Page 190 - Masonry and Concrete

Footings, Foundation Walls, Basements, and Slabs

Minimum Specified Compressive Strength

Weathering Potential*
Type or location
of concrete Negligible Moderate Severe
Basement walls and
foundations not exposed
to weather 2,500 2,500 2,500‡
Basement slabs and
interior slabs on grade,
except garage floor slabs 2,500 2,500 2,500‡
Basement walls,
foundation walls,
exterior walls and other
vertical concrete work
exposed to weather 2,500 3,000† 3,000†
Porches, carport slabs
and steps exposed to
weather, and garage slabs 2,500 3,000†§ 3,500†§

*See map for weathering potential (Alaska and Hawaii are classified as
severe and negligible, respectively).
†Use air-entrained cement.
‡Use air-entrained cement if concrete will be subject to freezing and
thawing during construction.
1
§Minimum cement content 5- ⁄2 bags per cubic yard.

SEVERE

MODERATE
NEGLIGIBLE
FIGURE 6-1
Minimum required strength of concrete for footings, slabs, and foundations. (from Coun-
cil of American Building Officials One and Two-Family Dwelling Code, Falls Church, VA).
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