entire floor area with 6 mil (0.15mm) plastic sheeting and
carry sheeting up perimeter isolation.
5. Place bell-shaped castings on a maximum of 54”(1370mm) centers
in the general areas in strict accordance with the approved drawings prepared by the isolation manufacturer. Spacing can be
increased to straddle machinery locations. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
5a. In seismic zones attach double acting resilient seismic snubbers to
the structural slab on either side of high center of gravity equipment
to withstand the overturning moment generated by the machinery
snubbers and prevent failure of the floating floor.
6. Place reinforcing as shown on the drawings and pour floor monolithically.
7. Raise floor 2”(50mm) by means of the jack-screws. (If construction
sequence dictates raising the floor before placing machinery, heavy
planking must be used to protect floor while machinery is being
rolled into position).
8. Caulk perimeter isolation in all locations and grout jack-screw holes.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces and
isolated angle iron wall braces at the top of the walls. Caulk angle
iron braces.
8
10. In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
D. Submittals
1. Detailed product drawings and Load/Deflection curves of all isolators, double acting floor snubbers and/or other snubbing restraints
when required.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete floating floor, a 6”(152mm) structural floor and a 2”(50mm) air
gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections, frequencies and locations and in seismic zones, locations of seismic snubbers.
If sound barrier walls are used, add the following to b:
Wall sway brace and isolated angle iron brace sizes, locations
and frequencies.
c. Any drain and penetration locations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floor or floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials shall be installed and the floor
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating floor or special provisions made for isolator housings of different height.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
2.01 Isolators
A. Bell shaped castings with integral lugs to locate reinforcing, shrouding 2”(50mm) thick LDS isolators molded to the following and all
other AASHTO bridge bearing specifications. All housings shall
have 3/4”(20mm) minimum diameter jackscrews. Deflections shall
not exceed 0.3”(7.5mm) nor the frequency 9 Hz. Isolators shall be
Mason Industries type FSN.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of clearances in both the up and down
directions of the resilient stops. Resilient stops shall be attached to
a restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
MECHANICAL EQUIPMENT ROOM LDS JACK-UP SYSTEM
specification concluded
Business
Card
If sound barrier walls are
used, add
the following:
Logo
C. Wall Sway Braces: Double
acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
D. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets
shall be Mason Industries AB-716.
surrounding the upper section as a between floors sound seal.
Weep holes are required to drain the structural floor. Floor drains
shall have water proofing membrane clamps. Floor drains shall be
Mason Industries Type CFD-18591.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
The following table is a general guide to floor thicknesses and air
gaps. All specifications may be modified to your requirements.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the FSN mountings and
sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
TYPICAL FLOOR CONFIGURATIONS
Floor
Thickness
Air Gap
Overall
Height
3"– Minimum
Most
Common
2"
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
Occasionally
3" or 4"
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating
floor. Lower bucket, built into the structure, shall retain water
4"– Most Common
5"– Seldom
Air Gap
Plus
Floor
Thickness
6"– Common
Thicker Floors or
Fractional Dimensions
As Required. We
have Designed Floating
Floors 12” Thick.
PRODUCT DETAILS
EAFM LDS Mount
FSN LDS Jack-Up Mount
MOUNT
PRIOR TO
POURING
C
A
C
A B
FS Spring Jack-Up Mount
A
Capacity and
deflections are
controlled by
diameter and
durometer.
B
1”
MOUNT IN
RAISED
POSITION
Load Range
(lbs)
A
(in)
45/8
53/8
Typical Sizes
Load
Range
(lbs)
B
(in)
51/2
61/4
Min C
(in)
Max C
(in)
500 to 1700
3 As Reqd
2800 to 3500
3 As Reqd
Dynamic Frequency not to exceed 7.5 Hertz
@ 0.3” Deflection. (60 Duro)
P7 PVC Foam
A
(in)
B
(in)
1/2
Max
Defl
0.15T
(in)
1-3
0.08 15.0
25 - 3500
1-4
1
0.15 11.0
lbs. per 1.5-4.75 11/2 0.23 9.0
mount
2-5
2
0.30 7.5
as req’d 3-4.75 3
0.45 6.0
4-5
4
0.60 5.5
Larger sizes can be molded as required or
mountings clustered for greater capacity.
CFD
Average Density: 7 lbs/cubic foot
Floor
Drain
SFFS
8 3/4”
3/4”
Nominal
Thickness
Available in
Lengths from
4’ to 20’
Floor
Thickness
+ Air Gap
Fits 2”, 21/2”, 3” &
4” Threaded Pipe
Load
Range
(lbs)
Defl
(in)
A
(in)
Min
B
(in)
450 to 1000
1000 to 2935
450 to 680
610 to 1870
1
1
2
2
4
5
4
5
4
4
4
4
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Seismic
Floating
Floor
Snubber
PVC
Height as
Required
B
Lowest
Dynamic
Freq (Hz)
60 Duro
Clearance fills
with water to
form sound trap
SAB
Anchor
9
TV STUDIOS, THEATRES, etc. LDS JACK-UP SYSTEM
beginning of specification
Business Card
TYPICAL FLOOR WITHOUT MACHINERY
Logo
LDS JACK-UP SYSTEM FOR TV Studios, Theatres, Bowling Alleys,
Kitchens, Squash Courts, Exercise Rooms, etc.
PART 1 - GENERAL
Download This Specification
Download All Product Details
1.01 Description
We have left the blank below for you to fill in the name of the area, i.e.
Auditorium, TV Studio, etc. Please specify floor finish such as hardwood
or tile as you normally do in another section.
A. Scope of Work
1. Isolate floating floors from building structure by means of jack-up
LDS isolators and perimeter isolation in each of the (fill in name of
area) _____________________.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
10
1.02 Design
A. Intent
1. The floating floor system shall consist of a 4”(100mm) thick concrete slab isolated from and supported 2”(50mm) above the structural slab by resilient LDS isolators within cast iron housings
designed to jack up the floor after pouring on the sub-floor. Sub
floors shall be waterproofed under kitchens.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor with a 31/2”(90mm) air gap to the
structural walls. (31/2”(90mm) may be reduced to 2”(50mm) if no
sway braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls,
columns and curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials and raising of the floor shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Cover entire floor area with 6 mil (0.15mm) plastic sheeting and
carry sheeting up perimeter isolation.
5. Place bell-shaped castings on maximum 54”(1370mm) centers in
the general areas in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
6. Place reinforcing as shown on the drawings and pour floor monolithically.
7. Raise floor 2”(50mm) by means of the jack-screws.
8. Caulk perimeter isolation in all locations and grout jack-screw
holes.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces
and isolated angle iron wall braces at the top of the walls. Caulk
angle iron braces.
D. Submittals
1. Detailed product drawings and Load/Deflection curves of all isolators.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete
floating floor, a 6”(150mm) structural floor and a 2”(50mm) air gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections, frequencies and locations.
If sound barrier walls are used, add:
wall sway brace and isolated angle iron brace sizes, locations
and frequencies.
c. Any drains or other penetrations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f. Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred similar installations.
B. The floating floor isolation materials shall be installed and the floor
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating floor or special provisions made for isolator housings of different height.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
2.01 Isolators
A. Bell shaped castings with integral lugs to locate reinforcing, shrouding 2”(50mm) thick LDS isolators molded to the following AASHTO
bridge bearing specifications. All housings shall have 3/4”(20mm)
minimum diameter jackscrews. Deflections shall not exceed
0.3”(7.5mm) nor the frequency 10Hz. Isolators shall be Mason
Industries type FSN.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
If sound barrier walls are used, add the following:
B. Wall Sway Braces: Double acting LDS sway braces with a fail
safe feature in three planes. Braces shall be furnished with a bracket for bolting to the structural wall and a hooked end for insertion in
the masonry joint. Braces shall have a frequency not
TV STUDIOS, THEATRES, etc. LDS JACK-UP SYSTEM specification concluded
LDS JACK-UP SYSTEM for ROOFS beginning of specification
Business
Card
in excess
of 10Hz
based on the weight of the wall area per brace and a
vertical stiffness
Logo not in excess of 50% of the horizontal. Sway braces
shall be Mason Industries Type DNSB.
C. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets shall
be Mason Industries AB-716.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average. PVC
foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the FSN mountings and
sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating floor.
Lower bucket, built into the structure, shall retain water surrounding
the upper section as a between floors sound seal. Weep holes are
required to drain the structural floor. Floor drains shall have water
proofing membrane clamps. Floor drains shall be Mason Industries
Type CFD-18591.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
––––––––––––––––––– End of Specification ––––––––––––––––––
LDS JACK-UP SYSTEM FOR ROOFS.
PART 1 - GENERAL
Download This Specification
1.01 Description
A. Scope of Work
Download All Product Details
1. Isolate floating roofs from the building structure by means of jack-up
LDS isolators and perimeter isolation in each of the roof areas
shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products
which are listed in these Specifications. Submit samples and test
reports by an independent laboratory for consideration on this project.
1.02 Design
A. Intent
1. The floating roof system shall consist of a 4”(100mm) waterproofed
concrete slab isolated and supported 2”(50mm) above the waterproofed structural slab by resilient LDS isolators within cast iron
housings designed to jack up the roof after pouring on the sub-roof.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor.
2. The floating roof slab shall be isolated from adjoining walls, columns,
and curbs by means of perimeter isolation.
3. Any equipment mounted directly on the floating roof shall be
installed so as not to damage the roof’s waterproofing.
4. Flashing and waterproofing shall be completed after the roof is
raised. Perimeter flashing shall allow for downward movement of
0.5”(12mm).
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the roof shall be protected by embedded double acting resilient floor snubbers set in opposition to the overturning moments at the equipment snubbers in all locations where the center of gravity of major equipment is high.
B. Performance Requirements
1. The floating roof system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Roof System Construction Procedure
1. The setting of all isolation materials and raising of the roof shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Cover entire floor area with 6 mil (0.15mm) plastic sheeting and
carry sheeting up perimeter isolation.
5. Place bell-shaped castings on maximum 54”(1370mm) centers in
the general areas in strict accordance with the approved drawings
prepared by the isolation manufacturer. Spacing can be increased
to straddle machinery locations. Additional reinforcement must be
detailed on isolation manufacturer’s drawings when required.
If sound barrier walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating roof.
5a. In seismic zones attach double acting resilient seismic snubbers to
the structural slab on either side of high center of gravity equipment
to withstand the overturning moment generated by the machinery
snubbers and prevent failure of the floating roof.
6. Place reinforcing as shown on the drawings and pour roof monolithically.
7. Raise roof 2”(50mm) by means of the jack-screws. (If constructions
sequence dictates raising the roof before placing machinery, heavy
planking must be used to protect the roof if machinery is rolled into
position).
8. Caulk perimeter isolation in all locations and grout jack-screw holes.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces
and isolated angle iron wall braces at the top of the walls. Caulk
angle iron braces.
10. In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
11. Install waterproofing and flashing.
D. Submittals
1. Detailed product drawings and Load/Deflection curves of all isolators and in seismic zones double acting floor snubbers.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete floating floor, a 6”(150mm) structural floor and a 2”(50mm) air
gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections, frequencies and locations and in
seismic zones, locations of seismic snubbers.
c. Any drains or other penetrations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f. Roof system construction procedure.
11
LDS JACK-UP SYSTEM for ROOFS specification concluded
SPRING JACK-UP SYSTEM beginning of specification
1.03 Quality Assurance
Business Card
A. Floating roof system components
shall be designed and fabricated
Logo
by a manufacturer with at least ten years experience in one hundred
similar floor or roof installations.
TYPICAL SPRING CROSS SECTION
B. The floating roof isolation materials shall be installed and the roof
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating roof, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-roof must have the same pitch as the
top of the floating roof or special provisions made for isolator housings of different height.
Key for Spanner Wrench
Cover
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
Ferrous
Housing
Cast into
Floor
System
PART 2 - PRODUCTS
2.01 Isolators
A. Bell shaped castings with integral lugs to locate reinforcing, shrouding 2”(50mm) thick LDS isolators molded to the following AASHTO
bridge bearing specifications. All housings shall have 3/4”(20mm)
minimum diameter jackscrews. Deflections shall not exceed
0.3”(7.5mm) nor the frequency 10Hz. Isolator shall be Mason
Industries type FSN.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of clearances in both the up and down
directions of the resilient stops. Resilient stops shall be attached to
a restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the FSN mountings and
sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Roof Drains
A. Use standard roof drains cast into the floating roof. The structural
floor shall have openings large enough to access pipe connections
to the drains. Drain piping shall be suspended from combination
spring and LDS hangers with a minimum of 1”(25mm) static deflection for 40 feet(12 meters) from the attachment point as shown on
the drawings.
B. Roof drains shall be (Architects Preference)
PART 3 - EXECUTION
3.01 Installation
12
Install the floating roof systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
Steel
Washer
Type FS
SPRING
JACK-UP
MOUNT
RIS Replaceable
Element Interchangeable
with Spring Assembly
Type RIS
RUBBER-IN-SHEAR
FLOOR DAMPER
Subpad
RIS Seat Centers RIS
Element. Bonded Steel
Washer Distributes Load
on Subpad and Reduces
Turning Friction
The damping provided by the air under spring supported floors is normally adequate to limit motion. Occasionally, particularly in small
aerobic rooms, rhythmic exercises amplify floor motion so additional
damping is desirable. The RIS (rubber-in-shear) element solves this
problem. Elements are interchangeable with FS springs and can be
installed in existing housings if needed or included in the design stage
in supplementary locations. Damping rate is controlled by hardness,
material and number of dampers.
SPRING JACK-UP SYSTEM FOR TV STUDIOS, THEATRES, BOWLING ALLEYS, KITCHENS, SQUASH COURTS, EXERCISE ROOMS,
ETC.
PART 1 - GENERAL
Download This Spec
1.01 Description
Download All Product Details
A. Scope of Work
1. Isolate floating floors from the building structure by means of jackup spring isolators and perimeter isolation in each of the
______________ rooms as shown on the drawings. (Architect to fill
in name of room.)
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples for
consideration on this project.
1.02 Design
A. Intent
1. The floating floor system shall consist of a 4”(100mm) thick concrete slab isolated from and supported 2”(50mm) above the structural slab by resilient spring isolators within cast iron housings
designed to jack up the floor after pouring on the sub-floor.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction may be changed by the architect when
writing specification) shall rest on the floating floor with a
31/2”(90mm) air gap to the structural walls. (3”(90mm) may be
reduced to 2”(50mm) if no sway braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
SPRING JACK-UP SYSTEM specification concluded
Business
Card
3. Any floor drains, piping,
conduit
and duct penetrations must not
short circuit the isolation system.
Logo
4. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
If sound barrier walls are used, add the following:
2.01 Isolators
A. Casting or weldments consisting of an internally threaded outer housing complete with lugs to support the reinforcing system. The inner
inverted cup shaped housing shall be externally threaded. The
springs are compressed and the floor lifted by turns of the internal
housing. Springs shall be seated in neoprene cups and housings
shall have removable cover plates. Spring diameters shall be no less
than 0.8 of the compressed height of the spring at rated load. Springs
shall have a minimum additional travel to solid equal to 50% of the
rated deflection. Spring deflections shall be a minimum of
0.75”(20mm). (Note to architect: Deflections may be changed as
required.) Isolators shall be Mason Industries Type FS.
If sound barrier walls are used, add the following:
B. Wall Sway Braces: Double acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
C. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets
shall be Mason Industries Type AB-716.
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
B. Performance Requirements
1. All spring isolators shall have the minimum specified deflection.
C. Floor System Construction Procedure
1. The setting of all isolation materials and raising of the floor shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Cover entire floor area with 6 mil (0.15mm) polyethylene sheeting
and carry sheeting up perimeter isolation.
5. Place spring isolator castings on a maximum of 54”(1370mm) centers in the general areas in strict accordance with the approved
drawings prepared by the isolation manufacturer. Additional reinforcement such as in wall locations must be detailed on isolation
manufacturer’s drawings when required.
6. Place reinforcing as shown on the drawings and pour floor monolithically.
7. Raise floor 2”(50mm) by means of the isolator threaded sleeves
and replace covers.
8. Caulk perimeter isolation in all locations.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Readjust perimeter isolators as required to compensate for wall weight as the wall is built.
Provide sway braces and isolated angle iron wall braces at the top
of the walls. Caulk angle iron braces.
D. Submittals
1. Detailed product drawings including Load/Deflection curves of all
isolators.
2. Drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections and locations.
If sound barrier walls are used, add the following to b:
Wall sway brace and isolated angle iron brace locations.
c. Any drain and penetration locations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials shall be installed and the floor
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating floor or special provisions made for isolator housings of different height.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to
AASHTO specifications, as shown and sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed
pads shall be Mason Industries Type LDS-BBP.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating
floor. Lower bucket, built into the structure, shall retain water surrounding the upper section as a between floors sound seal. Weep
holes are required to drain the structural floor. Floor drains shall
have water proofing membrane clamps. Floor drains shall be
Mason Industries Type CFD-18591.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
Note to Architect: When theatres have sharply sloped floors, FSN or FS
mountings must be furnished with round cast iron or neoprene wedges
at each FSN or FS location so mountings are installed level. In extreme
cases a restraining curb is needed at the base of the slope or the end of
the straight section adjoining the slope.
13
MECHANICAL EQUIPMENT ROOM LDS FORM-WORK SYSTEM
beginning of specification
Business Card
Logo
METER
CAULKED PERI D
ISOLATION BOAR
HOUSEKEEPING
PAD
REINFORCING
POL
SH YETH
EE YLE
TIN NE
G
PL
WOYOD
EAFM
FLOATING
FLOOR
ISO
LAT
ION
AIR
GAP
EAFM LDS
MOUNTS
FLOOR
DRAIN
Type CFDA4 x 4
FLOOR DRAIN
Type EAFM
LDS FLOOR MOUNT
LDS FORM-WORK SYSTEM FOR MECHANICAL EQUIPMENT
ROOMS WITH MACHINERY SUPPORTED BY THE FLOATING
FLOOR.
PART 1 - GENERAL
1.01 Description
A. Scope of Work
Download This Specification
Download All Product Details
1. Isolate floating floors from building structure by means of LDS
isolators under plywood panels and perimeter isolation in mechanical equipment rooms as shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
1.02 Design
A. Intent
1. The floating floor shall consist of a 4”(100mm) thick concrete slab
isolated from and supported 21/2”(62mm) above the waterproofed
structural slab by resilient LDS isolators covered by 1/2” (12mm)
plywood panels that form the pouring surface.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction may be changed by architect when writing
specification) shall rest on the floating floor with a 31/2”(90mm) air
gap to the structural walls. (31/2”(90mm) may be reduced to
2”(50mm) if no sway braces are needed.)
14
2. The floating floor slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment within these rooms shall be mounted on housekeeping pads or directly on the floating floor as shown on the drawings.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the floor shall be protected by embedded double acting resilient floor snubbers set in
opposition to the overturning moments at the equipment snubbers
in all locations where the center of gravity of major equipment is
high.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials shall be performed by or under
the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Place individual LDS isolators on the sub-floor at a maximum spacing of 24”(600mm) in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier isolation walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
5. In seismic zones provide anchorage for the double acting resilient
vertical snubbers to the structural slab. Snubber anchor bolts must
be in close proximity to the mechanical snubbers restraining any
high center of gravity equipment to withstand the overturning
moments generated by the machinery snubbers and prevent failure
of the floating floor.
6. Cover isolators with 1/2”(12mm) AC plywood. Isolators shall be
located under joints and joints staggered. Connect plywood at abutting edges and corners with 16 gauge steel junction plates.
7. Cover the plywood with 6 mil (0.15mm) plastic sheeting and carry it
up the walls past the perimeter isolation.
8. Place seismic snubber housings on the anchor bolts that protrude
from the structural floor and through the plywood.
9. Place reinforcing as shown on the drawings and pour floor monolithically.
MECHANICAL EQUIPMENT ROOM LDS FORM-WORK SYSTEM
specification concluded
Business
Card caulk all perimeter isolation.
10. After the concrete
has hardened,
11.
D.
1.
2.
If sound barrier wallsLogo
are used, add the following:
Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces and
isolated angle iron wall braces at the top of the walls. Caulk angle
iron braces.
In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
Submittals
Detailed product drawings and Load/Deflection curves of all isolators. In seismic zones details of double acting floor snubbers.
AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC-79 and a minimum INR+17 using a 4”(100mm) concrete
floating floor, a 6”(150mm) structural floor and 2”(50mm) air gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolators sizes, deflections, frequencies and locations. In seismic
zones add: “Locations and details of seismic snubbers”.
If sound barrier walls are used, add the following:
Wall sway brace and isolator, angle iron brace sizes, locations and
frequencies.
c. Any drain and penetration locations.
d. Size type elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials and panel board forms shall be
installed under the supervision of the isolator manufacturer.
restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
If sound barrier walls are used, add the following:
C. Wall Sway Braces: Double acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
D. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets
shall be Mason Industries Type AB-716.
