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Foundations Frost Protection

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3/5/2015

Chapter 4 - Foundati ons

International Residential Code for One- and Two-Family Dwellings [ 2012 (Second Printing) ] Chapter 4 - Foundations SECTION R401 GENERAL SECTION R402 MATERIALS SECTION R403 FOOTINGS SECTION R404 FOUNDATION AND RETAINING WALLS SECTION R405 FOUNDATION DRAINAGE SECTION SECT ION R406 FOUNDATION WATERPROOFING AND DAMPPROOFING SECTION R407 COLUMNS SECTION R408 UNDER-FLOOR SPACE

R403.1 General. R403.2 Footings for wood foundations. R403.3 Fr ost-protected ost-protected shallow foundations. R403.4 Footings for precast concrete foundations. R403.1 General. R403.2 Footings for wood foundations. R403.3 Frost-protected shallow foundations. R403.4 Footings for precast concrete fo un unda dations. tions. Top Pr evious evious Section Next Section  Next Section To view view the next subsection subsection please select the Next Section Section option. R403.3 R403.3 Frost-protected shallow  shallow  foundations. For buildings For buildings where w here the monthly mean temperature of the building is maintained at a minimum of 64°F (18°C), footings are not required required to extend below the frost line lin e when protected from frost by insulation in accordance with Figure R403.3(1) and Table R403.3(1). R403.3(1). Foundations protected protected from frost in accordance with Figure R403.3(1) and Table R403.3(1) shall not be used for  unheated unheated spaces space s such as porches, utility rooms, garages and carports, and shall not be attached to basements or crawl spaces that are not maintained at a minimum monthly mean temperature of 64°F (18°C).

Materials used below belo w grade for the purpose of insulating footings against f rost rost shall be labeled as complying with ASTM C 578. TABLE R403.3(1) MINIMUM FOOTING FOOTING DEPTH AND INSULATION REQUIREMENTS FOR FROST-PROTECTED FOOTINGS IN HEATED HEATED BUILDINGS BUILDINGSa

AIR  MINIMUM VERTICAL FREEZING FOOTING INSULATION INDEX DEPTH, D R-VALUEc, d (inches) (°F-days)b

HORIZONTAL HORIZONTAL INSULATION R-VALUEc, e Along At walls corners

HORIZONTAL INSULATION DIMENSIONS PER FIGURE R403.3(1) (inches) A

B

C

1,500 or less

12

4.5

Not  Not  Not  Not  Not required required required required required

2,000

14

5 .6

Not  Not  Not  Not  Not required required required required required

2,500

16

6.7

1.7

4.9

12

24

40

3,000

16

7.8

6.5

8.6

12

24

40

3,500

16

9.0

8.0

11 11.2

24

30

60

4,000

16

10.1

10.5

13.1

24

36

60

For SI: 1 inch = 25.4 mm, °C = [(°F) - 32]/1.8. a. Insulation requirements are for protection against frost damage in heated buildings. Greater values may be required to meet energy conservation standards.  b. See Figure R403.3(2) or Table R403.3(2) for Air Freezing Index values. http://publ i cecodes.cyber r egs.com/i cod/i r c/2012/i cod_i r c_2012_4_par 033.htm

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3/5/2015

Chapter 4 - Foundations

c. Insulation materials shall provide the stated minimum  R-values under long-term exposure to moist, below-ground conditions in freezing climates. The following  R-values shall be used to determine insulation thicknesses required for this application: Type II expanded polystyrene-2.4 R per inch; Type IV extruded polystyrene-4.5 R per inch; Type VI extruded polystyrene-4.5 R per  inch; Type IX expanded polystyrene-3.2 R per inch; Type X extruded polystyrene-4.5 R per inch. d. Vertical insulation shall be expanded polystyrene insulation or extruded polystyrene insulation. e. Horizontal insulation shall be extruded polystyrene insulation.

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3/5/2015

Chapter 4 - Foundations

For SI: 1 inch = 25.4 mm. a. See Table R403.3(1) for required dimensions and R-values for vertical and horizontal insulation and minimum footing depth.

