Page 191 - Masonry and Concrete

Footings, Foundation Walls, Basements, and Slabs
190 CHAPTER SIX

Class of Material Soil-Bearing Pressure, psf

Crystalline bedrock 12,000
Sedimentary rock 6,000
Sandy gravel or gravel 5,000
Sand, silty sand, clayey sand, 3,000
silty gravel, and clayey gravel
Clay, sandy clay, silty clay, and 2,000
clayey silt

FIGURE 6-2
Allowable bearing pressures for various types of soil. (from Council of American Build-
ing Officials, One and Two-Family Dwelling Code, Falls Church, VA).

FROST DEPTH IS
INDICATED IN INCHES

FIGURE 6-3
Average annual frost depth for continental United States. (from Architectural Graphic Standards, 9th ed.).

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