2.02 Plywood Covering Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the EAFM mountings
and sized for a maximum deflection of 0.2”(5mm) at maximum
earthquake forces. Interspersed pads shall be Mason Industries
Type LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating
floor. Lower bucket, built into the structure, shall retain water surrounding the upper section as a between floors sound seal. Weep
holes are required to drain the structural floor. Floor drains shall
have water proofing membrane clamps. Floor drains shall be
Mason Industries Type CFD-18591.
2.06 Plywood
A. Type AC exterior grade 1/2”(12mm) thick.
PART 3 - EXECUTION
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation
manufacturer.
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
APPLICATION OF SEISMIC FLOATING FLOOR SNUBBERS
PART 2 - PRODUCTS
2.01 Isolators
CONDENSER
A. Cylindrical LDS mountings with a diameter no less than 0.9 of the
2”(50mm) height. Isolators are molded to the following LDS AASHTO bridge bearing specification. Maximum durometer 60.
Deflections shall not exceed 0.3”(7.5mm) nor the frequency 10Hz.
Isolators shall be Mason Industries Type EAFM.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of resilient stop clearances in both the up
and down directions. Resilient stops shall be attached to a
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SEISMIC
SNUBBER
SFFS
FLOATING
FLOOR
SNUBBER
SNUBBER SHOWN WITH EAFM PANEL SYSTEM
Equally suitable for FSN Jack-Up Floors
15
TV STUDIOS, THEATRES, etc. LDS FORM-WORK SYSTEM
beginning of specification
Business Card
TYPICAL SLOPED THEATRE FLOOR
Logo
5. Cover isolators with 1/2”(12mm) AC plywood. Isolators shall be
located under joints and joints staggered. Connect plywood at abutting edges with plywood junction plates.
6. Cover the plywood with polyethylene sheeting and carry it up the
walls past the perimeter isolation.
7. Place reinforcing as shown on the drawings and pour floor monolithically.
LDS FORM-WORK SYSTEM FOR TV STUDIOS, THEATRES, BOWLING ALLEYS, KITCHEN, SQUASH COURTS, EXERCISE ROOMS,
ETC.
PART 1 - GENERAL
Download This Specification
Download All Product Details
1.01 Description
A. Scope of Work
1. Isolate floating floors from building structure by means of LDS
isolators under plywood panels and perimeter isolation in mechanical equipment rooms as shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
1.02 Design
A. Intent
1. The floating floor shall consist of a 4”(100mm) thick concrete slab
isolated from and supported 21/2”(62mm) above the waterproofed
structural slab by resilient LDS isolators covered by plywood
panels that form the pouring surface.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6” (150mm) filled concrete block
(Barrier wall construction may be changed by architect when writing
specification) shall rest on the floating floor with a 31/2”(90mm) air
gap to the structural walls. (31/2”(90mm) may be reduced to
2”(50mm) if no sway braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment within these rooms shall be mounted on housekeeping pads or directly on the floating floor as shown on the drawings.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials shall be performed by or under
the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Place individual LDS isolators on the sub-floor at a maximum spacing of 24” (600mm) in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier isolation walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
16
8. After the concrete has hardened, caulk all perimeter isolation.
If sound barrier walls are used, add 9.
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces
and isolated angle iron wall braces at the top of the walls. Caulk
angle iron braces.
D. Submittals
1. Detailed product drawings and load /deflection curves of all isolators.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC-79 and a minimum INR+17 using a 4”(100mm) concrete
floating floor, a 6”(150mm) structural floor and 2”(50mm) air gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolators sizes, deflections, frequencies and locations.
If sound barrier walls are used, add the following:
Wall sway brace and isolator, angle iron brace sizes, locations
and frequencies.
c. Any drain and penetration locations.
d. Size type elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials and panel board forms shall be
installed under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
2.01 Isolators
A. Cylindrical LDS mountings with a diameter no less than 0.9 of the
2”(50mm) height. Isolators are molded to the following LDS AASHTO bridge bearing specification. Maximum durometer 60.
Deflections shall not exceed 0.3”(7.5mm) nor the frequency 10Hz.
Isolators shall be Mason Industries Type EAFM.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
TV STUDIOS, THEATRES, etc. LDS FORM-WORK SYSTEM specification concluded
LDS FORM-WORK SYSTEM for ROOFS beginning of specification
Card
If soundBusiness
barrier walls
are used, add the following:
Logo
B. Wall Sway
Braces: Double acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
C. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets shall
be Mason Industries Type AB-716.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average. PVC
foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the EAFM mountings
and sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating floor.
Lower bucket, built into the structure, shall retain water surrounding
the upper section as a between floors sound seal. Weep holes are
required to drain the structural floor. Floor drains shall have water
proofing membrane clamps. Floor drains shall be Mason Industries
Type CFD-18591.
2.06 Plywood
A. Type AC exterior grade 1/2”(12mm) thick.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
––––––––––––––––––– End of Specification ––––––––––––––––––
2. The floating roof slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment on the roof shall be mounted on housekeeping pads
or directly on the floating roofs as shown on the drawings, and
installed so as not to damage the roof’s waterproofing.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the floor shall be protected by embedded double acting resilient floor snubbers set in
opposition to the overturning moments at the equipment snubbers
in all locations where the center of gravity of major equipment is
high.
B. Performance Requirements
1. The floating roof system shall have a minimum rating of STC 79 and
INR+17 as verified by an independent laboratory in prior tests.
C. Roof System Construction Procedure
1. The setting of all isolation materials shall be performed by or under
the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Place individual LDS isolators on the sub-floor at a maximum spacing of 24”(600mm) in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier isolation walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating roof.
5. In seismic zones provide anchorage for the double acting resilient
vertical snubbers to the structural slab. Snubber anchor bolts must
be in close proximity to the mechanical snubbers restraining any
high center of gravity equipment to withstand the overturning
moments generated by the machinery snubbers and prevent failure
of the floating floor.
6. Cover isolators with 1/2”(12mm) AC plywood. Isolators shall be
located under joints and joints staggered. Connect plywood at abutting edges and corners with 16 gauge steel junction plates.
LDS FORM-WORK SYSTEM FOR ROOFS
7. Cover the plywood with polyethylene sheeting and carry it up the
walls past the perimeter isolation.
PART 1 - GENERAL
8. Place seismic snubber housings on anchor bolts that protrude from
the structural floor and through the plywood.
Download This Specification
1.01 Description
Download All Product Details
A. Scope of Work
1. Isolate floating roofs from the building structure by means of LDS
isolators under plywood panels and perimeter isolation as shown on
the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
1.02 Design
A. Intent
1. The floating roof shall consist of a 4”(100mm) thick concrete slab
isolated from and supported 21/2”(62mm) above the waterproof
structural slab by resilient LDS isolators covered by plywood panels
that form the pouring surface.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor.
9. Place reinforcing as shown on the drawings and pour floor monolithically.
10. After the concrete has hardened, caulk all perimeter isolation.
If sound barrier walls are used, add the following:
11. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls.
12. Perimeter roofing shall be done to allow for 0.5”(12mm) of downward movement without leakage.
13. In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
D. Submittals
1. Detailed product drawings and load /deflection curves of all isolators and in seismic zones double acting floor snubbers.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete floating floor, a 6”(150mm) structural floor and a 2”(50mm) air
gap.
17
LDS FORM-WORK SYSTEM for ROOFS specification concluded
Business
Cardshowing:
5. A drawing
or drawings
Logo
a. Dead, live and concentrated loads.
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
b. Isolator sizes, deflections, frequencies and locations and in
seismic zones, locations of seismic snubbers.
c. Any drain and penetration locations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f. Floating roof and wall construction procedure.
1.03 Quality Assurance
A. Floating roof system components shall be designed and fabricated
by a manufacturer of at least ten years experience in one hundred
similar floating floor installations.
B. The floating roof isolation materials and panel board forms shall be
installed under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating roof or special provisions made for isolator housings of different height.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
2.01 Isolators
A. Cylindrical LDS mountings with a diameter no less than 0.9 of the
2” (50mm) height. Isolators are molded to the following LDS AASHTO bridge bearing specification. Maximum durometer 60.
Deflections shall not exceed 0.3”(7.5mm) nor the frequency 10Hz.
Isolators shall be Mason Industries Type EAFM.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
2.02 Plywood Cover Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting over
the plywood.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the EAFM mountings
and sized for a maximum deflection of 0.2”(5mm) at maximum
earthquake forces. Interspersed pads shall be Mason Industries
Type LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Roof Drains
PART 2 - PRODUCTS
ORIGINAL PHYSICAL
PROPERTIES
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of clearances in both the up and down
directions of the resilient stops. Resilient stops shall be attached to
a restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
ROOFING TO
ALLOW FOR 0.5”
DOWNWARD
MOVEMENT
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
ARCHITECT’S
ROOF DRAIN
(Not by Mason)
A. Floating roof drains shall be selected by the architect. A hole large
enough to allow passage of the drain piping shall be left in the structural roof. Drain piping shall be suspended from combination spring
and LDS hangers with a minimum of 1”(25mm) static deflection for
40 feet (12 meters) from the attachment point as shown on the
drawings.
B. Floor drains shall be (Architects preference).
2.06 Plywood
A. Type AC exterior grade 1/2”(12mm) thick.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation procedures
and drawings submitted by the isolator manufacturer and approved by
the architect.
WATERPROOFING
FLOATING
ROOF
LDS
JACK-UP OR
EAFM ISOLATION
STRUCTURAL
FLOOR
CLEARANCE
HOLE IN
SUB-FLOOR
SPRING &
LDS
HANGERS
FSN JACK-UP OR EAFM PANEL SYSTEM USING STANDARD ROOF DRAIN
18
ISOLATED
DRAIN PIPE
SPRINISOLATED WALLS discussion
Walls are isolated to prevent flanking around floating floors or to improve the STC between adjacent spaces.
FLANKED FLOOR
FLOATING
FLOOR
SUPPORTED
WALL
The word “flanking” is used to describe a vibration or noise path that goes around an isolated
component. If a structure is built with continuous walls so that in cross section it is as an H and
we introduce a floating floor, the STC of the system will probably remain at only 60 or 63 regardless of the floor’s rating. Sound energy vibrates the walls and this vibration continues in wave
form to the lower spaces where the wall reintroduces the sound. This is flanking or bypassing
the floating floor. The difference in results is shown in Test Two as opposed to Test One in the
beginning of our discussion on page 3. The floor constructions were exactly the same. In Test
One, however, the sound impinged directly on the walls and ceiling without the isolated barrier
walls and ceiling used in Test Two.
To complete an envelope, secondary walls must be introduced with the same consideration
given to mass and air gap as covered in the floor discussion. The problem is simpler, because
the walls normally support only their own weight and they need not have the structural strength
of the floor. Poured concrete or concrete block walls should approach the floor density. It is most
important that block joints are properly filled with mortar and painting the walls so the construction is more nearly airtight helps.
The best approach is resting these walls on the perimeter of the floating floor so the floor isolation system serves the walls as well. If this is not possible, the second choice is supporting the
isolated wall on the structural slab with continuous neoprene pads, and providing a caulked fiberglas seal between the floating floor and the wall as described for the perimeter in the previous
specifications.
If the wall is so high as to be unstable it must be protected against buckling or toppling by means
of resilient sway braces anchored to the structural walls. Sway braces are mandatory for all independent walls resting on pads if they are not locked at the top. Braces are normally placed 4’
apart horizontally with the vertical spacing of rows dependent on the height and thickness of the
wall. It is seldom that more than two rows of braces are required.
Occasionally we have used double acting springs for sway braces in conjunction with spring
mounted floors. In most cases, however, our recommended design is the neoprene Type DNSB
as illustrated on page 20. When space is limited, the WIC clip is the logical alternate. (Page 20)
Yet another variation, Type WCL, consists of a channel shaped bracket that is lined with 5/16”
neoprene waffle pad and a 1/4” thick felt backing. With this arrangement the bracket is bolted to
the structural wall so that horizontal steel furring can be laid in the isolated pocket as illustrated.
(Page 20)
STRUCTURAL
FLOOR
SUPPORTED
WALL
When we did our test work at Riverbank, we did not place lightweight fiberglas fill between the
walls of our inner room and the walls of the laboratory. Concrete short circuited the air gap and
we had to break it out. Therefore, under Construction Procedure you will find that we have said
that “special care must be taken to completely butter all joints and concrete must not be allowed
to drop behind the wall and short circuit the air gap”.
If you wish to be more cautious about concrete droppings, you can call for 1 1/2” or 2” thick three
pound minimum density fiberglas to fill this vertical void. Call for the fiberglas in the materials
portion of the specification and then in the construction procedure advise the contractor to
cement the fiberglas to the structural wall in advance of the placing of the concrete blocks. Thus,
the fiberglas will serve to prevent accidental short circuiting of the air gap. It is primarily a
mechanical rather than an acoustical aid.
TYPICAL LIGHTWEIGHT
WALL BRACE AND SUPPORT
Test Three
BROADCASTING STUDIO
Frequency
(Hz)
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
FSTC
INR
Transmission
Loss (dB)
47
48
50
54
60
66
71
79
85
90
95
92
92
71
+24
Cerami Field Test 2501, July 1, 1974
We must also be concerned with sound leakage over the top of the wall. If a wall is short and
rigid and need not be locked at the top, the least expensive approach is the inclusion of a fiberglas pad over the last course of masonry with acoustical caulking on both sides of the pad. In
most cases, it is easier to both lock the walls in place and seal them by the use of continuous
angle brackets type AB-716 which are placed on both sides of the wall as illustrated on page 20.
If the walls are stable and it is possible to rest the floating ceiling on the floating walls to complete the box, there is no need for these top details.
When an isolated wall abuts the rigid structure, it is usual to place a fully caulked strip of fiberglas or 1/2” neoprene sponge at the end to prevent short circuiting. AB-716 angle braces can be
used vertically as well for locking purposes or a caulked vertical section of channel iron lined with
1/2” neoprene sponge makes another neat joint as the wall fits between the flanges.
If some lesser STC values are satisfactory, it is not necessary to use masonry. Good results can
be obtained with gypsum board walls or various of the prefabricated acoustical partitions as
shown by Test Three of a small broadcasting studio using a 4” jack-up concrete floor, gypsum
board walls on three sides and an isolated ceiling. You will note that rather than the 79 STC
obtained with the 2” air gap in the Riverbank Test, this room came in at FSTC 71 with an INR of
plus 24. These are excellent results and probably more than satisfactory for most situations. This
less expensive construction should certainly be considered. The type WCL clip was used to
resiliently support horizontal runners and we had included fiberglas behind the walls as always
for lightweight construction.
Isolated walls are often used without floating floors to reduce sound transmission between adjacent spaces. Here the floor provides a possible flanking path, but if results in the STC 60 range
are satisfactory this is certainly a valid technique. All of the wall specifications are meant to be
used with or without the floor specifications as required.
19
SPRINISOLATED WALLS RESTING ON FLOATING FLOOR specification
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PRODUCT DETAILS
CAULK
DNSB Sway Braces
50
400
B
250
1200
A
(in)
B
(in)
C
(in)
2
21/2
3
3
33/4
21/2
Bolted
End for
Steel
Studs
C
Wall must be supported at the base. Theoretical
horizontal load is zero and assigned maximum
weight is limited by possible development of
buckling or overturning forces.
CONCRETE
BLOCK
WALL
Alternate Hooked
End for Masonry
WIC Sway Braces
DNSB
SWAY
BRACE
A
Min Braced
Weight to
Establish
15Hz
(lbs)
Assigned
Max Weight
per Brace
(lbs)
A
(in)
50
100
250
500
1
2
33/4”
Wall must be supported at the base. Theoretical
horizontal load is zero and assigned maximum
weight is limited by possible development of
buckling or overturning forces.
13/4”
WCL Sway Braces
FLOOR IN
RAISED
POSITION
NOTE: The floating floor specifications already include provision for
floating walls. The following independent specification is provided for
additional clarity.
MASONRY WALL ISOLATION, WALLS RESTING ON FLOATING
CONCRETE FLOOR
Download This Specification
A. Scope
Isolate masonry walls shown on drawings from building structure
by supporting them on the floating concrete floor. Brace them with
resilient sway braces and anchor the top by means of resiliently
lined angle iron guides.
B. Materials
Download All Product Details
1. Wall Sway Braces: Double acting neoprene sway braces with a
fail safe feature in three planes. Braces shall be furnished with a
bracket for bolting to the structural wall and a hooked end for
insertion in the masonry joint. Braces shall have a frequency not
in excess of 10Hz based on the weight of the wall area per brace
and a vertical stiffness not in excess of 50% of the horizontal.
2. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(10mm) sponge cemented to the vertical leg.
3. Caulking Compound: Non-hardening, non-drying and non- bleeding.
C. Wall System Construction Procedure
1. If the drawings call for sway braces, raise the floating floor to operating position before attaching the first row of sway braces to the
walls. If no sway braces are used, construct the walls before raising floor if walls do not cover isolator access.
20
Min Braced
Max
Weight to Assigned
Establish
Wall
10Hz
Weight
(lbs)
(lbs)
AB-716
ANGLE
BRACKETS
A
Min Braced
Weight to
Establish
15Hz
(lbs)
Assigned
Max Weight
per Brace
(lbs)
100
500
31/4”
1” plus runner
width or as req’d
SWW
AB-716 Angle
Wall Isolators
Brackets
16 gauge
Steel
2”
24”
11/2”
Two 5/16”
Waffle Pads
2”
3/8” Sponge
2. Build concrete block wall on perimeter of floating floor leaving a
31/2”(90mm) gap between the building wall and the floating wall.
(31/2”(90mm) may be reduced to 2”(50mm) if no sway braces are
needed.)
3. Cement 2”(50mm) fiberglas to the structural wall. When buttering
all joints, concrete should not be allowed to drop behind the wall
and short circuit the air gap. The fiberglas will prevent accidental
droppings.
4. Set sway braces as shown on drawings and anchor hooks in mortar joints.
5. Bolt one angle bracket to structural ceiling with sponge leg facing
new wall.
6. Continue construction to ceiling leaving a minimum gap of
1/2”(12mm) on top with the floating floor elevated. Check to be
certain gap is continuous.
7. Secure other angle to structural ceiling with sponge leg vertical and
bearing on wall. Angles shall be continuous on both sides of wall.
8. Caulk all accessible joints.
D.
1.
2.
E.
Submittals
Load and deflection curves of all sway braces in both planes.
Detailed drawings of angle braces.
Manufacturer
1. Subject to compliance with the specifications, the following products are approved for use: Type DNSB Sway Braces,
AB-716 Angle Braces and CC-75 Caulking Compound all as manufactured by Mason Industries, Inc.
SPRINISOLATED MASONRY WALLS ON STRUCTURAL FLOOR and
GYPSUM BOARD WALL specifications
The method below is used when walls are extremely tall and heavy so
that support on the floating floor becomes impractical. There are also
installations where only adjacent space must be protected and no
floating floor is required.
quency not exceeding 15Hz based on the total weight of the wall area
per brace”. Under materials and manufacturer they should be referred
to as type WIC rather than DNSB.
MASONRY WALL ISOLATION, WALLS RESTING ON ISOLATION
PADS.
Download This Specification
A. Scope
Isolate masonry walls shown on drawings from building structure
by supporting them on two 5/8”(16mm) thick neoprene isolation
pads, bracing them with resilient sway braces and anchoring the
top by means of resiliently lined angle iron guides.
B. Materials
Download All Product Details
1. Wall Isolation Pads: Two layers of 5/16”(8mm) thick neoprene
waffle pad molded to the following AASHTO Table B properties
and cemented to a 16 gauge sheet metal form cut to the full width
of the wall. Sections shall be furnished 6’(2m) long with corrugated steel anchors riveted or welded to the plates to facilitate
anchoring of the walls. Waffle pad may be cut in lengthwise strips
to reduce area and allow for the proper deflection. Dynamic frequency shall not exceed 14Hz.
ORIGINAL PHYSICAL
PROPERTIES
TESTED FOR AGING
OVEN AGING(70h/212°F)
OZONE
COMPRESSION SET
ASTM D-573
Tests: ASTM D-676 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
Hardness
(max)
Tensile
Strength
(max)
40±5 2000 psi 450%
50±5 2500 psi 400%
60±5 2500 psi 350%
+15%
+15%
+15%
±15%
±15%
±15%
ASTM D-1149
ASTM
D-395
Elongat. 1 ppm in air
at Break by Vol.20% 22hrs 158F°
(max)
Strain 100F° Method B
-40%
-40%
-40%
No Cracks
No Cracks
No Cracks
30%(max)
25%(max)
25%(max)
2. Neoprene Cement
3. Wall Sway Braces: Double acting neoprene sway braces with a
fail safe feature in three planes. Braces shall be furnished with a
bracket for bolting to the structural wall and a hooked end for
insertion in the masonry joint. Braces shall have a frequency not
in excess of 10Hz based on the weight of the wall area per brace
and a vertical stiffness not in excess of 50% of the horizontal.