FIGURE R403.3(1) INSULATION PLACEMENT FOR FROST PROTECTED FOOTINGS IN HEATED BUILDINGS TABLE R403.3(2) AIR-FREEZING INDEX FOR U.S. LOCATIONS BY COUNTY AIR-FREEZING INDEX STATE

1500 or less

2000

2500

3000

3500

4000

Alabama

All counties











Alaska

Ketchikan Gateway, Prince of  WalesOuter  Ketchikan (CA), Sitka, WrangellPetersburg (CA)

 — 

Aleutians West (CA), Haines, Juneau, SkagwayHoonahAngoon (CA), Yakutat

 —

— 

All counties not listed

Arizona

All counties











 

Arkansas

All counties











 

California

All counties not listed

 Nevada, Sierra







— 

All counties not listed

Archuleta, Custer, Fremont, Huerfano, Las Animas, Ouray, Pitkin, San Miguel

Clear Creek, Conejos, Costilla, Dolores, Eagle, La Plata, Park, Routt, San Juan, Summit

Hartford, Litchfield



Colorado

All Connecticut counties not listed

 

Alamosa, Grand, Jackson, Chaffee, Larimer, Gunnison, Hinsdale, Moffat, Lake, Mineral Rio Saguache Blanco, Rio Grande —





 

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Hawaii

Chapter 4 - Foundations







— 

Bingham, Bonneville, Camas, Caribou, Elmore, Franklin, Jefferson, Madison, Teton

Bear  Lake, Butte, Custer, Fremont, Lemhi

Clark

— 

Illinois

Boone, Bureau, Cook, Dekalb, DuPage, Fulton, Grundy, Henderson, Henry, Iroquois, Jo Daviess, Kane, Kankakee, Kendall, Knox, All La Salle, Lake, Carroll, Ogle, counties Lee, Livingston, Stephenson, not listed Marshall, Mason, Winnebago McHenry, McLean, Mercer, Peoria, Putnam, Rock  Island, Stark, Tazewell, Warren, Whiteside, Will, Woodford

 —



— 

Indiana

Allen, Benton, Cass, Fountain, Fulton, Howard, Jasper, Kosciusko, La All Porte, Lake, counties Marshall, Miami, not listed  Newton, Porter, Pulaski, Starke, Steuben, Tippecanoe, Tipton, Wabash, Warren, White





— 

Idaho

All counties

 —

Adams, Bannock, Blaine, All Clearwater, counties Idaho, not listed Lincoln, Oneida, Power, Valley, Washington

 —

(continued) TABLE R403.3(2)—continued AIR-FREEZING INDEX FOR U.S. LOCATIONS BY COUNTY

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Iowa

Chapter 4 - Foundations

Butler, Calhoun, Cerro Gordo, Cherokee, Chickasaw, Clay, Clayton, Delaware, Dubuque, Dickinson, Fayette, Emmet, Floyd, Appanoose, Howard, Franklin, Davis, All Kossuth, Grundy, Fremont, counties Lyon, Hamilton, Lee, not listed Mitchell, Hancock, Van Buren O’Brien, Hardin, Osceola, Humboldt, Winneshiek  Ida, Jackson, Jasper, Jones, Linn, Marshall, Palo Alto, Plymouth, Pocahontas, Poweshiek, Sac, Sioux, Story, Tama, Webster, Winnebago, Woodbury, Worth, Wright

 —

— 

Kansas

All counties











 

Kentucky

All counties











 

Louisiana

All counties











 

Aroostook, Franklin, Oxford, Penobscot, Piscataquis, Somerset

 —

— 









 —





— 

Maine

Maryland

York  

All counties

All Massachusetts counties not listed

Androscoggin, Cumberland, Knox, Hancock, Lincoln, Kennebec, Sagadahoc Waldo, Washington — Berkshire, Franklin, Hampden,

 

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3/5/2015

Chapter 4 - Foundations

FIGURE R403.3(4) INSULATION PLACEMENT FOR FROST-PROTECTED FOOTINGS ADJACENT TO HEATED STRUCTURE Top Previous Section Next Section To view the next subsection please select the Next Section option. COPYRIGHT 2007 by INTERNATIONAL CODE COUNCIL

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