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Section R403.1.1, Minimum Size, of the IRC, is hereby amended by adding the following Table R403.1(4):
For purposes of sizing and construction of footings for residential conventionally light-framed construction with cast-in-place or fully grouted masonry foundation wall construction, constructed upon undisturbed, non-expansive soils, the following table and footnotes may be used in lieu of table R403.1(1), R403.1(2), R403.1(3):
Table R403.1(4)
Number Stories | Foundation Wall Thickness | Minimum Footing Thickness (inches) | Minimum Footing Width (inches) | Minimum Continuous Reinforcement (rebar) | |
Concrete | Masonry
| ||||
1 | 8 | 8 | 8 | 16 | 2 - #4 |
2 | 8 | 8 | 8 | 16 | 2 - #4 |
Demising Walls | 8 | 8 | 8 | 18 | 2 - #4 |
3 | 10 | 10 | 12 | 22 | 3 - #4 |
Demising Walls | 10 | 10 | 12 | 22 | 3- #4 |
a. assumed soil bearing capacity 2000 psf
b. foundations placed upon areas of poor bearing or expansive soils shall be engineered
c. footings carrying point loads shall be engineered
d. foundations may support a roof in addition to the stipulated number of floors
e. foundations supporting a roof only shall be as required for supporting one floor
f. reinforcing shall be evenly spaced with proper overlaps
g. perimeter footings shall be minimum 42” below surrounding grade within 5’ horizontally of foundation
Section R403.1.4.1, Frost Protection, of the IRC, is hereby amended by deleting all existing exceptions and inserting in lieu thereof the following exception:
Section R403.1.4.1 Frost protection exception Detached garages of light frame wood construction of 1,010 square feet or less in size and detached garages of 400 square feet or less in size of other than light frame wood construction and not located entirely within the buildable area of the lot may be provided with a floating slab. The floating slab shall include a thickened slab edge of a minimum twelve (12) inches thick. Six inches of the thickened slab shall be below grade and six inches shall be above finished grade. The bottom portion of the thickened slab area shall be twelve (12) by twelve (12) inches. Two #4 rebar shall be placed within the thickened edge continuous around the perimeter of the slab. Floors shall be of Portland cement concrete not less than 4 inches thick. Garages areas shall have all sod and/or debris removed prior to installation of said floor.
Section R404.1, Concrete and masonry foundation walls, of the IRC, is hereby amended by adding the following paragraph:
Section R404.1 Concrete and masonry foundation walls lateral support Prior to backfill in lieu of a poured in place floor slab to provide bottom lateral support, one of the following may be provided - (1) a full depth (minimum 1-1/2") nominal 2" x 4" keyway may be formed into the footings to secure the bottom of the foundation wall -or- (2) 36" long vertical # 4 rebar may be embedded a minimum of 6" into the footings not to exceed 7' o.c. spacing
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