4. Angle brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(10mm) sponge cemented to the vertical leg.
5. Caulking Compound: Non-hardening, non-drying and non- bleeding.
C. Wall System Construction Procedure
1. Strike lines on the floors and cement the 6’(2m) long wall supports
in position with neoprene cement.
2. Cement 2”(50mm) fiberglas to the structural wall.
3. Lay the first course of blocks being certain to bend up the corrugated anchors to embed them in the mortar joints.
4. Build up the concrete wall taking special care to completely butter
all joints. Where sway braces are used, leave a 31/2”(90mm) gap
between the acoustical wall and the building structure. Do not
allow mortar to drop behind wall and short circuit the air gap. The
2”(50mm) fiberglas will help prevent short circuiting.
5. Set sway braces as shown on drawings and anchor hooks in mortar joints.
6. Bolt one angle bracket to structural ceiling with sponge leg facing
new wall.
7. Continue construction to ceiling leaving a minimum gap of
1/2”(12mm) on top. Check to be certain gap is continuous.
8. Secure other angle to structural ceiling with sponge leg vertical
and bearing on wall. Angle shall be continuous on both sides of
wall.
9. Caulk all joints.
D. Submittals
1. Load and deflection curves of all sway braces in both planes.
Load and deflection curves of wall isolation pads. Detail drawings
of angle braces.
E. Manufacturer
1. Subject to compliance with the specifications, the following products are approved for use: Type SWW Wall Isolators, DNSB Sway
Braces, AB-716 Angle Braces and CC-75 Caulking Compound. All
as manufactured by Mason Industries, Inc.
NOTE TO ARCHITECT:
When you cannot leave a 31/2”(90mm) gap between the isolated wall
and the basic structure, it is necessary to use a stiffer type of sway
brace as the neoprene materials must be made thinner. If there is an
inch and a half gap, the item can be defined as a “Double acting neoprene sway brace consisting of two interlocking metal sections separated by 5/16”(8mm) thick neoprene waffle pad with a horizontal fre-
CONCRETE BLOCK
PAD SUPPORT
GYPSUM
3 1/2” AIR GAP
GYPSUM
2” AIR GAP
Gypsum walls are used to reduce weight and cost when lesser performance remains acceptable.
GYPSUM BOARD FLOATING WALLS RESTING ON FLOATING
FLOORS
The following specification is meant as a general guide for the
construction of gypsum board or similar sound barrier walls. There
are so many variations in construction that our specifications can
only be very broad and must be specifically tailored to each individual application.
Download This Specification
A. Scope
1. Isolation of gypsum board walls from building structure by putting
them on the floating concrete floor, bracing them with resilient
sway braces and establishing a sound seal either at the structural or acoustical ceiling.
Download All Product Details
B. Isolation Materials
1. Wall Sway Braces: Double acting neoprene sway braces with a
fail safe feature in three planes. Sway braces shall be made with
a bracket for bolting to the building structure and a projecting
anchor bolt with adjusting nuts for plumbing the wall structure.
Sway braces shall have a horizontal frequency not in excess of
10Hz based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal.
2. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provisions for bolting to the structure and a minimum thickness of
3/8”(10mm) sponge cemented to the vertical leg.
3. Caulking Compound: Non-hardening, non-drying and non-bleeding.
4. One and a half to three pound density fiberglass 2”(50mm) thick.
C. Wall System Construction Procedure
1. Raise the floating floor to operating position before constructing
walls. Bolt the wall foot channel to the perimeter of the floating
floor and set the vertical channels in position.
2. Bolt the sway braces to the structural wall as shown on the drawing and use the leveling nuts to plumb the channels and set them
in their vertical position.
3. Attach 2”(50mm) fiberglas to building walls.
4. Add horizontal steel members in the normal manner and cover
entirety with two layers of 3/4”(20mm) gypsum board staggering
and overlapping all seams.
5. Where drawings indicate, gypsum board terminates at the structural ceiling, stop the gypsum board 1/2”(12mm) short of the ceiling and lock in place with the 11/2”(40mm) x 2”(50mm) isolation
angles on either side with the sponge rubber facing the gypsum
board.
6. Where the gypsum board forms a seal with the isolation ceiling,
terminate the gypsum board as shown on the details without the
angle iron braces.
7. Caulk all joints.
D. Submittals
1. Submittals shall include load and deflection curves of all sway
braces.
E. Manufacturers
1. Subject to compliance with the specifications the following products are approved for use: Type DNSB Sway Braces as manufactured by Mason Industries, Inc.
21
SPRINISOLATED SUSPENDED CEILINGS discussion
PRODUCT DETAILS
WHD Neoprene Hangers
B A
C
Load Range
(lbs)
Up to 125
Up to 650
A
(in)
23/4
41/2
B C C
(in)
(in)
41/8 2
7
41/4
W30 Spring Hangers
BA
C
30°
Load Range
(lbs)
12 to 95
138 to 336
A
(in)
41/2
43/8
B
(in)
71/4
73/8
C
(in)
23/4
4
W30N Neoprene & Spring
Hangers
B A
C
There are two types of resiliently suspended ceilings.
The most common is a lightweight mechanical ceiling that contains the lighting fixtures, the outlets for
the air conditioning system, etc. These lightweight ceilings consist of light steel framing drop-in absorptive tiles that are generally 24”x24” or 24”x36”. The primary purpose is to absorb sound within the room
and to lower the reverberation rate. Because the material is so light, there is virtually no reduction in
transmitted noise either in or out of the room.
Acoustical barrier ceilings are entirely different. In years past they might have been plaster on wire
lathe, but modern construction is two layers of 5/8” gypsum board screwed together with staggered
joints. Every effort is made to seal the perimeter as well as any penetrations. While these ceilings are
still lightweight as compared to concrete floating floors, they do have sufficient mass to act as sound
barriers and the fact that they are carefully caulked and sealed puts them in a totally different category than the mechanical ceilings described above.
Barrier ceilings are primarily used to reduce noise transmission from the floor above. In most cases an
architect will choose either a floating floor in the equipment room or a barrier ceiling in the space below.
However, the two methods are sometimes used in conjunction with one another.
In other applications the ceilings help contain noise. Thus, an equipment room may have a suspended
ceiling to complete the isolated wall and floor design. This is a common procedure for adjacent music practice rooms, particularly when the double partition walls do not reach all the way to the structural ceiling.
Barrier ceilings are light as compared to floating concrete floors, so the effectiveness of the ceiling is
far more dependent on the air gap than mass or rigidity. Since the air must allow for the inclusion of the
hangers and support steel, a minimum air gap is about 12”. Lightweight fiberglas bats are placed over
the barrier ceiling to further improve the performance.
The building service ducts, electrical conduits, etc., pass beneath it and above a removable tile
mechanical acoustical ceiling. The acoustical hangers are located in the supporting rods or wires common to both ceilings. When the barrier ceiling is penetrated by wires, rods or straps, these members
must be isolated by means of resilient sleeves and they should be caulked as well.
While the double ceiling method is probably the most effective approach to the problem, vibration hangers are commonly used to support single ceiling systems as well. If the single ceiling is of the sound barrier type, the vibration isolator helps to prevent the passage of structural noise just as in the case of the
double ceiling. Hangers used to support simple mechanical ceilings prevent rattling of the ceiling members.
A mounting that “looks into” or rests on a rigid structure has a simpler task than one working against
something that is flimsy. In the case of floating floors, the neoprene isolators or springs rest on the main
structure, which is comparatively rigid. In the case of ceiling hangers, we often start with the noise and
vibration at the concrete building structure and move down a rod or wire to the vibration control hanger and then on to the suspended ceiling. Under the best of circumstances, when this is a plastered ceiling, it is still a very flexible diaphragm without concentrated mass as compared to the concrete floor
that a floor mounting rests on. Therefore, a hanger must be very carefully designed or it will not have
the comparative flexibility to do the job.
Very little test work has been done to show the effectiveness of acoustical ceilings using isolation hangers. In 1969 we tested lightweight components. We started with a 3” gypsum concrete floor with an STC
of 41 and suspended a single 5/8” gypsum board ceiling using W30N hangers with 1” static deflection.
The air gap was 12” . The STC went up to STC 50 for an improvement of nine as tabulated in Test Four.
Most ceilings are made up of two layers of 5/8” gypsum board with lightweight fiberglas bats laid over the
top. Therefore, it is safe to assume that the average barrier ceiling provides an improvement of STC 14.
30°
Load Range
(lbs)
12 to 95
138 to 336
A
(in)
51/2
81/4
B
(in)
10
11
C
(in)
31/2
43/4
Test FOUR
TRANSMISSION LOSS TEST
(KAL-714-9-69)
Lightweight 3” Lightweight
FreGypsum Gypsum Floor
quency 3” Floor
& Suspended
(Hz)
Only
5/8” Ceiling
125
27
35
160
26
32
200
31
36
250
32
39
315
30
39
400
33
43
500
38
47
630
38
50
800
41
53
1000
43
57
1250
44
59
1600
45
64
2000
48
67
2500
51
69
3150
51
71
4000
54
76
STC
41
50
5/8” Gypsum board ceiling suspended
12” below 3” gypsum concrete floor and
hung from W30N hangers.
22
We manufacture a very wide range of ceiling hangers in order to be competitive when other vendors
are specified. In this bulletin, however, we are discussing only three major categories consisting of the
WHD, W30 and W30N. Our suggestions are as follows:
Series WHD - Simple neoprene vibration hangers are used in low budget applications or for those
installations where it has been clearly established that there is little or no structural vibration. The hangers serve as noise breaks only, as static deflection is limited.
Series W30 - Steel coil spring vibration hangers are far superior to the neoprene designs because the
higher deflection spring element will serve to isolate building vibration. The design includes a neoprene
cup in series with the spring that acts as a partial high frequency noise barrier.
Series W30N - Combination hangers make use of the WHD neoprene element in series with the W30
spring. Thus the design combines the best features of the all neoprene and the spring hangers and we
recommend them for all critical applications.
15° Misalignment Tolerance - Both our spring and combination spring and neoprene hangers are
designed so that the hanger rod or wire can be off vertical by as much as 15° without rubbing on the
steel hanger box and transmitting noise. We continue to manufacture lower priced competitive hangers that do not have this angular tolerance, but we invented the 30° sweep design, because most field
problems stem from a contractor’s difficulty in lining up what may be hundreds of hangers perfectly. If
they do not, the wires and rods rub.
Precompression - We strongly recommend that all spring hanger installations have the spring elements partially precompressed at the factory before they are installed. If the springs are not precompressed, the ceiling will descend as much as an 1” when the spring deflects as weight is added. The
contractor will have great difficulty in preventing cracks in plaster ceilings or finishing with a flat ceiling
at the proper elevation. When the spring hangers are precompressed 70% of the total travel, the ceiling will not descend at all until the installation is about completed and the travel will only be 0.30” to
completion.
The architectural drawings should show the construction of the isolated ceilings and the spacing of the
ceiling hangers. They are usually on 48” centers in both directions. The hanger most commonly used
on our jobs and our standard recommendation is the Type W30N. Under Materials and Manufacturer,
however, we have repeated the specification for each type so you can select your preference. Since
the construction procedure is the same in all cases, it was pointless to keep rewriting the same specification over again. By the same token, the specification can be changed slightly to cover any type of
construction such as a sand plaster ceiling or a simple acoustical tile ceiling by substituting your materials where we call for two layers of 5/8” Gypsum Board.
SPRINISOLATED SUSPENDED CEILINGS specification
CEILING
HANGER
CEILING
SUPPORT
WIRES
DUCT
FIBERGLASS
BATS
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DUCT
CAULK
CONSTRUCTION PROCEDURE STEP 2.
AVOIDING AN INTERFERENCE.
STEEL
CEILING
GRID
ISOLATED CEILINGS SUSPENDED BY RESILIENT HANGERS
Download This Specification
A. Scope
To prevent the transmission of noise and vibration through the
ceiling hangers and the suspended ceiling.
B. Materials
Download All Product Details
(Select one of the following as 1)
1. Combination Neoprene Element and Spring Hangers: Hangers
shall consist of a steel frame containing a neoprene isolation element at the top and a coil steel spring seated in a neoprene cup
on the bottom. Both the element and the cup shall be molded with
a neoprene bushing that passes through the steel frame. The neoprene element shall be capable of a minimum deflection of
0.23”(6mm) and the steel springs selected from a 1”(25mm) static deflection series with a minimum additional travel to solid of
1/2”(12mm). Spring diameters and hanger box lower hole size
shall be large enough to permit the hanger rod to swing through a
30° arc before contacting the box and short circuiting the spring.
Hangers shall be selected for a minimum of 0.75”(20mm) spring
deflection and factory precompressed 70% of the total deflection
determined by the assigned load per hanger. Hangers shall be
manufactured with provision for bolting or attaching to the ceiling
flat iron straps, wire, rods or steel runners. Hangers shall be fail
safe.
1. Spring Hangers: Hangers shall consist of a steel frame containing
a coil spring seated in a neoprene cup. The cup is molded with a
rod isolation bushing that passes through the hanger frame.
Hangers shall be selected from a 1”(25mm) static deflection
series with a minimum additional travel to solid of 1/2”(12mm).
Spring diameters and hanger box lower hole size shall be large
enough to permit the hanger rod to swing through a 30° arc before
contacting the box and short circuiting the spring. Hangers shall
be selected for a minimum 0.75”(20mm) spring deflection and factory precompressed 70% of the total deflection determined by the
assigned load per hanger. Hangers shall be manufactured with
provision for bolting or attaching to the ceiling flat iron straps,
wires, rods or steel runners. Hangers shall be fail safe.
1. Neoprene Hangers: Hangers shall consist of a steel frame containing a neoprene isolation element molded with a rod isolation
bushing that passes through the hanger frame. Deflections shall
be a minimum of 0.23”(6mm) and a maximum of 15% of the elements height. The dynamic frequency shall not exceed 10Hz. The
isolation elements shall be molded to the following AASHTO Table
B bridge bearing properties. Hangers shall be manufactured with
provision for bolting or attaching to the ceiling flat iron straps,
wires, rods or steel runners. Hangers shall be fail safe.
ORIGINAL PHYSICAL
PROPERTIES
TESTED FOR AGING
OVEN AGING(70h/212°F)
OZONE
COMPRESSION SET
ASTM D-573
Tests: ASTM D-676 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
Hardness
(max)
Tensile
Strength
(max)
40±5 2000 psi 450%
50±5 2500 psi 400%
60±5 2500 psi 350%
+15%
+15%
+15%
±15%
±15%
±15%
ASTM D-1149
ASTM
D-395
Elongat. 1 ppm in air
at Break by Vol.20% 22hrs 158F°
(max)
Strain 100F° Method B
-40%
-40%
-40%
DUCT
HANGERS
No Cracks
No Cracks
No Cracks
30%(max)
25%(max)
25%(max)
GYPSUM
BARRIER
CEILING
ACOUSTICAL
CEILING TILE
2.
3.
C.
1.
Closed cell neoprene sponge 1/4”(6mm) thick.
One and a half to three pound density 2”(50mm) thick fiberglas.
Isolated Ceiling Construction Procedure.
Lay out ceiling support wires on 48”(1220mm) centers in both
directions.
2. Where ducts or other mechanical interferences occur, a rigid steel
trapeze can be run under the interference and a ceiling hanger
hung from the trapeze to maintain the 48”(1220mm) centers.
Where head room does not allow for this, the steel trapeze can be
installed with an isolation hanger on each end and a ceiling wire
hung from the trapeze to the floating ceiling.
3. Install isolation hangers making certain that hangers are vertical
and that they do not rub against pipe, duct, ceiling beams or other
interferences.
4. Connect wires to lower end of hangers and proceed with steel
ceiling grid construction in the normal manner. Attach the first
layer of 5/8”(16mm) gypsum board to the ceiling steel covering the
upper surface of the gypsum board with 2”(50mm) fiberglas bats
as completely as possible.
5. Attach the second layer of 5/8”(16mm) gypsum board being certain to stagger the joints in all cases.
6. Install lightweight angles around the perimeter of the ceiling by
bolting one leg to the wall and resting the 1/4”(6mm) neoprene
sponge on top of the horizontal leg so as to provide a support for
the perimeter.
7. Caulk the perimeter.
8. When an acoustical tile ceiling is to be used below the sound barrier ceiling, continue the hanger wires to the acoustical ceiling and
caulk all hanger wire penetrations where they pass through the
gypsum ceiling.
9. Where mechanical equipment, pipes or ducts fall below the barrier ceiling, provide additional hangers that are not connected to the
barrier ceiling for this equipment and sponge sleeves where these
rods pass through the barrier ceiling. Caulk the perimeter of all
sleeves.
10. Continue with the construction of the acoustical tile ceiling in the
normal manner.
D. Submittals
1. Load and deflection curves of all hangers. Certification of the neoprene compound to the AASHTO specifications as well as the
Dynamic Frequency.
(Use 2 for W30N or W30 only)
2. A full scale drawing of the hangers showing the minimum 30° contact arc in all planes. Submittals shall include compressed spring
height and spring rates.
E. Manufacturer
Subject to compliance with the specifications, the following products are approved for use: (Select One) (Type W30N Combination
Spring and Neoprene Hangers.) (Type W30 Spring Hangers.)
(Type WHD Double Deflection Neoprene Hangers) as manufactured by Mason Industries, Inc.
23
SPRINWOODEN FLOATING FLOORS discussion & specification
It is often necessary to provide a wooden floating floor rather than the heavier concrete conPRODUCT DETAILS
Business
struction with wood topping.
Cost or Card
weight restrictions may be the factor. In older buildings it is
often necessary to improve on Logo
existing floors with a lightweight impact noise resistant construc- ND Double Deflection LDS Mounts
tion. A resiliently supported wooden floor will reduce the rumbling noise of a bowling ball, the click,
click of a woman’s heels and that portion of a typical noise generated by a piano that travels down Height Saving D
Simpler ND
the piano legs and into the structure. It will offer only minor reduction of airborne sound, as there ND Mounting
Mounting Position
is insufficient mass in the surface. In some applications on stages or in rehearsal rooms the priPosition
mary purpose is relief and comfort for the dancers. Landing on concrete or hard mounted wood
1” Wood
surfaces is very damaging to a dancer’s feet and legs.
5/8”
Nail
We have run some tests on INR and IIC as noted below, and hope to run other tests on STC, but
have not done so at this writing. We have seen meaningful results, however, using this construction under judo rings, rehearsal dance floors, bowling alleys, gymnasium floors and high
A
school machine shops.
C
B
In most cases, we have used our type ND mountings, and occasionally our type MFS spring
designs. We have included a typical specification using the ND mountings and prefer not to write a
Lowest
general specification for springs, as spring selections are very construction dependent. Please let
Load
Max Dynamic
Range
Defl.
Freq.
A
B
C
D
us help you specifically on direct mounted spring applications.
(lbs)
(in) (60 Duro) (in)
(in)
(in)
(in)
Our wooden floor specifications can be modified depending on your specific construction and fin15 to 150 0.23
9 Hz 33/16 15/8
11/2 11/4
ish. For example, rather than plywood you might be using heavy tongue and groove sub-flooring
50 to 300 0.28
8 Hz 37/8 25/16 11/2 13/4
across the sleepers and a hardwood finish.
140 to 600
0.40
1/8” VINYL ACOUSTICAL TILE
Test
1
3” STRUCTURAL SLAB
ON STEEL DECK
HUNG ACOUSTICAL CEILING
Test
2
}
Test
3
TYPICAL WOODEN FLOATING FLOOR
WOODEN FLOATING FLOORS FOR DANCE FLOORS, STAGE FLOORS,
BOWLING ALLEYS, GYMNASIUMS, LIGHT DUTY MACHINE SHOPS, ETC.
A. Scope
Isolate the wooden floating floor from the building structure by means
of double deflection LDS isolators and perimeter isolation.
Spec
B. Materials
1. Sleepers: Kiln dried 2x4’s minimum 12’(3.6m) long.
Details
2. Flooring: 2 layers 3/4”(20mm) AC plywood.
3. LDS Isolators: Minimum of 11/2”(40mm) high with an extended LDS
covered base plate and a tapped steel insert on top. Isolators shall be
selected for a maximum of 0.23” deflection and shall be molded to the
following AASHTO Table 1 Bridge bearing properties.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
4. Perimeter Isolation Sponge: Neoprene sponge 1/2”(12mm) thick.
5. Fiberglass Insulation: Unfaced lightweight 11/2”(40mm) – 3# Density
Fiber-glass Insulation Batts
}
3/4” PLYWOOD
2 X 4 WOOD SLEEPER 16” on Center
MASON ND MOUNT 24” on Center
6.5 Hz 51/2
35/16
23/4 25/8
MFS
Spring
Floor
Mounts
1” Wood
Nail
SAME AS TEST 1
SAME AS TEST 2
EXCEPT WITH FIBERGLASS
IN VOID BENEATH PLYWOOD
Robt. A. Hansen Assoc.
