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R403.4 Footings for Precast Concrete Foundations

Residential Code 2015 of Utah > 4 Foundations > R403 Footings > R403.4 Footings for Precast Concrete Foundations

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Footings for precast concrete foundations shall comply with Section R403.4.

TABLE R403.4 MINIMUM DEPTH OF CRUSHED STONE FOOTINGS^a (D), (inches)

NUMBER OF STORIES	UNIFORM WALL LOAD	LOAD-BEARING VALUE OF SOIL (psf)
		1500				2000				3000				4000
		MH, CH, CL, ML				SC, GC, SM, GM, SP, SW				GP, GW
		Wall width (inches)				Wall width (inches)				Wall width (inches)				Wall width (inches)
		6	8	10	12	6	8	10	12	6	8	10	12	6	8	10	12
Conventional light-frame construction
1-story	1100 plf	6	4	4	4	6	4	4	4	6	4	4	4	6	4	4	4
2-story	1800 plf	8	6	4	4	6	4	4	4	6	4	4	4	6	4	4	4
3-story	2900 plf	16	14	12	10	10	8	6	6	6	4	4	4	6	4	4	4
4-inch brick veneer over light-frame or 8-inch hollow concrete masonry
1-story	1500 plf	6	4	4	4	6	4	4	4	6	4	4	4	6	4	4	4
2-story	2700 plf	14	12	10	8	10	8	6	4	6	4	4	4	6	4	4	4
3-story	4000 plf	22	22	20	18	16	14	12	10	10	8	6	4	6	4	4	4
8-inch solid or fully grouted masonry
1-story	2000 plf	10	8	6	4	6	4	4	4	6	4	4	4	6	4	4	4
2-story	3600 plf	20	18	16	16	14	12	10	8	8	6	4	4	6	4	4	4
3-story	5300 plf	32	30	28	26	22	22	20	18	14	12	10	8	10	8	6	4

For SI: 1 inch = 25.4 mm, 1 plf = 14.6 N/m, 1 pound per square foot = 47.9 N/m².

a. Linear interpolation of stone depth between wall widths is permitted within each Load-Bearing Value of Soil (psf).

FIGURE R403.4(1) BASEMENT OR CRAWL SPACE WITH PRECAST FOUNDATION WALL BEARING ON CRUSHED STONE

FIGURE R403.4(2) BASEMENT OR CRAWL SPACE WITH PRECAST FOUNDATION WALL ON SPREAD FOOTING

R403.4.1 Crushed Stone Footings

Clean crushed stone shall be free from organic, clayey or silty soils. Crushed stone shall be angular in nature and meet ASTM C 33, with the maximum size stone not to exceed ¹/₂ inch (12.7 mm) and the minimum stone size not to be smaller than ¹/₁₆ inch (1.6 mm). Crushed stone footings for precast foundations shall be installed in accordance with Figure R403.4(1) and Table R403.4. Crushed stone footings shall be consolidated using a vibratory plate in a maximum of 8-inch (203 mm) lifts. Crushed stone footings shall be limited to Seismic Design Categories A, B and C.

R403.4.2 Concrete Footings

Concrete footings shall be installed in accordance with Section R403.1 and Figure R403.4(2).

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