Field Test 1081 Apr 76
DOUBLE LAYER
PLYWOOD PATTERN
C. Floor System Construction Procedure
1. Cement 1/2”(12mm) thick neoprene sponge to walls around entire floor
area. Neoprene strip should be full height of overall construction.
2. Counter bore holes on 24”(600mm) centers in underside of 2x4 sleepers
so that the depth allows for an unloaded clearance of 5/8”(16mm)
between the underside of the sleeper and the top of the isolator base
plate. Holes shall be large enough to provide a minimum clearance of
1/4”(6mm) all around the diameter of the isolators. Bolt the isolators to
the 2x4 with flat head machine screws in countersunk holes.
2a. When height is not critical, use the following alternate.
Invert the LDS isolator and nail securely to the underside of the 2x4
sleeper on the center line.
3. Place the sleepers all around the perimeter of the room up against the
neoprene sponge perimeter isolation.
4. Place the balance of the sleepers in parallel rows on 16”(405mm) centers across the room as shown on the drawings.
5. Lay 11/2”(40mm) – 3# Density Fiberglass Insulation between rows of sleepers.
6. Attach the first 3/4”(20mm) layer of plywood to the sleepers with 2”
(50mm) flat head screws on 16”(405mm) centers. Lay the rows of plywood down so the joints are staggered by 48”(1220mm) and the plywood is snug against the perimeter neoprene sponge.
7. Lay the second layer of 3/4”(20mm) plywood down with the joints offset
16”(405mm) in both directions in relation to the first layer. Attach the
second layer of plywood to the first by means of 11/2”(40mm) long flat
head wood screws on 16”(405mm) centers in both directions. Use
wood glue between layers.
8. Apply floor finish as shown on the drawings.
D. Submittals
1. Load and deflection curves of all isolators.
2. Certification of the elastomeric compound to the listed AASHTO specifications.
E. Manufacturer
The following products are approved for use: Double Deflection LDS
Mountings manufactured to AASHTO specifications.
Mountings shall be Mason Industries, Inc. Type ND-BBP.
We are represented throughout the United States and Canada as well as many other parts of the world. Please call New York or Los Angeles with
your application problems. We are here to help you in every way possible.
SEND FOR OUR COMPLETE CATALOG
MASON INDUSTRIES, INC.
350 Rabro Drive,Hauppauge, NY 11788 • 631/348-0282 • FAX 631/348-0279
2101 W. Crescent Ave., Suite D • Anaheim, CA 92801 • 714/535-2727 • FAX 714/535-5738
Email [email protected] or [email protected] • Website www.Mason-Ind.com
5/06
Tm605
Printed
in U.S.A.
to dramatically Increase your
Sound Transmission Class and
Impact Noise Rating
BULLETIN
ACS-102-3
Why not use the
MASON
JACK-UP
FLOOR SLAB
SYSTEM
and eliminate the cost and need for:
• Combustible, rot prone plywood forms.
• A myriad of transmission paths through
closely spaced supports.
• Moisture retaining fiberglass infill that plugs
sub-drains and encourages vermin.
while gaining:
• An easier, lower frequency isolation method.
• A positive air gap.
• A floor supported by Mason Low Dynamic
Stiffness Rubber– the time tested, low
frequency, exposure-proof and truly
structural material, at lower cost.
Our Riverbank Test Data demonstrates that a four-inch
thick concrete floor floating on neoprene mounts improves
the STC by 25 if raised two inches and that the INR goes
up by 44... Tests using our lower frequency LDS mounts
would add to these tremendous improvements.
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Remember, the air gap is the isolator, the jack-screw
lifts the floor to achieve it, and the resilient LDS element
supports the weight while working in parallel with the air.
Mason Industries
originated this
system in 1965.
Why not work with
the company that
created the idea
and has over
1000 successful
installations?
1" to 4"
Air Gap
MASON INDUSTRIES, Inc.
International Manufacturers of Shock, Seismic and Vibration
Control Products, Acoustical Floor Systems, Building Isolation,
Rubber Expansion Joints for Piping and Stainless Steel Hoses
Business Card
To the Architect:
We have been floating floors, resiliently suspending ceilings and isolating walls for close
to 45 years. The need for this acoustical reinforcement has been well established in textbooks, sales literature and acoustical engineering recommendations. Therefore, we
thought it would be helpful to offer a handbook of specific methods and suggested specifications rather than just print another interesting but rather general brochure.
1. There are basically two methods of reducing airborne sound transmission. The first is
to increase the mass of the walls, floors or ceilings and the second is to introduce an air gap
between relatively airtight constructions.
2. When dealing with a monolithic building component such as a solid concrete floor doubling the mass raises the STC by a maximum of 5. Actual test results are shown graphically on page 3. Because of this it becomes impractical to rely on mass alone as a 6” solid
concrete floor has an STC of 54. Doubling to 12” raises the STC to 59. Doubling again to
an unacceptable 24” raises the STC to only 64.
3. Once you decide on the maximum practical weight for the construction the next acoustical step is to split this mass into two components sandwiching an air gap. This air gap triggers a tremendous improvement in STC as shown by the Riverbank Tests of a floating floor
with flanking protection. (Test Two, page 3.) Notice that the addition of a 4” concrete pour
on the original 6” raised the STC from 54 to only 57. The introduction of a 2” air gap between
these sections raised the STC to 79 for a dramatic improvement of 22. Increasing the air
gap to 4” raised the STC to 82. Doubling the air gap raises the STC a theoretical 5, but the
actual result is more like 3 because of resonances.
4. The introduction of lightweight fiberglas in the air space between massive structural elements such as concrete floors or walls is expensive and unimportant. The experimental
inclusion in a 2” void increased the STC by 3 beyond the original 79. (Test Two, page 3.)
This is meaningless at these levels as the 79 is all but unattainable in a commercial structure because of flanking. Fiberglas is an important addition over suspended ceilings, however, where the mass is light and the contribution noticeable.
5. The air gap is the isolator. The purpose of the vibration mounting is to provide structural support without voiding the air gap. Since each mount is a potential transmission path, it
is logical that the fewer mounts or support points, the better the chance of protecting and
not bypassing the air gap.
6. Specifications should be written by the professional for the protection of the client and
not the protection of the vendor. Specifications should emphasize performance characteristics, physical properties and construction rather than manufacturing techniques. In describing a steel spring it would be unimportant whether the steel was produced by the Bessemer
or Open Hearth method. The molder need not be told the proper curing temperature or carbon black particle size and certainly, the glass people know the specific technique for manufacturing fiberglas. It would be important in specifying steel springs to keep the operating
stresses well within the elastic limit; to describe rubber mounts in terms of tensile strength,
permanent set, elongation, compression set, etc. A proper dialogue regarding fiberglas
would similarly cover permanent set, dynamic frequency and most importantly waterproofing tests of this sensitive material that fails when wet.
7. All vendors tend to favor their own products rather than those of their competitors. As
opposed to this, an acoustical expert studies all of the available materials and recommends
what in his unbiased judgment is best for the application. If there is no such person within
your own organization, we continue to suggest that you retain an outside acoustical consultant to help you in this most critical field of client sensitivity.
We would appreciate your comments as to subjects not covered, our method of presenting
this information or any other suggestions to make this booklet more valuable to yourselves
and other people in the architectural and acoustical disciplines.
Very truly yours, MASON INDUSTRIES, INC.
Letter to the Architect
Technical Information & Tests
Concrete Floating Floor Discussion
Replacing Neoprene with LDS
LDS Jack-up Specifications
2
2
3
4&5
6
7 – 12
Table of Contents
Spring Jack-Up Specifications
LDS Form-Work Specifications
Isolated Wall Discussion
Isolated Wall Specifications
12 & 13
14 – 18
19
20 & 21
Isolated Ceiling Discussion
Isolated Ceiling Specifications
Wooden Floating Floor
Discussion & Specification
22
23
24
Mason 4” Thick FSN Floating Floor Tests conducted at
the Riverback Acoustical Laboratory in March and June of 1971.
Effects of 0, 1”, 2”, 3” and 4” Air Gaps on STC & INR.
Business Card
Logo
6” CONCRETE BLOCK
FLANKING
PATHS
W30N HANGERS
5/8” GYPSUM BOARD
SOURCE
ROOM
FLOOR
TEST
ONLY
NOISE
SOURCE
SEAL
1” FIBREGLAS
& CAULKING
FLANKING
PROTECTED
FLOOR TEST
AIR GAP
FSN
JACK UP
MOUNTS
FIBREGLAS
2” POURED
CONC TOPPING
4” FLOATING
CONCRETE
FLOOR
14” T-SECTIONS
SOUND
SOURCE
ROOM
FSN
JACK UP
MOUNTS
4” FLOATING
CONCRETE
FLOOR
RECEIVING
ROOM
MIKE
RECEIVING
ROOM
FIRST TEST MARCH 1971 OF A FLOATING FLOOR ONLY.
DISAPPOINTING RESULTS BECAUSE OF FLANKING PROBLEMS
SECOND TEST JUNE 1971 OF SAME FLOATING FLOOR WITH
ISOLATED WALLS AND CEILING TO PREVENT FLANKING
FIRST TEST DATA IN BROWN, SECOND TEST DATA IN BLACK
FIRST TEST DATA IN BROWN, SECOND TEST DATA IN BLACK
TRANSMISSION LOSS (dB) COMPARISON
Freq. Basic T
Air gaps without
2” air gap
(Hertz) sections
fiber glass infill
with 75%
(cps) and 2”
fiber glass
cover
0”
1”
2”
3”
4”
infill
100
39
38 38 43 50 42 56 45 59 46 56
57
125
39
47 47 44 57 44 60 47 62 47 63
59
160
40
46 46 45 55 45 58 47 59 47 61
61
200
42
49 49 46 63 45 65 46 67 46 66
68
250
45
51 51 47 67 48 69 50 72 50 72
73
315
49
52 52 54 73 54 75 55 77 54 78
79
400
47
50 50 56 73 56 74 57 74 57 77
78
55 55 58 78 59 80 60 80 60 82
83
500
50
630
52
54 54 61 83 62 85 62 86 62 87
86
Riverbank TL-71-152 March 71 Riverbank TL-71-247 June 71
TRANSMISSION LOSS (dB) COMPARISON
Freq. Basic T
Air gaps without
2” air gap
(Hertz) sections
fiber glass infill
with 75%
(cps)
and 2”
fiber glass
cover
0”
1”
2”
3”
4”
infill
800
51
52 52 63 85 63 86 64 87 65 86
88
1000
52
55 55 68 88 68 88 69 88 69 87
89
1250
55
58 58 72 93 72 93 72 92 73 91
95
1600
58
61 61 74 97 73 96 74 95 75 93
97
2000
60
63 63 75 97 75101 76 99 77 97
97
2500
62
65 65 80 101 79104 79 101 80101
100
3150
65
67 67 82 104 84105 85 107 86103
104
4000
68
71 71 87 105 90106 92 105 91104
106
5000
70
72 74 91 102 93101 100 99 97 99
103
57 57 61 76 61 79 63 80 63 82
82*
STC
54
-27 -27 17 17 17 17 17 17 18 18
INR
IIC
-24 -24 68 68 68 68 68 68 69 69
Riverbank TL-71-152 March 71 Riverbank TL-71-247 June 71
40
MASON LOW DYNAMIC STIFFNESS (LDS)
BRIDGE BEARING COMPOUNDS.
DYNAMIC NATURAL FREQUENCY/
DEFLECTION CHART
Tested Dynamic Stiffness
DuroDynamic
meter Compound Stiffness
20
10
8
6
Duro
40-60
Test
60 A-24071-6F 1.30 WIA61797
50 A-24071-6B 1.28 WIA4495
40 A-24070-5
1.17 WIA4495
1.4 Dynamic
Stiffness
Design Curve
4
40-60
2
0.02
Design
Curve
0.04 0.06 0.1
0.2
0.4 0.6 0.8
STATIC DEFLECTION (inches)
AVERAGE STC per ASTM E90 & RM14-2
DYNAMIC NATURAL FREQUENCY (Hertz)
*While the use of infill raises the STC an additional 3 in a 2” air gap, we
feel it is overkill as field flanking will prevent achieving the higher value.
The floating floor @79 STC is already the most sound resistant path.
70
STANDARD MASS/STC LIMP MASS LAW
PREDICTION AND TEST DATA
60
T
DIC
50
ASS
PRE
LAW
PM
LIM
IT
ION
LIM
ER
UPP
IT
LIM
ER
LOW
S
ENT
REM
40
UAL
ASU
ME
ACT
30
Data based on tests conducted by
Riverbank Acoustical Laboratories
20
10
2
4
6 8 10
20
40 60 80 100
FLOOR, WALL or CEILING WEIGHT (lb/ft2)
3
SPRINCONCRETE FLOATING FLOORS discussion
Business Concrete
Card
floating floors are used for many purposes. We have limited this bulletin to the following areas
Logoof Vibration, Sound and Impact Isolation.
1. VIBRATION ISOLATION
Buildings are unavoidably near busy streets, trains and subways even though they contain space that
must be vibration free and have very low NC levels. Examples include television studios and theatres
and in some cases sound test rooms located in the center of factories.
The frequency of the isolator supporting these floors is normally determined by the architect or an
acoustical consultant depending on the input frequencies. Within our range of experience we recommend LDS mountings with a dynamic frequency not exceeding 10 Hz for input no lower than 20 Hz
providing frequencies below 30 Hz are limited in amplitude. Steel spring isolators come into their own
when the input is more severe or below 20 Hz. The required deflection of the springs is dependent on
the input frequency, but most spring floating floor work is done with deflections between 0.5” and 0.75”
to provide frequencies in the 4.5 to 3.6 Hz range. When heavy impact is a major factor, springs are
always required.
We have provided LDS isolators to reduce subway vibration at grade. They were very effective as the
lowest input frequency was measured at 20 Hz and the ground amplitudes were small. In
another application, however, television studios were located on the third floor of an old building. Spring
mountings were specified by the same acoustical consultant as the upper floor amplitudes were high
and frequencies low, not only because of motor truck traffic outside the building, but the passage of
heavy scenery wagons in halls between studios.
VIBRATION
2. SOUND ISOLATION
Typical of these applications are the introduction of floating floors in very noisy equipment rooms located over prime office space or floating roofs as a protection against aircraft noises.
Since we are dealing with the prevention of airborne noise transmission only, LDS mountings are
always the choice. The lowest audible frequency is about 25 Hz so there is no need for mountings of
greater deflection. Spring mountings manufactured with LDS materials in series with the springs would
work equally well in this application, but they are needlessly expensive. Since the floating floor’s frequency is too high to isolate machinery, the only function is the prevention of airborne sound transmission. Machinery supported on the floating floor must have steel or air spring isolators.
3. IMPACT ISOLATION
Examples of straight impact isolation would normally include kitchens, weight rooms or bowling alleys.
A commercial kitchen in an office building generates structurally transmitted noise. The noise
level within the kitchen itself might not be very high, but the rolling of carts, the dropping of dishes,
the rattling of cutlery on steel tables, the placing of pots on stoves, etc., all represent impact and
mechanically transmitted sound. LDS isolators have been effective in most of these applications but
springs are better.
Where gym floors are the problem and we must deal with running, jumping and bouncing balls, LDS
would be effective over a very rigid substructure, but once again springs are the safer approach.
SOUND
JACK-UP (Lift-Slab) SYSTEM
We believe that the most fool-proof and safest way to establish the air gap is the jack-up or lift-slab
method. Plastic sheeting is placed on the sub-floor as a breaker layer, isolators are placed on the plastic sheeting, reinforcing steel or mesh rests on the isolator housings, and the concrete floor is poured.
After the concrete has cured, the slab is lifted to elevation by turning adjustment bolts above each isolator to any specified air gap between 1” and 4”.
FORM-WORK SYSTEM
The alternate, almost obsolete, method is one whereby a continuous layer of the isolation media is
used as a pouring surface. More commonly, individual isolators, the thickness of the air gap are placed
in position in the field and covered with plywood or factory attached to plywood before delivery. The
upper surface is covered with a plastic layer and then the reinforcing is placed on top of the plywood
forms and the concrete poured at finished elevation.
MACHINERY SUPPORT
In our older publications we advocated the support of heavy machinery on full sized structurally supported pedestals or individual structurally supported pedestals as shown in the illustrations on page 5.
While the performance of systems installed that way was excellent, it proved to be a major coordination problem because the pedestals had to be located, poured and anchored to the sub-floor before the
system could go ahead. There was very little saving in cost as we provided isolators around the edges
of these pedestals so there was no saving in the number of isolators. There was the additional labor
of installing perimeter board and caulking. We gradually modified our approach to using this method
for only the heaviest of machinery such as chillers, but based on our continued experience we are now
suggesting continuous floating floors with all the housekeeping pads and equipment on top.
IMPACT
1" to 4"
Air Gap
JACK-UP FLOOR
Recommended Spacing 54”
4
JACK-UP VERSUS FORM-WORK METHOD
When the form-work method is used, the spacing of the mountings is a function of the stiffness of the
forms which support the wet concrete. In using half inch plywood, which is the most common form, we
have tested 12”, 16” and 24” spacing. We have found 24” spacing to be highly satisfactory. Closer
spacing merely means more fussing with light capacity mountings and in comparing 12” with 24” spacing the introduction of four times as many transmission points.
Our development of the lift-slab method accelerated in 1962 when we isolated some 30,000 square
feet of television studios for CBS using jack-up spring mountings. The mountings were designed to the
performance specifications of an acoustical consultant. This new method was an immediate success.
When using the lift-slab technique, the spacing of the isolators is determined by the thickness of the
floating floor and the reinforcement. When 4” slabs are used, a spacing of 54” in both directions is
well within design limitations. Thus we have 1/20 the number of transmission pads offered by a form
work or panel system using 12” spacing. Thicker slabs allow for wider spacing and 60” or more is not
unusual.
SPRINCONCRETE FLOATING FLOORS discussion
Business
Card
Structural tests run in 1974 indicate
that 48”
spacing using 6x6x10 gauge mesh 1” from the bottom is
a very safe system for live loads of 150
Lbs. per square foot, or rolling loads of 350 Lbs. per lineal foot.
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Rolling loads must be considered when rigging machines into place. These allowable loadings were
derived from destruction tests, and based on a 3 to 1 safety factor. The full certified Jones Test Report
is available on request. Extremely heavy concentrated loads are accommodated by isolators directly
under the loads or by using heavier local reinforcing to carry the load to mountings paralleling the
equipment. Heavier reinforcement allows greater spacing.
The most advantageous way of using the jack-up system is to roll the heavy equipment into position
before the floor is raised, so there is no danger of cracking the areas of lighter capacity as the machinery rolls by. The floors are raised with the machinery in place. When it is done this way, all mountings
have the most uniform deflection. While this is the ideal way, the concrete people usually want to be
off the job and the machinery is placed after the floor is raised. This is no problem either, as a lifted
floor is no different than a floor poured at elevation.
In thinking about longevity it seems to be a contradiction to use plywood as the form in series with the
isolator. If moisture is present, even exterior plywood will eventually rot. Plywood between floors is a
fire hazard that violates many state codes and fireproof plywood is very expensive. Why worry about
these problems when the plywood can be omitted with the jack-up system?
1" to 4"
Air Gap
FORM-WORK FLOOR
Maximum Spacing 24”
When deformed metallic forms are specified, many of these objections no longer exist as in one direction the support mountings can be moved out to the larger centers. Fire and rotting is similarly no longer
a problem. However, very few floors are installed this way as steel forms are expensive and difficult to
install, particularly in odd shaped rooms.
We have omitted the use of lightweight fiberglas infill in all of our recommendations, because the
acoustical improvement is negligible as shown in paragraph 4 of the opening letter on page 2. When
water is present between floors, the breakdown of the lightweight fiberglas tends to clog drains and to
hold and carry moisture up to the plywood. This accelerates rotting whether the drains are introduced
in the sub-floor or not.
The jack-up system is easier to install since there is no need to fit unusual contours. The mountings
are placed in position along the edges and the concrete flows to or around the odd shapes. Any air gap
up to 4” can be used at no increase in cost. Perhaps the most important point is that there is no possibility of short circuiting of the air gap by concrete spills between plywood panels. When these accidents happen, there is no way to tell until the floor does not perform properly. In effecting repairs you
must first locate the short circuit, break or cut out that area of the floor, somehow re-establish the reinforcing by welding or tying to the stubs that are left and then repouring the patch. This can never happen with a lift-slab system as the floors are lifted after the concrete has hardened so the air gap must
be clear.
HOUSEKEEPING PAD
ON FLOATING FLOOR
When using the jack-up system, the isolator is within the cast iron housing, so the thickness of the isolator remains 2”, even if the floor is only elevated 1”. If you try to save height with a plywood system,
the thickness of the isolator must be reduced with a loss in efficiency because the isolator frequency
increases. We have installed floors that are 3” thick with a 1” lift for a total height of 4”. A plywood system with the same isolator frequency would have to be 51/2” high minimum. The 11/2” height saving
can be important.
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While we prefer the lift-slab system, we have also included specifications using plywood forms as there
is the occasional application where the forms are practical or for reasons of your own you prefer this
older technique.
EXTREME TRANSIENT LOAD CONDITIONS
Floating floors are sometimes subject to extremely high
transient loads that would deflect the floor beyond structural limits and result in floor failure. Typical of these are
stage floors, floating streets, convention exhibit centers
and major production TV studios. Temporary loadings
are buses, trailer trucks or lift trucks with concentrated
loads as high as 10,000 lbs. in any location. These problems are handled with stop screw isolator designs. The
main adjustment bolt is enlarged to a threaded brass
bushing with a centered steel bolt set to a predetermined clearance above a secondary base isolation plate
and isolation pad. Let us discuss these specialized
applications with you as each problem is different.
SEISMIC CONSIDERATIONS
LIFTING
BUSHING
STOP
SCREW
LDS
PRIMARY
ISOLATOR
CONCENTRATED
LOAD TESTS
STOP
SCREW
CLEARANCE
STRUCTURAL SLAB
LDS OVERLOAD PAD
STOP SCREW FSN
Also available for FS (spring)
In seismic zones the peripheral walls or curbs must be studied and designed to withstand horizontal
floating floor displacement at the maximum acceleration in the area. Typically a 5,000 square foot floor
would weigh 250,000 Lbs. and the weight of any equipment attached to the floor would have to be
added to that. If the system were in a 0.5g zone, the lateral force would be 125,000 Lbs. Assuming the
dimensions were 50 ft. x 100 ft., the 50 ft direction would be most critical and the curb or perimeter wall
designed to resist 2500 Lbs. per linear foot.
UNIFORM
LOAD TEST
Another potentially serious problem is the curling and failure of the concrete floor from the forces introduced by the machinery restraints that must be anchored to the floating floor. The problem becomes
apparent when you visualize a tall, narrow chiller. Acceleration at the center of gravity creates an overturning moment that pulls on the floor on one side and depresses it on the other. A 4” concrete floor
has little inherent resistance to this type of bending and we have addressed this problem with a double acting resilient floor snubber type SFFS as illustrated on page 8 and 14.
The snubber is anchored to the sub-floor and the housing cast into the floating floor. The up and down
clearances are adjusted after the floor has been raised. The floor restraints are grouped near the points
of tension and compression or on either side of the housekeeping pads. The inclusion of these snubbers keeps the floor captive and prevents damage. The generous clearances prevent short circuiting.
We believe we are the first, if not the only company, to offer this engineering development.
DEFORMED
METALLIC FORMS
5
IMPROVED PERFORMANCE BY REPLACING NEOPRENE
WITH LDS (Low Dynamic Stiffness) RUBBER
Business Card
We started Mason Industries
in 1958. Our revolutionary
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designs of high deflection free standing spring isolators, as
opposed to housed mountings, and our literature with down to
earth information made its mark. This generated phone calls
from acoustical consultants asking us to get into the floating
floor business. We asked why. In addition to wanting more than
one source, the implication was that some competitive information was unreliable and they would rather work with us.
much more sophisticated. It is a forced frequency test for resonance at specific frequencies of 5, 10 and 15 Hz. We were
dismayed to find that rather than 1.5 to 1.63, the new results
ranged from an average of 1.8 for 54 durometer to 2.4 for 64.
Using the same test techniques, our new LDS rubber
compounds are below 1.3 in 50 durometer and 1.35 in 60.
This meant the continued use of Neoprene represented too
great a sacrifice in performance.
In those wonderful days we were doubling our volume every
year and keeping up with demand and continued development
of our mechanical systems, led us to answer, we simply were
not ready to enter the floating floor market.
LDS stands for Low Dynamic Stiffness. In addition to exceeding all AASHO Bridge Bearing structural requirements, we had
worked for years to develop compounds with extremely Low
Dynamic Stiffness characteristics even in 60 and 70 durometer as published. Using these compounds lowers frequency
response for a given deflection to improve both vibration isolation and reduce sound transmission. Other than oil resistance,
Mason LDS compounds are far superior to Neoprene in physical characteristics as well. Building Support Pads can have a
lower profile than Neoprene for the same frequency. This is
true of floating floor mounts too, but mounting heights are often
maintained to achieve a specified air gap.
In 1965 one of our representatives ordered Bridge Bearing
Neoprene Pads. While we had been molding rubber for years,
we were not familiar with this specification.
DuPont manufactures Neoprene, and they were a great help.
In addition to the Bridge Bearing formulations, they provided
publications and back up information on Neoprene’s excellent
aging characteristics.
After this exposure to Neoprene, we realized we had a proper
floating floor material. If Neoprene could survive in outdoor
applications, exposed to sunlight, temperature extremes, snow
and rain, it would certainly last for the life of the structure when
located in the dark, cozy, moderate temperature environment,
under a floating floor. We immediately phoned the acoustical
consultants, and asked what frequency they needed
We were told they wanted an isolation frequency of 8 Hz in a
2” air gap. Since the lowest audible frequency is 25 Hz. 25/8
provided an acoustical ratio of 3/1, similar to minimum vibration isolation, and at the higher frequencies, sound loss would
improve dramatically.
We learned that rubber materials are often deflected 10% of
the rubber thickness, and many publications refer to 15%
deformation as a good conservative compression limit. That is
why our 2” thick isolators have published deflections of 0.2”
and a maximum of 0.3”.
Dynamic Stiffness is simply defined as the ratio between the
spring rate in vibratory motion and the static spring rate.
When working with steel springs, the ratio is 1, as spring steel
is a completely resilient material. Rubber materials are quite
different. Dynamic stiffness increases with hardness and in
broad terms, the filler ratio of the materials to the rubber content as well as the type of carbon black reinforcement, plasticizers, etc. It is also very sensitive to the polymer.
We ran our Kodaris Neoprene Dynamic Stiffness test in 1972.
The corrected data showed that at 0.2” deflection, the poorest
situation using 60 duro with a dynamic stiffness of 1.63
increased the frequency to 9 Hz at 0.2” and 7.3 Hz at 0.3” as
compared to a steel spring where 0.2” deflection would be 7 Hz
and 0.3” 5.7 Hz.
In negotiating a recent building support project, we convinced
the client that Neoprene should be used in place of Natural
Rubber. We were not concerned that the specification required
a new dynamic stiffness test, because we believed the Kodaris
test data showing our 50 durometer Neoprene compound had
a dynamic stiffness of 1.50 and 60 durometer 1.63. However,
the dynamic stiffness tests run today are very different, and
In Europe, virtually all isolation work was and is done with
Natural Rubber. In this country, specifications for bridge
bearing rubber supports allow the use of Neoprene or Natural
Rubber. The very great majority of bearings, if not all, are
Natural Rubber. However, there is no requirement for a
low dynamic stiffness, so the compounds are made less expensive by using more fillers and are considerably less
efficient than our designs acoustically. In supporting bridges,
this is unimportant as bearings are used in shear to accommodate expansion and contraction and not for vibration isolation.
There is a mechanical aspect too. Most engineers and
architects are in the habit of pouring concrete on forms with
the bearings directly underneath or erecting steel directly on
the bearings. In this first stage, the loadings are very low so
the bearings hardly deflect. As the building progresses, the
bearings deflect in response to the added weight, which is not
always uniform. The more deflection required to achieve a frequency, the greater the complication of uneven deflections that
may distort the structure or induce cracks. LDS compounds
minimize that problem, because deflections are minimal for the
same frequency.
The use of Natural Rubber has been guided by the Malaysian
Rubber Institute, and just as DuPont has been promoting
Neoprene and other excellent special purpose polymers, the
Natural Rubber industry has been working with the chemical
people to perfect the antiozonants and antioxidants. Other
additives reduce sunlight damage. The new Natural Rubber
materials have become completely reliable in long term aging
tests, so there is no longer any reason to continue with the
Neoprene. We have always improved our offerings, and hopefully, our learning curve will continue.
Based on these conclusions, all acoustical isolation materials,
including the mounts used in Jack-up systems, the EAFM
series, or bearings to support and isolate structures will be
made of LDS materials. (Low Dynamic Stiffness.) Hanger
elements and hanger cups are included as well.
While the danger of oil contamination is minimal, all floor
mounted pads under spring isolators, spring holders, etc., will
continue as commercial grade Neoprene.
Norm Mason
6
MECHANICAL EQUIPMENT ROOM LDS JACK-UP SYSTEM
beginning of specifications
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Business Card
Logo
POLYETHYLENE
SHEETING
REINFORCING
FLOATING FLOOR
CONSTRUCTION
SEQUENCE
FSN
CASTINGS
ISO
LAT
ION
PLACEMENT
OF ISOLATION
MATERIALS
STRUCTURAL
FLOOR
ISOLATED
FLOOR DRAIN
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POURED
CONCRETE
CAULK
ISOLATOR
RUBBER PLUGS
POURING OF
CONCRETE
METER
CAULKED PERI D
AR
BO
N
IO
AT
ISOL
GROUT TOPS
OF ISOLATORS
EQUIPMENT
HOUSEKEEPING PAD
(must be mechanically
secured to floating floor
in seismic zones.)
JACKED UP
FLOATING
FLOOR
SPECIFIED
AIR GAP
The following floor specifications are all written in the format of the
“United States Construction Specifications Institute”. All specifications are available upon request on CD Rom.
LDS JACK-UP SYSTEM FOR MECHANICAL EQUIPMENT ROOMS
WITH MACHINERY SUPPORTED BY THE FLOATING FLOOR.
Type CFDA4 x 4
FLOOR DRAIN
PART 1 - GENERAL
Download This Specification
1.01 Description
A Scope of Work
Download All Product Details
1. Isolate floating floors from building structure by means of jack-up
LDS isolators and perimeter isolation in each of the mechanical
equipment rooms as shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the prod-
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Type FSN
LDS JACK-UP MOUNT
7
MECHANICAL EQUIPMENT ROOM LDS JACK-UP SYSTEM
specification continued
Business
CardSpecifications. Submit samples and
ucts which are listed
in these
test reports by an independent
laboratory for consideration on this
Logo
project.
1.02 Design
A. Intent
1. The floating floor system shall consist of a 4”(100mm) thick concrete slab isolated from and supported 2”(50mm) above the waterproofed structural slab by resilient LDS isolators within cast iron
housings designed to jack up the floor after pouring on the sub-floor.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor with a 31/2” air gap to the structural walls. (31/2”(90mm) may be reduced to 2”(50mm) if no sway
braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls,
columns and curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment within these rooms shall be mounted on housekeeping pads or directly on the floating floor as shown on the drawings.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the floor shall be protected by embedded double acting resilient floor snubbers set in
opposition to the overturning moments at the equipment snubbers
in all locations where the center of gravity of major equipment is
high.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials and raising of the floor shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation or
bolt to the sub-floor.
4. Cover entire floor area with 6 mil (0.15mm) plastic sheeting and
carry sheeting up perimeter isolation.
5. Place bell-shaped castings on a maximum of 54”(1370mm) centers
in the general areas in strict accordance with the approved drawings prepared by the isolation manufacturer. Spacing can be
increased to straddle machinery locations. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
5a. In seismic zones attach double acting resilient seismic snubbers to
the structural slab on either side of high center of gravity equipment
to withstand the overturning moment generated by the machinery
snubbers and prevent failure of the floating floor.
6. Place reinforcing as shown on the drawings and pour floor monolithically.
7. Raise floor 2”(50mm) by means of the jack-screws. (If construction
sequence dictates raising the floor before placing machinery, heavy
planking must be used to protect floor while machinery is being
rolled into position).
8. Caulk perimeter isolation in all locations and grout jack-screw holes.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces and
isolated angle iron wall braces at the top of the walls. Caulk angle
iron braces.
8
10. In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
D. Submittals
1. Detailed product drawings and Load/Deflection curves of all isolators, double acting floor snubbers and/or other snubbing restraints
when required.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete floating floor, a 6”(152mm) structural floor and a 2”(50mm) air
gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections, frequencies and locations and in seismic zones, locations of seismic snubbers.
If sound barrier walls are used, add the following to b:
Wall sway brace and isolated angle iron brace sizes, locations
and frequencies.
c. Any drain and penetration locations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floor or floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials shall be installed and the floor
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating floor or special provisions made for isolator housings of different height.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
2.01 Isolators
A. Bell shaped castings with integral lugs to locate reinforcing, shrouding 2”(50mm) thick LDS isolators molded to the following and all
other AASHTO bridge bearing specifications. All housings shall
have 3/4”(20mm) minimum diameter jackscrews. Deflections shall
not exceed 0.3”(7.5mm) nor the frequency 9 Hz. Isolators shall be
Mason Industries type FSN.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of clearances in both the up and down
directions of the resilient stops. Resilient stops shall be attached to
a restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
MECHANICAL EQUIPMENT ROOM LDS JACK-UP SYSTEM
specification concluded
Business
Card
If sound barrier walls are
used, add
the following:
Logo
C. Wall Sway Braces: Double
acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
D. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets
shall be Mason Industries AB-716.
surrounding the upper section as a between floors sound seal.
Weep holes are required to drain the structural floor. Floor drains
shall have water proofing membrane clamps. Floor drains shall be
Mason Industries Type CFD-18591.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
The following table is a general guide to floor thicknesses and air
gaps. All specifications may be modified to your requirements.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the FSN mountings and
sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
TYPICAL FLOOR CONFIGURATIONS
Floor
Thickness
Air Gap
Overall
Height
3"– Minimum
Most
Common
2"
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
Occasionally
3" or 4"
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating
floor. Lower bucket, built into the structure, shall retain water
4"– Most Common
5"– Seldom
Air Gap
Plus
Floor
Thickness
6"– Common
Thicker Floors or
Fractional Dimensions
As Required. We
have Designed Floating
Floors 12” Thick.
PRODUCT DETAILS
EAFM LDS Mount
FSN LDS Jack-Up Mount
MOUNT
PRIOR TO
POURING
C
A
C
A B
FS Spring Jack-Up Mount
A
Capacity and
deflections are
controlled by
diameter and
durometer.
B
1”
MOUNT IN
RAISED
POSITION
Load Range
(lbs)
A
(in)
45/8
53/8
Typical Sizes
Load
Range
(lbs)
B
(in)
51/2
61/4
Min C
(in)
Max C
(in)
500 to 1700
3 As Reqd
2800 to 3500
3 As Reqd
Dynamic Frequency not to exceed 7.5 Hertz
@ 0.3” Deflection. (60 Duro)
P7 PVC Foam
A
(in)
B
(in)
1/2
Max
Defl
0.15T
(in)
1-3
0.08 15.0
25 - 3500
1-4
1
0.15 11.0
lbs. per 1.5-4.75 11/2 0.23 9.0
mount
2-5
2
0.30 7.5
as req’d 3-4.75 3
0.45 6.0
4-5
4
0.60 5.5
Larger sizes can be molded as required or
mountings clustered for greater capacity.
CFD
Average Density: 7 lbs/cubic foot
Floor
Drain
SFFS
8 3/4”
3/4”
Nominal
Thickness
Available in
Lengths from
4’ to 20’
Floor
Thickness
+ Air Gap
Fits 2”, 21/2”, 3” &
4” Threaded Pipe
Load
Range
(lbs)
Defl
(in)
A
(in)
Min
B
(in)
450 to 1000
1000 to 2935
450 to 680
610 to 1870
1
1
2
2
4
5
4
5
4
4
4
4
¥¥
@@
AA
BB
CC
ÀÀ
ÁÁ
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RR
SS
TT
¢¢
££
¤¤
@@
AA
BB
CC
ÀÀ
ÁÁ
ÂÂ
ÃÃ
RR
SS
TT
¢¢
££
¤¤
¥¥
Seismic
Floating
Floor
Snubber
PVC
Height as
Required
B
Lowest
Dynamic
Freq (Hz)
60 Duro
Clearance fills
with water to
form sound trap
SAB
Anchor
9
TV STUDIOS, THEATRES, etc. LDS JACK-UP SYSTEM
beginning of specification
Business Card
TYPICAL FLOOR WITHOUT MACHINERY
Logo
LDS JACK-UP SYSTEM FOR TV Studios, Theatres, Bowling Alleys,
Kitchens, Squash Courts, Exercise Rooms, etc.
PART 1 - GENERAL
Download This Specification
Download All Product Details
1.01 Description
We have left the blank below for you to fill in the name of the area, i.e.
Auditorium, TV Studio, etc. Please specify floor finish such as hardwood
or tile as you normally do in another section.
A. Scope of Work
1. Isolate floating floors from building structure by means of jack-up
LDS isolators and perimeter isolation in each of the (fill in name of
area) _____________________.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
10
1.02 Design
A. Intent
1. The floating floor system shall consist of a 4”(100mm) thick concrete slab isolated from and supported 2”(50mm) above the structural slab by resilient LDS isolators within cast iron housings
designed to jack up the floor after pouring on the sub-floor. Sub
floors shall be waterproofed under kitchens.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor with a 31/2”(90mm) air gap to the
structural walls. (31/2”(90mm) may be reduced to 2”(50mm) if no
sway braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls,
columns and curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials and raising of the floor shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Cover entire floor area with 6 mil (0.15mm) plastic sheeting and
carry sheeting up perimeter isolation.
5. Place bell-shaped castings on maximum 54”(1370mm) centers in
the general areas in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
6. Place reinforcing as shown on the drawings and pour floor monolithically.
7. Raise floor 2”(50mm) by means of the jack-screws.
8. Caulk perimeter isolation in all locations and grout jack-screw
holes.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces
and isolated angle iron wall braces at the top of the walls. Caulk
angle iron braces.
D. Submittals
1. Detailed product drawings and Load/Deflection curves of all isolators.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete
floating floor, a 6”(150mm) structural floor and a 2”(50mm) air gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections, frequencies and locations.
If sound barrier walls are used, add:
wall sway brace and isolated angle iron brace sizes, locations
and frequencies.
c. Any drains or other penetrations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f. Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred similar installations.
B. The floating floor isolation materials shall be installed and the floor
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating floor or special provisions made for isolator housings of different height.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
2.01 Isolators
A. Bell shaped castings with integral lugs to locate reinforcing, shrouding 2”(50mm) thick LDS isolators molded to the following AASHTO
bridge bearing specifications. All housings shall have 3/4”(20mm)
minimum diameter jackscrews. Deflections shall not exceed
0.3”(7.5mm) nor the frequency 10Hz. Isolators shall be Mason
Industries type FSN.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
If sound barrier walls are used, add the following:
B. Wall Sway Braces: Double acting LDS sway braces with a fail
safe feature in three planes. Braces shall be furnished with a bracket for bolting to the structural wall and a hooked end for insertion in
the masonry joint. Braces shall have a frequency not
TV STUDIOS, THEATRES, etc. LDS JACK-UP SYSTEM specification concluded
LDS JACK-UP SYSTEM for ROOFS beginning of specification
Business
Card
in excess
of 10Hz
based on the weight of the wall area per brace and a
vertical stiffness
Logo not in excess of 50% of the horizontal. Sway braces
shall be Mason Industries Type DNSB.
C. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets shall
be Mason Industries AB-716.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average. PVC
foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the FSN mountings and
sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating floor.
Lower bucket, built into the structure, shall retain water surrounding
the upper section as a between floors sound seal. Weep holes are
required to drain the structural floor. Floor drains shall have water
proofing membrane clamps. Floor drains shall be Mason Industries
Type CFD-18591.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
––––––––––––––––––– End of Specification ––––––––––––––––––
LDS JACK-UP SYSTEM FOR ROOFS.
PART 1 - GENERAL
Download This Specification
1.01 Description
A. Scope of Work
Download All Product Details
1. Isolate floating roofs from the building structure by means of jack-up
LDS isolators and perimeter isolation in each of the roof areas
shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products
which are listed in these Specifications. Submit samples and test
reports by an independent laboratory for consideration on this project.
1.02 Design
A. Intent
1. The floating roof system shall consist of a 4”(100mm) waterproofed
concrete slab isolated and supported 2”(50mm) above the waterproofed structural slab by resilient LDS isolators within cast iron
housings designed to jack up the roof after pouring on the sub-roof.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor.
2. The floating roof slab shall be isolated from adjoining walls, columns,
and curbs by means of perimeter isolation.
3. Any equipment mounted directly on the floating roof shall be
installed so as not to damage the roof’s waterproofing.
4. Flashing and waterproofing shall be completed after the roof is
raised. Perimeter flashing shall allow for downward movement of
0.5”(12mm).
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the roof shall be protected by embedded double acting resilient floor snubbers set in opposition to the overturning moments at the equipment snubbers in all locations where the center of gravity of major equipment is high.
B. Performance Requirements
1. The floating roof system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Roof System Construction Procedure
1. The setting of all isolation materials and raising of the roof shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Cover entire floor area with 6 mil (0.15mm) plastic sheeting and
carry sheeting up perimeter isolation.
5. Place bell-shaped castings on maximum 54”(1370mm) centers in
the general areas in strict accordance with the approved drawings
prepared by the isolation manufacturer. Spacing can be increased
to straddle machinery locations. Additional reinforcement must be
detailed on isolation manufacturer’s drawings when required.
If sound barrier walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating roof.
5a. In seismic zones attach double acting resilient seismic snubbers to
the structural slab on either side of high center of gravity equipment
to withstand the overturning moment generated by the machinery
snubbers and prevent failure of the floating roof.
6. Place reinforcing as shown on the drawings and pour roof monolithically.
7. Raise roof 2”(50mm) by means of the jack-screws. (If constructions
sequence dictates raising the roof before placing machinery, heavy
planking must be used to protect the roof if machinery is rolled into
position).
8. Caulk perimeter isolation in all locations and grout jack-screw holes.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces
and isolated angle iron wall braces at the top of the walls. Caulk
angle iron braces.
10. In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
11. Install waterproofing and flashing.
D. Submittals
1. Detailed product drawings and Load/Deflection curves of all isolators and in seismic zones double acting floor snubbers.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete floating floor, a 6”(150mm) structural floor and a 2”(50mm) air
gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections, frequencies and locations and in
seismic zones, locations of seismic snubbers.
c. Any drains or other penetrations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f. Roof system construction procedure.
11
LDS JACK-UP SYSTEM for ROOFS specification concluded
SPRING JACK-UP SYSTEM beginning of specification
1.03 Quality Assurance
Business Card
A. Floating roof system components
shall be designed and fabricated
Logo
by a manufacturer with at least ten years experience in one hundred
similar floor or roof installations.
TYPICAL SPRING CROSS SECTION
B. The floating roof isolation materials shall be installed and the roof
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating roof, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-roof must have the same pitch as the
top of the floating roof or special provisions made for isolator housings of different height.
Key for Spanner Wrench
Cover
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
Ferrous
Housing
Cast into
Floor
System
PART 2 - PRODUCTS
2.01 Isolators
A. Bell shaped castings with integral lugs to locate reinforcing, shrouding 2”(50mm) thick LDS isolators molded to the following AASHTO
bridge bearing specifications. All housings shall have 3/4”(20mm)
minimum diameter jackscrews. Deflections shall not exceed
0.3”(7.5mm) nor the frequency 10Hz. Isolator shall be Mason
Industries type FSN.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of clearances in both the up and down
directions of the resilient stops. Resilient stops shall be attached to
a restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the FSN mountings and
sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Roof Drains
A. Use standard roof drains cast into the floating roof. The structural
floor shall have openings large enough to access pipe connections
to the drains. Drain piping shall be suspended from combination
spring and LDS hangers with a minimum of 1”(25mm) static deflection for 40 feet(12 meters) from the attachment point as shown on
the drawings.
B. Roof drains shall be (Architects Preference)
PART 3 - EXECUTION
3.01 Installation
12
Install the floating roof systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
Steel
Washer
Type FS
SPRING
JACK-UP
MOUNT
RIS Replaceable
Element Interchangeable
with Spring Assembly
Type RIS
RUBBER-IN-SHEAR
FLOOR DAMPER
Subpad
RIS Seat Centers RIS
Element. Bonded Steel
Washer Distributes Load
on Subpad and Reduces
Turning Friction
The damping provided by the air under spring supported floors is normally adequate to limit motion. Occasionally, particularly in small
aerobic rooms, rhythmic exercises amplify floor motion so additional
damping is desirable. The RIS (rubber-in-shear) element solves this
problem. Elements are interchangeable with FS springs and can be
installed in existing housings if needed or included in the design stage
in supplementary locations. Damping rate is controlled by hardness,
material and number of dampers.
SPRING JACK-UP SYSTEM FOR TV STUDIOS, THEATRES, BOWLING ALLEYS, KITCHENS, SQUASH COURTS, EXERCISE ROOMS,
ETC.
PART 1 - GENERAL
Download This Spec
1.01 Description
Download All Product Details
A. Scope of Work
1. Isolate floating floors from the building structure by means of jackup spring isolators and perimeter isolation in each of the
______________ rooms as shown on the drawings. (Architect to fill
in name of room.)
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples for
consideration on this project.
1.02 Design
A. Intent
1. The floating floor system shall consist of a 4”(100mm) thick concrete slab isolated from and supported 2”(50mm) above the structural slab by resilient spring isolators within cast iron housings
designed to jack up the floor after pouring on the sub-floor.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction may be changed by the architect when
writing specification) shall rest on the floating floor with a
31/2”(90mm) air gap to the structural walls. (3”(90mm) may be
reduced to 2”(50mm) if no sway braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
SPRING JACK-UP SYSTEM specification concluded
Business
Card
3. Any floor drains, piping,
conduit
and duct penetrations must not
short circuit the isolation system.
Logo
4. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
If sound barrier walls are used, add the following:
2.01 Isolators
A. Casting or weldments consisting of an internally threaded outer housing complete with lugs to support the reinforcing system. The inner
inverted cup shaped housing shall be externally threaded. The
springs are compressed and the floor lifted by turns of the internal
housing. Springs shall be seated in neoprene cups and housings
shall have removable cover plates. Spring diameters shall be no less
than 0.8 of the compressed height of the spring at rated load. Springs
shall have a minimum additional travel to solid equal to 50% of the
rated deflection. Spring deflections shall be a minimum of
0.75”(20mm). (Note to architect: Deflections may be changed as
required.) Isolators shall be Mason Industries Type FS.
If sound barrier walls are used, add the following:
B. Wall Sway Braces: Double acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
C. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets
shall be Mason Industries Type AB-716.
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
B. Performance Requirements
1. All spring isolators shall have the minimum specified deflection.
C. Floor System Construction Procedure
1. The setting of all isolation materials and raising of the floor shall be
performed by or under the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Cover entire floor area with 6 mil (0.15mm) polyethylene sheeting
and carry sheeting up perimeter isolation.
5. Place spring isolator castings on a maximum of 54”(1370mm) centers in the general areas in strict accordance with the approved
drawings prepared by the isolation manufacturer. Additional reinforcement such as in wall locations must be detailed on isolation
manufacturer’s drawings when required.
6. Place reinforcing as shown on the drawings and pour floor monolithically.
7. Raise floor 2”(50mm) by means of the isolator threaded sleeves
and replace covers.
8. Caulk perimeter isolation in all locations.
If sound barrier walls are used, add the following:
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Readjust perimeter isolators as required to compensate for wall weight as the wall is built.
Provide sway braces and isolated angle iron wall braces at the top
of the walls. Caulk angle iron braces.
D. Submittals
1. Detailed product drawings including Load/Deflection curves of all
isolators.
2. Drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolator sizes, deflections and locations.
If sound barrier walls are used, add the following to b:
Wall sway brace and isolated angle iron brace locations.
c. Any drain and penetration locations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials shall be installed and the floor
raised by or under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating floor or special provisions made for isolator housings of different height.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to
AASHTO specifications, as shown and sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed
pads shall be Mason Industries Type LDS-BBP.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating
floor. Lower bucket, built into the structure, shall retain water surrounding the upper section as a between floors sound seal. Weep
holes are required to drain the structural floor. Floor drains shall
have water proofing membrane clamps. Floor drains shall be
Mason Industries Type CFD-18591.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
Note to Architect: When theatres have sharply sloped floors, FSN or FS
mountings must be furnished with round cast iron or neoprene wedges
at each FSN or FS location so mountings are installed level. In extreme
cases a restraining curb is needed at the base of the slope or the end of
the straight section adjoining the slope.
13
MECHANICAL EQUIPMENT ROOM LDS FORM-WORK SYSTEM
beginning of specification
Business Card
Logo
METER
CAULKED PERI D
ISOLATION BOAR
HOUSEKEEPING
PAD
REINFORCING
POL
SH YETH
EE YLE
TIN NE
G
PL
WOYOD
EAFM
FLOATING
FLOOR
ISO
LAT
ION
AIR
GAP
EAFM LDS
MOUNTS
FLOOR
DRAIN
Type CFDA4 x 4
FLOOR DRAIN
Type EAFM
LDS FLOOR MOUNT
LDS FORM-WORK SYSTEM FOR MECHANICAL EQUIPMENT
ROOMS WITH MACHINERY SUPPORTED BY THE FLOATING
FLOOR.
PART 1 - GENERAL
1.01 Description
A. Scope of Work
Download This Specification
Download All Product Details
1. Isolate floating floors from building structure by means of LDS
isolators under plywood panels and perimeter isolation in mechanical equipment rooms as shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
1.02 Design
A. Intent
1. The floating floor shall consist of a 4”(100mm) thick concrete slab
isolated from and supported 21/2”(62mm) above the waterproofed
structural slab by resilient LDS isolators covered by 1/2” (12mm)
plywood panels that form the pouring surface.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction may be changed by architect when writing
specification) shall rest on the floating floor with a 31/2”(90mm) air
gap to the structural walls. (31/2”(90mm) may be reduced to
2”(50mm) if no sway braces are needed.)
14
2. The floating floor slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment within these rooms shall be mounted on housekeeping pads or directly on the floating floor as shown on the drawings.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the floor shall be protected by embedded double acting resilient floor snubbers set in
opposition to the overturning moments at the equipment snubbers
in all locations where the center of gravity of major equipment is
high.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials shall be performed by or under
the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Place individual LDS isolators on the sub-floor at a maximum spacing of 24”(600mm) in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier isolation walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
5. In seismic zones provide anchorage for the double acting resilient
vertical snubbers to the structural slab. Snubber anchor bolts must
be in close proximity to the mechanical snubbers restraining any
high center of gravity equipment to withstand the overturning
moments generated by the machinery snubbers and prevent failure
of the floating floor.
6. Cover isolators with 1/2”(12mm) AC plywood. Isolators shall be
located under joints and joints staggered. Connect plywood at abutting edges and corners with 16 gauge steel junction plates.
7. Cover the plywood with 6 mil (0.15mm) plastic sheeting and carry it
up the walls past the perimeter isolation.
8. Place seismic snubber housings on the anchor bolts that protrude
from the structural floor and through the plywood.
9. Place reinforcing as shown on the drawings and pour floor monolithically.
MECHANICAL EQUIPMENT ROOM LDS FORM-WORK SYSTEM
specification concluded
Business
Card caulk all perimeter isolation.
10. After the concrete
has hardened,
11.
D.
1.
2.
If sound barrier wallsLogo
are used, add the following:
Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces and
isolated angle iron wall braces at the top of the walls. Caulk angle
iron braces.
In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
Submittals
Detailed product drawings and Load/Deflection curves of all isolators. In seismic zones details of double acting floor snubbers.
AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC-79 and a minimum INR+17 using a 4”(100mm) concrete
floating floor, a 6”(150mm) structural floor and 2”(50mm) air gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolators sizes, deflections, frequencies and locations. In seismic
zones add: “Locations and details of seismic snubbers”.
If sound barrier walls are used, add the following:
Wall sway brace and isolator, angle iron brace sizes, locations and
frequencies.
c. Any drain and penetration locations.
d. Size type elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials and panel board forms shall be
installed under the supervision of the isolator manufacturer.
restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
If sound barrier walls are used, add the following:
C. Wall Sway Braces: Double acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
D. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets
shall be Mason Industries Type AB-716.
2.02 Plywood Covering Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the EAFM mountings
and sized for a maximum deflection of 0.2”(5mm) at maximum
earthquake forces. Interspersed pads shall be Mason Industries
Type LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating
floor. Lower bucket, built into the structure, shall retain water surrounding the upper section as a between floors sound seal. Weep
holes are required to drain the structural floor. Floor drains shall
have water proofing membrane clamps. Floor drains shall be
Mason Industries Type CFD-18591.
2.06 Plywood
A. Type AC exterior grade 1/2”(12mm) thick.
PART 3 - EXECUTION
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation
manufacturer.
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
APPLICATION OF SEISMIC FLOATING FLOOR SNUBBERS
PART 2 - PRODUCTS
2.01 Isolators
CONDENSER
A. Cylindrical LDS mountings with a diameter no less than 0.9 of the
2”(50mm) height. Isolators are molded to the following LDS AASHTO bridge bearing specification. Maximum durometer 60.
Deflections shall not exceed 0.3”(7.5mm) nor the frequency 10Hz.
Isolators shall be Mason Industries Type EAFM.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of resilient stop clearances in both the up
and down directions. Resilient stops shall be attached to a
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SEISMIC
SNUBBER
SFFS
FLOATING
FLOOR
SNUBBER
SNUBBER SHOWN WITH EAFM PANEL SYSTEM
Equally suitable for FSN Jack-Up Floors
15
TV STUDIOS, THEATRES, etc. LDS FORM-WORK SYSTEM
beginning of specification
Business Card
TYPICAL SLOPED THEATRE FLOOR
Logo
5. Cover isolators with 1/2”(12mm) AC plywood. Isolators shall be
located under joints and joints staggered. Connect plywood at abutting edges with plywood junction plates.
6. Cover the plywood with polyethylene sheeting and carry it up the
walls past the perimeter isolation.
7. Place reinforcing as shown on the drawings and pour floor monolithically.
LDS FORM-WORK SYSTEM FOR TV STUDIOS, THEATRES, BOWLING ALLEYS, KITCHEN, SQUASH COURTS, EXERCISE ROOMS,
ETC.
PART 1 - GENERAL
Download This Specification
Download All Product Details
1.01 Description
A. Scope of Work
1. Isolate floating floors from building structure by means of LDS
isolators under plywood panels and perimeter isolation in mechanical equipment rooms as shown on the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
1.02 Design
A. Intent
1. The floating floor shall consist of a 4”(100mm) thick concrete slab
isolated from and supported 21/2”(62mm) above the waterproofed
structural slab by resilient LDS isolators covered by plywood
panels that form the pouring surface.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6” (150mm) filled concrete block
(Barrier wall construction may be changed by architect when writing
specification) shall rest on the floating floor with a 31/2”(90mm) air
gap to the structural walls. (31/2”(90mm) may be reduced to
2”(50mm) if no sway braces are needed.)
2. The floating floor slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment within these rooms shall be mounted on housekeeping pads or directly on the floating floor as shown on the drawings.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
B. Performance Requirements
1. The floating floor system shall have a minimum rating of STC-79
and INR+17 as verified by an independent laboratory in prior tests.
C. Floor System Construction Procedure
1. The setting of all isolation materials shall be performed by or under
the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Place individual LDS isolators on the sub-floor at a maximum spacing of 24” (600mm) in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier isolation walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating floor.
16
8. After the concrete has hardened, caulk all perimeter isolation.
If sound barrier walls are used, add 9.
9. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls. Place 2”(50mm) fiberglass bats
against the structural wall as a precaution. Provide sway braces
and isolated angle iron wall braces at the top of the walls. Caulk
angle iron braces.
D. Submittals
1. Detailed product drawings and load /deflection curves of all isolators.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC-79 and a minimum INR+17 using a 4”(100mm) concrete
floating floor, a 6”(150mm) structural floor and 2”(50mm) air gap.
5. A drawing or drawings showing:
a. Dead, live and concentrated loads.
b. Isolators sizes, deflections, frequencies and locations.
If sound barrier walls are used, add the following:
Wall sway brace and isolator, angle iron brace sizes, locations
and frequencies.
c. Any drain and penetration locations.
d. Size type elevation and spacing of concrete reinforcement.
e. Caulking details.
f.
Floating floor and wall construction procedure.
1.03 Quality Assurance
A. Floating floor system components shall be designed and fabricated
by a manufacturer with at least ten years experience in one hundred
similar installations.
B. The floating floor isolation materials and panel board forms shall be
installed under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
PART 2 - PRODUCTS
2.01 Isolators
A. Cylindrical LDS mountings with a diameter no less than 0.9 of the
2”(50mm) height. Isolators are molded to the following LDS AASHTO bridge bearing specification. Maximum durometer 60.
Deflections shall not exceed 0.3”(7.5mm) nor the frequency 10Hz.
Isolators shall be Mason Industries Type EAFM.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
FOR
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
POLYISOPRENE
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
TV STUDIOS, THEATRES, etc. LDS FORM-WORK SYSTEM specification concluded
LDS FORM-WORK SYSTEM for ROOFS beginning of specification
Card
If soundBusiness
barrier walls
are used, add the following:
Logo
B. Wall Sway
Braces: Double acting LDS sway braces with a fail safe
feature in three planes. Braces shall be furnished with a bracket for
bolting to the structural wall and a hooked end for insertion in the
masonry joint. Braces shall have a frequency not in excess of 10Hz
based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal. Sway Braces shall be
Mason Industries Type DNSB.
C. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(9mm) sponge cemented to the vertical leg. Angle Brackets shall
be Mason Industries Type AB-716.
2.02 Bond Breaker Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average. PVC
foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the EAFM mountings
and sized for a maximum deflection of 0.2”(5mm) at maximum earthquake forces. Interspersed pads shall be Mason Industries Type
LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Floor Drains
A. Cast iron design. The upper funnel section cast into the floating floor.
Lower bucket, built into the structure, shall retain water surrounding
the upper section as a between floors sound seal. Weep holes are
required to drain the structural floor. Floor drains shall have water
proofing membrane clamps. Floor drains shall be Mason Industries
Type CFD-18591.
2.06 Plywood
A. Type AC exterior grade 1/2”(12mm) thick.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation and adjustment procedures and drawings submitted by the isolator manufacturer
and approved by the architect.
––––––––––––––––––– End of Specification ––––––––––––––––––
2. The floating roof slab shall be isolated from adjoining walls and
curbs by means of perimeter isolation.
3. Any floor drains, piping, conduit and duct penetrations must not
short circuit the isolation system.
4. Any equipment on the roof shall be mounted on housekeeping pads
or directly on the floating roofs as shown on the drawings, and
installed so as not to damage the roof’s waterproofing.
5. In seismic zones the floating floor shall be restrained horizontally by
curbs or walls designed to withstand the horizontal seismic forces.
Solid bridge bearing LDS pads shall be interspersed between
perimeter isolation to withstand the seismic forces with a maximum
deflection of 0.2”(5mm). When perimeter cannot be used for seismic constraint, intersperse horizontal restraints within floor system.
6. In seismic zones 2, 3 and 4 or equivalent Av, the floor shall be protected by embedded double acting resilient floor snubbers set in
opposition to the overturning moments at the equipment snubbers
in all locations where the center of gravity of major equipment is
high.
B. Performance Requirements
1. The floating roof system shall have a minimum rating of STC 79 and
INR+17 as verified by an independent laboratory in prior tests.
C. Roof System Construction Procedure
1. The setting of all isolation materials shall be performed by or under
the supervision of the isolation manufacturer.
2. Set and waterproof any drains and lower pipe seals in keeping with
waterproofing specifications.
3. Cement perimeter isolation around all walls, columns, curbs, etc.
3a. In seismic zones intersperse the perimeter isolation with bridge
bearing quality LDS pads the thickness of the perimeter isolation.
4. Place individual LDS isolators on the sub-floor at a maximum spacing of 24”(600mm) in strict accordance with the approved drawings
prepared by the isolation manufacturer. Additional reinforcement
must be detailed on isolation manufacturer’s drawings when
required.
If sound barrier isolation walls are used, add the following:
Perimeter isolators shall be selected to support the wall weight in
addition to the perimeter of the floating roof.
5. In seismic zones provide anchorage for the double acting resilient
vertical snubbers to the structural slab. Snubber anchor bolts must
be in close proximity to the mechanical snubbers restraining any
high center of gravity equipment to withstand the overturning
moments generated by the machinery snubbers and prevent failure
of the floating floor.
6. Cover isolators with 1/2”(12mm) AC plywood. Isolators shall be
located under joints and joints staggered. Connect plywood at abutting edges and corners with 16 gauge steel junction plates.
LDS FORM-WORK SYSTEM FOR ROOFS
7. Cover the plywood with polyethylene sheeting and carry it up the
walls past the perimeter isolation.
PART 1 - GENERAL
8. Place seismic snubber housings on anchor bolts that protrude from
the structural floor and through the plywood.
Download This Specification
1.01 Description
Download All Product Details
A. Scope of Work
1. Isolate floating roofs from the building structure by means of LDS
isolators under plywood panels and perimeter isolation as shown on
the drawings.
If sound barrier walls are used, add the following:
2. Build sound barrier walls on the floating floors.
B. Substitution of Materials
1. Substitute materials shall meet or exceed the “quality” of the products which are listed in these Specifications. Submit samples and
test reports by an independent laboratory for consideration on this
project.
1.02 Design
A. Intent
1. The floating roof shall consist of a 4”(100mm) thick concrete slab
isolated from and supported 21/2”(62mm) above the waterproof
structural slab by resilient LDS isolators covered by plywood panels
that form the pouring surface.
If sound barrier walls are used, add the following:
Sound barrier walls consisting of 6”(150mm) filled concrete block
(Barrier wall construction can be changed when writing specification) shall rest on the floating floor.
9. Place reinforcing as shown on the drawings and pour floor monolithically.
10. After the concrete has hardened, caulk all perimeter isolation.
If sound barrier walls are used, add the following:
11. Construct block walls on the floating floor being careful that mortar
does not drop behind the walls.
12. Perimeter roofing shall be done to allow for 0.5”(12mm) of downward movement without leakage.
13. In seismic zones adjust the double acting snubbers after machinery
is in place to provide a maximum up and down clearance of
0.125”(3mm).
D. Submittals
1. Detailed product drawings and load /deflection curves of all isolators and in seismic zones double acting floor snubbers.
2. AASHTO Test Reports on all properties in table 2.01 A from an
accredited independent laboratory for all rubber durometers used.
3. Dynamic stiffness test from an accredited independent laboratory at
5, 10 and 15 Hz, showing dynamic stiffness does not exceed 1.4.
3a. Isolation frequency not to exceed 9 Hz at stated deflection.
4. Acoustical test data from an independent laboratory showing a minimum STC of 79 and a minimum INR of 17 using a 4”(100mm) concrete floating floor, a 6”(150mm) structural floor and a 2”(50mm) air
gap.
17
LDS FORM-WORK SYSTEM for ROOFS specification concluded
Business
Cardshowing:
5. A drawing
or drawings
Logo
a. Dead, live and concentrated loads.
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
b. Isolator sizes, deflections, frequencies and locations and in
seismic zones, locations of seismic snubbers.
c. Any drain and penetration locations.
d. Size, type, elevation and spacing of concrete reinforcement.
e. Caulking details.
f. Floating roof and wall construction procedure.
1.03 Quality Assurance
A. Floating roof system components shall be designed and fabricated
by a manufacturer of at least ten years experience in one hundred
similar floating floor installations.
B. The floating roof isolation materials and panel board forms shall be
installed under the supervision of the isolator manufacturer.
1.04 Site Conditions
A. If site conditions are unsatisfactory or raise questions about the
installation of the floating floor, the work will not proceed until the
condition has been corrected in a manner acceptable to the isolation manufacturer. The sub-floor must have the same pitch as the
top of the floating roof or special provisions made for isolator housings of different height.
1.05 Sequencing and Scheduling
Coordinate work with other trades and coordinate scheduling with the
construction supervisor to minimize delays.
2.01 Isolators
A. Cylindrical LDS mountings with a diameter no less than 0.9 of the
2” (50mm) height. Isolators are molded to the following LDS AASHTO bridge bearing specification. Maximum durometer 60.
Deflections shall not exceed 0.3”(7.5mm) nor the frequency 10Hz.
Isolators shall be Mason Industries Type EAFM.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
2.02 Plywood Cover Material
A. Provide one (1) layer of 6 mil (0.15mm) polyethylene sheeting over
the plywood.
2.03 Perimeter Isolation
A. Minimum 3/4”(20mm) thick PVC foam, density 7 lbs/ft3 average.
PVC foam shall be Mason Industries P7.
B. In seismic zone perimeter isolation shall be interspersed with
3/4”(20mm) thick, 60 durometer LDS bridge bearing pads the height
of the perimeter material. Bridge bearing pad shall be made to the
same AASHTO specifications, as shown for the EAFM mountings
and sized for a maximum deflection of 0.2”(5mm) at maximum
earthquake forces. Interspersed pads shall be Mason Industries
Type LDS-BBP.
2.04 Perimeter Caulking Compound
A. Non-hardening, drying or bleeding. Troweling or pouring grade.
Caulking compound shall be Mason Industries Type CC-75.
2.05 Floating Roof Drains
PART 2 - PRODUCTS
ORIGINAL PHYSICAL
PROPERTIES
B. In seismic zones double acting resilient cast in floating floor snubbers shall consist of a ductile iron housing locked into the floating
floor. The housing shall have a removable cover plate to provide
access to the adjustment of clearances in both the up and down
directions of the resilient stops. Resilient stops shall be attached to
a restraining bolt attached to the structural floor with an approved
anchor. Double acting snubbers shall be Mason Industries Type
SFFS.
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
ROOFING TO
ALLOW FOR 0.5”
DOWNWARD
MOVEMENT
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
ARCHITECT’S
ROOF DRAIN
(Not by Mason)
A. Floating roof drains shall be selected by the architect. A hole large
enough to allow passage of the drain piping shall be left in the structural roof. Drain piping shall be suspended from combination spring
and LDS hangers with a minimum of 1”(25mm) static deflection for
40 feet (12 meters) from the attachment point as shown on the
drawings.
B. Floor drains shall be (Architects preference).
2.06 Plywood
A. Type AC exterior grade 1/2”(12mm) thick.
PART 3 - EXECUTION
3.01 Installation
Install the floating floor systems according to the installation procedures
and drawings submitted by the isolator manufacturer and approved by
the architect.
WATERPROOFING
FLOATING
ROOF
LDS
JACK-UP OR
EAFM ISOLATION
STRUCTURAL
FLOOR
CLEARANCE
HOLE IN
SUB-FLOOR
SPRING &
LDS
HANGERS
FSN JACK-UP OR EAFM PANEL SYSTEM USING STANDARD ROOF DRAIN
18
ISOLATED
DRAIN PIPE
SPRINISOLATED WALLS discussion
Walls are isolated to prevent flanking around floating floors or to improve the STC between adjacent spaces.
FLANKED FLOOR
FLOATING
FLOOR
SUPPORTED
WALL
The word “flanking” is used to describe a vibration or noise path that goes around an isolated
component. If a structure is built with continuous walls so that in cross section it is as an H and
we introduce a floating floor, the STC of the system will probably remain at only 60 or 63 regardless of the floor’s rating. Sound energy vibrates the walls and this vibration continues in wave
form to the lower spaces where the wall reintroduces the sound. This is flanking or bypassing
the floating floor. The difference in results is shown in Test Two as opposed to Test One in the
beginning of our discussion on page 3. The floor constructions were exactly the same. In Test
One, however, the sound impinged directly on the walls and ceiling without the isolated barrier
walls and ceiling used in Test Two.
To complete an envelope, secondary walls must be introduced with the same consideration
given to mass and air gap as covered in the floor discussion. The problem is simpler, because
the walls normally support only their own weight and they need not have the structural strength
of the floor. Poured concrete or concrete block walls should approach the floor density. It is most
important that block joints are properly filled with mortar and painting the walls so the construction is more nearly airtight helps.
The best approach is resting these walls on the perimeter of the floating floor so the floor isolation system serves the walls as well. If this is not possible, the second choice is supporting the
isolated wall on the structural slab with continuous neoprene pads, and providing a caulked fiberglas seal between the floating floor and the wall as described for the perimeter in the previous
specifications.
If the wall is so high as to be unstable it must be protected against buckling or toppling by means
of resilient sway braces anchored to the structural walls. Sway braces are mandatory for all independent walls resting on pads if they are not locked at the top. Braces are normally placed 4’
apart horizontally with the vertical spacing of rows dependent on the height and thickness of the
wall. It is seldom that more than two rows of braces are required.
Occasionally we have used double acting springs for sway braces in conjunction with spring
mounted floors. In most cases, however, our recommended design is the neoprene Type DNSB
as illustrated on page 20. When space is limited, the WIC clip is the logical alternate. (Page 20)
Yet another variation, Type WCL, consists of a channel shaped bracket that is lined with 5/16”
neoprene waffle pad and a 1/4” thick felt backing. With this arrangement the bracket is bolted to
the structural wall so that horizontal steel furring can be laid in the isolated pocket as illustrated.
(Page 20)
STRUCTURAL
FLOOR
SUPPORTED
WALL
When we did our test work at Riverbank, we did not place lightweight fiberglas fill between the
walls of our inner room and the walls of the laboratory. Concrete short circuited the air gap and
we had to break it out. Therefore, under Construction Procedure you will find that we have said
that “special care must be taken to completely butter all joints and concrete must not be allowed
to drop behind the wall and short circuit the air gap”.
If you wish to be more cautious about concrete droppings, you can call for 1 1/2” or 2” thick three
pound minimum density fiberglas to fill this vertical void. Call for the fiberglas in the materials
portion of the specification and then in the construction procedure advise the contractor to
cement the fiberglas to the structural wall in advance of the placing of the concrete blocks. Thus,
the fiberglas will serve to prevent accidental short circuiting of the air gap. It is primarily a
mechanical rather than an acoustical aid.
TYPICAL LIGHTWEIGHT
WALL BRACE AND SUPPORT
Test Three
BROADCASTING STUDIO
Frequency
(Hz)
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
FSTC
INR
Transmission
Loss (dB)
47
48
50
54
60
66
71
79
85
90
95
92
92
71
+24
Cerami Field Test 2501, July 1, 1974
We must also be concerned with sound leakage over the top of the wall. If a wall is short and
rigid and need not be locked at the top, the least expensive approach is the inclusion of a fiberglas pad over the last course of masonry with acoustical caulking on both sides of the pad. In
most cases, it is easier to both lock the walls in place and seal them by the use of continuous
angle brackets type AB-716 which are placed on both sides of the wall as illustrated on page 20.
If the walls are stable and it is possible to rest the floating ceiling on the floating walls to complete the box, there is no need for these top details.
When an isolated wall abuts the rigid structure, it is usual to place a fully caulked strip of fiberglas or 1/2” neoprene sponge at the end to prevent short circuiting. AB-716 angle braces can be
used vertically as well for locking purposes or a caulked vertical section of channel iron lined with
1/2” neoprene sponge makes another neat joint as the wall fits between the flanges.
If some lesser STC values are satisfactory, it is not necessary to use masonry. Good results can
be obtained with gypsum board walls or various of the prefabricated acoustical partitions as
shown by Test Three of a small broadcasting studio using a 4” jack-up concrete floor, gypsum
board walls on three sides and an isolated ceiling. You will note that rather than the 79 STC
obtained with the 2” air gap in the Riverbank Test, this room came in at FSTC 71 with an INR of
plus 24. These are excellent results and probably more than satisfactory for most situations. This
less expensive construction should certainly be considered. The type WCL clip was used to
resiliently support horizontal runners and we had included fiberglas behind the walls as always
for lightweight construction.
Isolated walls are often used without floating floors to reduce sound transmission between adjacent spaces. Here the floor provides a possible flanking path, but if results in the STC 60 range
are satisfactory this is certainly a valid technique. All of the wall specifications are meant to be
used with or without the floor specifications as required.
19
SPRINISOLATED WALLS RESTING ON FLOATING FLOOR specification
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PRODUCT DETAILS
CAULK
DNSB Sway Braces
50
400
B
250
1200
A
(in)
B
(in)
C
(in)
2
21/2
3
3
33/4
21/2
Bolted
End for
Steel
Studs
C
Wall must be supported at the base. Theoretical
horizontal load is zero and assigned maximum
weight is limited by possible development of
buckling or overturning forces.
CONCRETE
BLOCK
WALL
Alternate Hooked
End for Masonry
WIC Sway Braces
DNSB
SWAY
BRACE
A
Min Braced
Weight to
Establish
15Hz
(lbs)
Assigned
Max Weight
per Brace
(lbs)
A
(in)
50
100
250
500
1
2
33/4”
Wall must be supported at the base. Theoretical
horizontal load is zero and assigned maximum
weight is limited by possible development of
buckling or overturning forces.
13/4”
WCL Sway Braces
FLOOR IN
RAISED
POSITION
NOTE: The floating floor specifications already include provision for
floating walls. The following independent specification is provided for
additional clarity.
MASONRY WALL ISOLATION, WALLS RESTING ON FLOATING
CONCRETE FLOOR
Download This Specification
A. Scope
Isolate masonry walls shown on drawings from building structure
by supporting them on the floating concrete floor. Brace them with
resilient sway braces and anchor the top by means of resiliently
lined angle iron guides.
B. Materials
Download All Product Details
1. Wall Sway Braces: Double acting neoprene sway braces with a
fail safe feature in three planes. Braces shall be furnished with a
bracket for bolting to the structural wall and a hooked end for
insertion in the masonry joint. Braces shall have a frequency not
in excess of 10Hz based on the weight of the wall area per brace
and a vertical stiffness not in excess of 50% of the horizontal.
2. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(10mm) sponge cemented to the vertical leg.
3. Caulking Compound: Non-hardening, non-drying and non- bleeding.
C. Wall System Construction Procedure
1. If the drawings call for sway braces, raise the floating floor to operating position before attaching the first row of sway braces to the
walls. If no sway braces are used, construct the walls before raising floor if walls do not cover isolator access.
20
Min Braced
Max
Weight to Assigned
Establish
Wall
10Hz
Weight
(lbs)
(lbs)
AB-716
ANGLE
BRACKETS
A
Min Braced
Weight to
Establish
15Hz
(lbs)
Assigned
Max Weight
per Brace
(lbs)
100
500
31/4”
1” plus runner
width or as req’d
SWW
AB-716 Angle
Wall Isolators
Brackets
16 gauge
Steel
2”
24”
11/2”
Two 5/16”
Waffle Pads
2”
3/8” Sponge
2. Build concrete block wall on perimeter of floating floor leaving a
31/2”(90mm) gap between the building wall and the floating wall.
(31/2”(90mm) may be reduced to 2”(50mm) if no sway braces are
needed.)
3. Cement 2”(50mm) fiberglas to the structural wall. When buttering
all joints, concrete should not be allowed to drop behind the wall
and short circuit the air gap. The fiberglas will prevent accidental
droppings.
4. Set sway braces as shown on drawings and anchor hooks in mortar joints.
5. Bolt one angle bracket to structural ceiling with sponge leg facing
new wall.
6. Continue construction to ceiling leaving a minimum gap of
1/2”(12mm) on top with the floating floor elevated. Check to be
certain gap is continuous.
7. Secure other angle to structural ceiling with sponge leg vertical and
bearing on wall. Angles shall be continuous on both sides of wall.
8. Caulk all accessible joints.
D.
1.
2.
E.
Submittals
Load and deflection curves of all sway braces in both planes.
Detailed drawings of angle braces.
Manufacturer
1. Subject to compliance with the specifications, the following products are approved for use: Type DNSB Sway Braces,
AB-716 Angle Braces and CC-75 Caulking Compound all as manufactured by Mason Industries, Inc.
SPRINISOLATED MASONRY WALLS ON STRUCTURAL FLOOR and
GYPSUM BOARD WALL specifications
The method below is used when walls are extremely tall and heavy so
that support on the floating floor becomes impractical. There are also
installations where only adjacent space must be protected and no
floating floor is required.
quency not exceeding 15Hz based on the total weight of the wall area
per brace”. Under materials and manufacturer they should be referred
to as type WIC rather than DNSB.
MASONRY WALL ISOLATION, WALLS RESTING ON ISOLATION
PADS.
Download This Specification
A. Scope
Isolate masonry walls shown on drawings from building structure
by supporting them on two 5/8”(16mm) thick neoprene isolation
pads, bracing them with resilient sway braces and anchoring the
top by means of resiliently lined angle iron guides.
B. Materials
Download All Product Details
1. Wall Isolation Pads: Two layers of 5/16”(8mm) thick neoprene
waffle pad molded to the following AASHTO Table B properties
and cemented to a 16 gauge sheet metal form cut to the full width
of the wall. Sections shall be furnished 6’(2m) long with corrugated steel anchors riveted or welded to the plates to facilitate
anchoring of the walls. Waffle pad may be cut in lengthwise strips
to reduce area and allow for the proper deflection. Dynamic frequency shall not exceed 14Hz.
ORIGINAL PHYSICAL
PROPERTIES
TESTED FOR AGING
OVEN AGING(70h/212°F)
OZONE
COMPRESSION SET
ASTM D-573
Tests: ASTM D-676 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
Hardness
(max)
Tensile
Strength
(max)
40±5 2000 psi 450%
50±5 2500 psi 400%
60±5 2500 psi 350%
+15%
+15%
+15%
±15%
±15%
±15%
ASTM D-1149
ASTM
D-395
Elongat. 1 ppm in air
at Break by Vol.20% 22hrs 158F°
(max)
Strain 100F° Method B
-40%
-40%
-40%
No Cracks
No Cracks
No Cracks
30%(max)
25%(max)
25%(max)
2. Neoprene Cement
3. Wall Sway Braces: Double acting neoprene sway braces with a
fail safe feature in three planes. Braces shall be furnished with a
bracket for bolting to the structural wall and a hooked end for
insertion in the masonry joint. Braces shall have a frequency not
in excess of 10Hz based on the weight of the wall area per brace
and a vertical stiffness not in excess of 50% of the horizontal.
4. Angle brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provision for bolting to the structure and a minimum thickness of
3/8”(10mm) sponge cemented to the vertical leg.
5. Caulking Compound: Non-hardening, non-drying and non- bleeding.
C. Wall System Construction Procedure
1. Strike lines on the floors and cement the 6’(2m) long wall supports
in position with neoprene cement.
2. Cement 2”(50mm) fiberglas to the structural wall.
3. Lay the first course of blocks being certain to bend up the corrugated anchors to embed them in the mortar joints.
4. Build up the concrete wall taking special care to completely butter
all joints. Where sway braces are used, leave a 31/2”(90mm) gap
between the acoustical wall and the building structure. Do not
allow mortar to drop behind wall and short circuit the air gap. The
2”(50mm) fiberglas will help prevent short circuiting.
5. Set sway braces as shown on drawings and anchor hooks in mortar joints.
6. Bolt one angle bracket to structural ceiling with sponge leg facing
new wall.
7. Continue construction to ceiling leaving a minimum gap of
1/2”(12mm) on top. Check to be certain gap is continuous.
8. Secure other angle to structural ceiling with sponge leg vertical
and bearing on wall. Angle shall be continuous on both sides of
wall.
9. Caulk all joints.
D. Submittals
1. Load and deflection curves of all sway braces in both planes.
Load and deflection curves of wall isolation pads. Detail drawings
of angle braces.
E. Manufacturer
1. Subject to compliance with the specifications, the following products are approved for use: Type SWW Wall Isolators, DNSB Sway
Braces, AB-716 Angle Braces and CC-75 Caulking Compound. All
as manufactured by Mason Industries, Inc.
NOTE TO ARCHITECT:
When you cannot leave a 31/2”(90mm) gap between the isolated wall
and the basic structure, it is necessary to use a stiffer type of sway
brace as the neoprene materials must be made thinner. If there is an
inch and a half gap, the item can be defined as a “Double acting neoprene sway brace consisting of two interlocking metal sections separated by 5/16”(8mm) thick neoprene waffle pad with a horizontal fre-
CONCRETE BLOCK
PAD SUPPORT
GYPSUM
3 1/2” AIR GAP
GYPSUM
2” AIR GAP
Gypsum walls are used to reduce weight and cost when lesser performance remains acceptable.
GYPSUM BOARD FLOATING WALLS RESTING ON FLOATING
FLOORS
The following specification is meant as a general guide for the
construction of gypsum board or similar sound barrier walls. There
are so many variations in construction that our specifications can
only be very broad and must be specifically tailored to each individual application.
Download This Specification
A. Scope
1. Isolation of gypsum board walls from building structure by putting
them on the floating concrete floor, bracing them with resilient
sway braces and establishing a sound seal either at the structural or acoustical ceiling.
Download All Product Details
B. Isolation Materials
1. Wall Sway Braces: Double acting neoprene sway braces with a
fail safe feature in three planes. Sway braces shall be made with
a bracket for bolting to the building structure and a projecting
anchor bolt with adjusting nuts for plumbing the wall structure.
Sway braces shall have a horizontal frequency not in excess of
10Hz based on the weight of the wall area per brace and a vertical stiffness not in excess of 50% of the horizontal.
2. Angle Brackets: 11/2”(40mm) x 2”(50mm) angle iron sections with
provisions for bolting to the structure and a minimum thickness of
3/8”(10mm) sponge cemented to the vertical leg.
3. Caulking Compound: Non-hardening, non-drying and non-bleeding.
4. One and a half to three pound density fiberglass 2”(50mm) thick.
C. Wall System Construction Procedure
1. Raise the floating floor to operating position before constructing
walls. Bolt the wall foot channel to the perimeter of the floating
floor and set the vertical channels in position.
2. Bolt the sway braces to the structural wall as shown on the drawing and use the leveling nuts to plumb the channels and set them
in their vertical position.
3. Attach 2”(50mm) fiberglas to building walls.
4. Add horizontal steel members in the normal manner and cover
entirety with two layers of 3/4”(20mm) gypsum board staggering
and overlapping all seams.
5. Where drawings indicate, gypsum board terminates at the structural ceiling, stop the gypsum board 1/2”(12mm) short of the ceiling and lock in place with the 11/2”(40mm) x 2”(50mm) isolation
angles on either side with the sponge rubber facing the gypsum
board.
6. Where the gypsum board forms a seal with the isolation ceiling,
terminate the gypsum board as shown on the details without the
angle iron braces.
7. Caulk all joints.
D. Submittals
1. Submittals shall include load and deflection curves of all sway
braces.
E. Manufacturers
1. Subject to compliance with the specifications the following products are approved for use: Type DNSB Sway Braces as manufactured by Mason Industries, Inc.
21
SPRINISOLATED SUSPENDED CEILINGS discussion
PRODUCT DETAILS
WHD Neoprene Hangers
B A
C
Load Range
(lbs)
Up to 125
Up to 650
A
(in)
23/4
41/2
B C C
(in)
(in)
41/8 2
7
41/4
W30 Spring Hangers
BA
C
30°
Load Range
(lbs)
12 to 95
138 to 336
A
(in)
41/2
43/8
B
(in)
71/4
73/8
C
(in)
23/4
4
W30N Neoprene & Spring
Hangers
B A
C
There are two types of resiliently suspended ceilings.
The most common is a lightweight mechanical ceiling that contains the lighting fixtures, the outlets for
the air conditioning system, etc. These lightweight ceilings consist of light steel framing drop-in absorptive tiles that are generally 24”x24” or 24”x36”. The primary purpose is to absorb sound within the room
and to lower the reverberation rate. Because the material is so light, there is virtually no reduction in
transmitted noise either in or out of the room.
Acoustical barrier ceilings are entirely different. In years past they might have been plaster on wire
lathe, but modern construction is two layers of 5/8” gypsum board screwed together with staggered
joints. Every effort is made to seal the perimeter as well as any penetrations. While these ceilings are
still lightweight as compared to concrete floating floors, they do have sufficient mass to act as sound
barriers and the fact that they are carefully caulked and sealed puts them in a totally different category than the mechanical ceilings described above.
Barrier ceilings are primarily used to reduce noise transmission from the floor above. In most cases an
architect will choose either a floating floor in the equipment room or a barrier ceiling in the space below.
However, the two methods are sometimes used in conjunction with one another.
In other applications the ceilings help contain noise. Thus, an equipment room may have a suspended
ceiling to complete the isolated wall and floor design. This is a common procedure for adjacent music practice rooms, particularly when the double partition walls do not reach all the way to the structural ceiling.
Barrier ceilings are light as compared to floating concrete floors, so the effectiveness of the ceiling is
far more dependent on the air gap than mass or rigidity. Since the air must allow for the inclusion of the
hangers and support steel, a minimum air gap is about 12”. Lightweight fiberglas bats are placed over
the barrier ceiling to further improve the performance.
The building service ducts, electrical conduits, etc., pass beneath it and above a removable tile
mechanical acoustical ceiling. The acoustical hangers are located in the supporting rods or wires common to both ceilings. When the barrier ceiling is penetrated by wires, rods or straps, these members
must be isolated by means of resilient sleeves and they should be caulked as well.
While the double ceiling method is probably the most effective approach to the problem, vibration hangers are commonly used to support single ceiling systems as well. If the single ceiling is of the sound barrier type, the vibration isolator helps to prevent the passage of structural noise just as in the case of the
double ceiling. Hangers used to support simple mechanical ceilings prevent rattling of the ceiling members.
A mounting that “looks into” or rests on a rigid structure has a simpler task than one working against
something that is flimsy. In the case of floating floors, the neoprene isolators or springs rest on the main
structure, which is comparatively rigid. In the case of ceiling hangers, we often start with the noise and
vibration at the concrete building structure and move down a rod or wire to the vibration control hanger and then on to the suspended ceiling. Under the best of circumstances, when this is a plastered ceiling, it is still a very flexible diaphragm without concentrated mass as compared to the concrete floor
that a floor mounting rests on. Therefore, a hanger must be very carefully designed or it will not have
the comparative flexibility to do the job.
Very little test work has been done to show the effectiveness of acoustical ceilings using isolation hangers. In 1969 we tested lightweight components. We started with a 3” gypsum concrete floor with an STC
of 41 and suspended a single 5/8” gypsum board ceiling using W30N hangers with 1” static deflection.
The air gap was 12” . The STC went up to STC 50 for an improvement of nine as tabulated in Test Four.
Most ceilings are made up of two layers of 5/8” gypsum board with lightweight fiberglas bats laid over the
top. Therefore, it is safe to assume that the average barrier ceiling provides an improvement of STC 14.
30°
Load Range
(lbs)
12 to 95
138 to 336
A
(in)
51/2
81/4
B
(in)
10
11
C
(in)
31/2
43/4
Test FOUR
TRANSMISSION LOSS TEST
(KAL-714-9-69)
Lightweight 3” Lightweight
FreGypsum Gypsum Floor
quency 3” Floor
& Suspended
(Hz)
Only
5/8” Ceiling
125
27
35
160
26
32
200
31
36
250
32
39
315
30
39
400
33
43
500
38
47
630
38
50
800
41
53
1000
43
57
1250
44
59
1600
45
64
2000
48
67
2500
51
69
3150
51
71
4000
54
76
STC
41
50
5/8” Gypsum board ceiling suspended
12” below 3” gypsum concrete floor and
hung from W30N hangers.
22
We manufacture a very wide range of ceiling hangers in order to be competitive when other vendors
are specified. In this bulletin, however, we are discussing only three major categories consisting of the
WHD, W30 and W30N. Our suggestions are as follows:
Series WHD - Simple neoprene vibration hangers are used in low budget applications or for those
installations where it has been clearly established that there is little or no structural vibration. The hangers serve as noise breaks only, as static deflection is limited.
Series W30 - Steel coil spring vibration hangers are far superior to the neoprene designs because the
higher deflection spring element will serve to isolate building vibration. The design includes a neoprene
cup in series with the spring that acts as a partial high frequency noise barrier.
Series W30N - Combination hangers make use of the WHD neoprene element in series with the W30
spring. Thus the design combines the best features of the all neoprene and the spring hangers and we
recommend them for all critical applications.
15° Misalignment Tolerance - Both our spring and combination spring and neoprene hangers are
designed so that the hanger rod or wire can be off vertical by as much as 15° without rubbing on the
steel hanger box and transmitting noise. We continue to manufacture lower priced competitive hangers that do not have this angular tolerance, but we invented the 30° sweep design, because most field
problems stem from a contractor’s difficulty in lining up what may be hundreds of hangers perfectly. If
they do not, the wires and rods rub.
Precompression - We strongly recommend that all spring hanger installations have the spring elements partially precompressed at the factory before they are installed. If the springs are not precompressed, the ceiling will descend as much as an 1” when the spring deflects as weight is added. The
contractor will have great difficulty in preventing cracks in plaster ceilings or finishing with a flat ceiling
at the proper elevation. When the spring hangers are precompressed 70% of the total travel, the ceiling will not descend at all until the installation is about completed and the travel will only be 0.30” to
completion.
The architectural drawings should show the construction of the isolated ceilings and the spacing of the
ceiling hangers. They are usually on 48” centers in both directions. The hanger most commonly used
on our jobs and our standard recommendation is the Type W30N. Under Materials and Manufacturer,
however, we have repeated the specification for each type so you can select your preference. Since
the construction procedure is the same in all cases, it was pointless to keep rewriting the same specification over again. By the same token, the specification can be changed slightly to cover any type of
construction such as a sand plaster ceiling or a simple acoustical tile ceiling by substituting your materials where we call for two layers of 5/8” Gypsum Board.
SPRINISOLATED SUSPENDED CEILINGS specification
CEILING
HANGER
CEILING
SUPPORT
WIRES
DUCT
FIBERGLASS
BATS
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DUCT
CAULK
CONSTRUCTION PROCEDURE STEP 2.
AVOIDING AN INTERFERENCE.
STEEL
CEILING
GRID
ISOLATED CEILINGS SUSPENDED BY RESILIENT HANGERS
Download This Specification
A. Scope
To prevent the transmission of noise and vibration through the
ceiling hangers and the suspended ceiling.
B. Materials
Download All Product Details
(Select one of the following as 1)
1. Combination Neoprene Element and Spring Hangers: Hangers
shall consist of a steel frame containing a neoprene isolation element at the top and a coil steel spring seated in a neoprene cup
on the bottom. Both the element and the cup shall be molded with
a neoprene bushing that passes through the steel frame. The neoprene element shall be capable of a minimum deflection of
0.23”(6mm) and the steel springs selected from a 1”(25mm) static deflection series with a minimum additional travel to solid of
1/2”(12mm). Spring diameters and hanger box lower hole size
shall be large enough to permit the hanger rod to swing through a
30° arc before contacting the box and short circuiting the spring.
Hangers shall be selected for a minimum of 0.75”(20mm) spring
deflection and factory precompressed 70% of the total deflection
determined by the assigned load per hanger. Hangers shall be
manufactured with provision for bolting or attaching to the ceiling
flat iron straps, wire, rods or steel runners. Hangers shall be fail
safe.
1. Spring Hangers: Hangers shall consist of a steel frame containing
a coil spring seated in a neoprene cup. The cup is molded with a
rod isolation bushing that passes through the hanger frame.
Hangers shall be selected from a 1”(25mm) static deflection
series with a minimum additional travel to solid of 1/2”(12mm).
Spring diameters and hanger box lower hole size shall be large
enough to permit the hanger rod to swing through a 30° arc before
contacting the box and short circuiting the spring. Hangers shall
be selected for a minimum 0.75”(20mm) spring deflection and factory precompressed 70% of the total deflection determined by the
assigned load per hanger. Hangers shall be manufactured with
provision for bolting or attaching to the ceiling flat iron straps,
wires, rods or steel runners. Hangers shall be fail safe.
1. Neoprene Hangers: Hangers shall consist of a steel frame containing a neoprene isolation element molded with a rod isolation
bushing that passes through the hanger frame. Deflections shall
be a minimum of 0.23”(6mm) and a maximum of 15% of the elements height. The dynamic frequency shall not exceed 10Hz. The
isolation elements shall be molded to the following AASHTO Table
B bridge bearing properties. Hangers shall be manufactured with
provision for bolting or attaching to the ceiling flat iron straps,
wires, rods or steel runners. Hangers shall be fail safe.
ORIGINAL PHYSICAL
PROPERTIES
TESTED FOR AGING
OVEN AGING(70h/212°F)
OZONE
COMPRESSION SET
ASTM D-573
Tests: ASTM D-676 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
Hardness
(max)
Tensile
Strength
(max)
40±5 2000 psi 450%
50±5 2500 psi 400%
60±5 2500 psi 350%
+15%
+15%
+15%
±15%
±15%
±15%
ASTM D-1149
ASTM
D-395
Elongat. 1 ppm in air
at Break by Vol.20% 22hrs 158F°
(max)
Strain 100F° Method B
-40%
-40%
-40%
DUCT
HANGERS
No Cracks
No Cracks
No Cracks
30%(max)
25%(max)
25%(max)
GYPSUM
BARRIER
CEILING
ACOUSTICAL
CEILING TILE
2.
3.
C.
1.
Closed cell neoprene sponge 1/4”(6mm) thick.
One and a half to three pound density 2”(50mm) thick fiberglas.
Isolated Ceiling Construction Procedure.
Lay out ceiling support wires on 48”(1220mm) centers in both
directions.
2. Where ducts or other mechanical interferences occur, a rigid steel
trapeze can be run under the interference and a ceiling hanger
hung from the trapeze to maintain the 48”(1220mm) centers.
Where head room does not allow for this, the steel trapeze can be
installed with an isolation hanger on each end and a ceiling wire
hung from the trapeze to the floating ceiling.
3. Install isolation hangers making certain that hangers are vertical
and that they do not rub against pipe, duct, ceiling beams or other
interferences.
4. Connect wires to lower end of hangers and proceed with steel
ceiling grid construction in the normal manner. Attach the first
layer of 5/8”(16mm) gypsum board to the ceiling steel covering the
upper surface of the gypsum board with 2”(50mm) fiberglas bats
as completely as possible.
5. Attach the second layer of 5/8”(16mm) gypsum board being certain to stagger the joints in all cases.
6. Install lightweight angles around the perimeter of the ceiling by
bolting one leg to the wall and resting the 1/4”(6mm) neoprene
sponge on top of the horizontal leg so as to provide a support for
the perimeter.
7. Caulk the perimeter.
8. When an acoustical tile ceiling is to be used below the sound barrier ceiling, continue the hanger wires to the acoustical ceiling and
caulk all hanger wire penetrations where they pass through the
gypsum ceiling.
9. Where mechanical equipment, pipes or ducts fall below the barrier ceiling, provide additional hangers that are not connected to the
barrier ceiling for this equipment and sponge sleeves where these
rods pass through the barrier ceiling. Caulk the perimeter of all
sleeves.
10. Continue with the construction of the acoustical tile ceiling in the
normal manner.
D. Submittals
1. Load and deflection curves of all hangers. Certification of the neoprene compound to the AASHTO specifications as well as the
Dynamic Frequency.
(Use 2 for W30N or W30 only)
2. A full scale drawing of the hangers showing the minimum 30° contact arc in all planes. Submittals shall include compressed spring
height and spring rates.
E. Manufacturer
Subject to compliance with the specifications, the following products are approved for use: (Select One) (Type W30N Combination
Spring and Neoprene Hangers.) (Type W30 Spring Hangers.)
(Type WHD Double Deflection Neoprene Hangers) as manufactured by Mason Industries, Inc.
23
SPRINWOODEN FLOATING FLOORS discussion & specification
It is often necessary to provide a wooden floating floor rather than the heavier concrete conPRODUCT DETAILS
Business
struction with wood topping.
Cost or Card
weight restrictions may be the factor. In older buildings it is
often necessary to improve on Logo
existing floors with a lightweight impact noise resistant construc- ND Double Deflection LDS Mounts
tion. A resiliently supported wooden floor will reduce the rumbling noise of a bowling ball, the click,
click of a woman’s heels and that portion of a typical noise generated by a piano that travels down Height Saving D
Simpler ND
the piano legs and into the structure. It will offer only minor reduction of airborne sound, as there ND Mounting
Mounting Position
is insufficient mass in the surface. In some applications on stages or in rehearsal rooms the priPosition
mary purpose is relief and comfort for the dancers. Landing on concrete or hard mounted wood
1” Wood
surfaces is very damaging to a dancer’s feet and legs.
5/8”
Nail
We have run some tests on INR and IIC as noted below, and hope to run other tests on STC, but
have not done so at this writing. We have seen meaningful results, however, using this construction under judo rings, rehearsal dance floors, bowling alleys, gymnasium floors and high
A
school machine shops.
C
B
In most cases, we have used our type ND mountings, and occasionally our type MFS spring
designs. We have included a typical specification using the ND mountings and prefer not to write a
Lowest
general specification for springs, as spring selections are very construction dependent. Please let
Load
Max Dynamic
Range
Defl.
Freq.
A
B
C
D
us help you specifically on direct mounted spring applications.
(lbs)
(in) (60 Duro) (in)
(in)
(in)
(in)
Our wooden floor specifications can be modified depending on your specific construction and fin15 to 150 0.23
9 Hz 33/16 15/8
11/2 11/4
ish. For example, rather than plywood you might be using heavy tongue and groove sub-flooring
50 to 300 0.28
8 Hz 37/8 25/16 11/2 13/4
across the sleepers and a hardwood finish.
140 to 600
0.40
1/8” VINYL ACOUSTICAL TILE
Test
1
3” STRUCTURAL SLAB
ON STEEL DECK
HUNG ACOUSTICAL CEILING
Test
2
}
Test
3
TYPICAL WOODEN FLOATING FLOOR
WOODEN FLOATING FLOORS FOR DANCE FLOORS, STAGE FLOORS,
BOWLING ALLEYS, GYMNASIUMS, LIGHT DUTY MACHINE SHOPS, ETC.
A. Scope
Isolate the wooden floating floor from the building structure by means
of double deflection LDS isolators and perimeter isolation.
Spec
B. Materials
1. Sleepers: Kiln dried 2x4’s minimum 12’(3.6m) long.
Details
2. Flooring: 2 layers 3/4”(20mm) AC plywood.
3. LDS Isolators: Minimum of 11/2”(40mm) high with an extended LDS
covered base plate and a tapped steel insert on top. Isolators shall be
selected for a maximum of 0.23” deflection and shall be molded to the
following AASHTO Table 1 Bridge bearing properties.
Table 1. AASHTO BRIDGE BEARING SPECIFICATIONS FOR POLYISOPRENE
ORIGINAL PHYSICAL
PROPERTIES
Tests: ASTM D-2240 & D-412
Duro- Tensile Elongat.
meter Strength at Break
Shore A (min)
(min)
40±5 2000 psi 500%
50±5 2250 psi 450%
60±5 2250 psi 400%
70±5 2250 psi 300%
TESTED FOR AGING
OVEN AGING(70hrs/158°F) OZONE
ASTM D-573
Hardness
(max)
+10%
+10%
+10%
+10%
Tensile
Strength
(max)
-25%
-25%
-25%
-25%
Elongat.
at Break
(max)
-25%
-25%
-25%
-25%
ASTM D-1149
25 pphm in air
by Vol. 20%
Strain 100°F
No Cracks
No Cracks
No Cracks
No Cracks
COMPRES- LONG
SION SET TERM
CREEP
ASTM
D-395
ISO8013
22hrs/158°F
Method B 168 hrs
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
25%(max) 5%(max)
NOTE: 40 Durometer is not included in AASHTO Specifications.
Numbers are Mason standard.
4. Perimeter Isolation Sponge: Neoprene sponge 1/2”(12mm) thick.
5. Fiberglass Insulation: Unfaced lightweight 11/2”(40mm) – 3# Density
Fiber-glass Insulation Batts
}
3/4” PLYWOOD
2 X 4 WOOD SLEEPER 16” on Center
MASON ND MOUNT 24” on Center
6.5 Hz 51/2
35/16
23/4 25/8
MFS
Spring
Floor
Mounts
1” Wood
Nail
SAME AS TEST 1
SAME AS TEST 2
EXCEPT WITH FIBERGLASS
IN VOID BENEATH PLYWOOD
Robt. A. Hansen Assoc.
Field Test 1081 Apr 76
DOUBLE LAYER
PLYWOOD PATTERN
C. Floor System Construction Procedure
1. Cement 1/2”(12mm) thick neoprene sponge to walls around entire floor
area. Neoprene strip should be full height of overall construction.
2. Counter bore holes on 24”(600mm) centers in underside of 2x4 sleepers
so that the depth allows for an unloaded clearance of 5/8”(16mm)
between the underside of the sleeper and the top of the isolator base
plate. Holes shall be large enough to provide a minimum clearance of
1/4”(6mm) all around the diameter of the isolators. Bolt the isolators to
the 2x4 with flat head machine screws in countersunk holes.
2a. When height is not critical, use the following alternate.
Invert the LDS isolator and nail securely to the underside of the 2x4
sleeper on the center line.
3. Place the sleepers all around the perimeter of the room up against the
neoprene sponge perimeter isolation.
4. Place the balance of the sleepers in parallel rows on 16”(405mm) centers across the room as shown on the drawings.
5. Lay 11/2”(40mm) – 3# Density Fiberglass Insulation between rows of sleepers.
6. Attach the first 3/4”(20mm) layer of plywood to the sleepers with 2”
(50mm) flat head screws on 16”(405mm) centers. Lay the rows of plywood down so the joints are staggered by 48”(1220mm) and the plywood is snug against the perimeter neoprene sponge.
7. Lay the second layer of 3/4”(20mm) plywood down with the joints offset
16”(405mm) in both directions in relation to the first layer. Attach the
second layer of plywood to the first by means of 11/2”(40mm) long flat
head wood screws on 16”(405mm) centers in both directions. Use
wood glue between layers.
8. Apply floor finish as shown on the drawings.
D. Submittals
1. Load and deflection curves of all isolators.
2. Certification of the elastomeric compound to the listed AASHTO specifications.
E. Manufacturer
The following products are approved for use: Double Deflection LDS
Mountings manufactured to AASHTO specifications.
Mountings shall be Mason Industries, Inc. Type ND-BBP.
We are represented throughout the United States and Canada as well as many other parts of the world. Please call New York or Los Angeles with
your application problems. We are here to help you in every way possible.
SEND FOR OUR COMPLETE CATALOG
MASON INDUSTRIES, INC.
350 Rabro Drive,Hauppauge, NY 11788 • 631/348-0282 • FAX 631/348-0279
2101 W. Crescent Ave., Suite D • Anaheim, CA 92801 • 714/535-2727 • FAX 714/535-5738
Email [email protected] or [email protected] • Website www.Mason-Ind.com
5/06
Tm605
Printed
in U.S.A.
