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What is the most typical thickness of a slab-on-grade concrete foundation?

3-4 inches
12%
4-5 inches
48%
5-6 inches
12%
6-8 inches
16%
8-10 inches
12%
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Question: What is the most typical thickness of a slab-on-grade concrete foundation?
Top Answer (48% of 25 votes): 4-5 inches.

Answer: 4-5 inches
Explanation: Foundation slabs are 4"to 6" thick except the footers which bear weight of structure and are at least 12"X18".
Allied Concrete LLC
Answer: 4-5 inches
Explanation: Slab-on-grade concrete foundations should have a minimum of 3~1/2" slab, a minimum footer depth of 18", and a minimum footer width of 12".
Cronin Construction & Resource Management, LLC
Answer: 8-10 inches
Explanation: A "Slab-on-grade concrete foundation" is an atypical term. Typically, the foundation is thought of as being comprised of elements of Spread, Strip, Turndown, and Deep Bearing footings, with the slab representing the floor of the building. Although it is not abnormal to build the floor and footings in a single monolithic piece, the footings are generally considered to function as the foundation, while the slab functions as the floor. Monolithic slabs vary in thickness from 4" in non-load bearing portions of the floor, to 24" in load bearing portions.
Maven Group LLC
ProMatcher
Answer: 4-5 inches
Explanation: 4 to 5 inches usually is standard unless it is a heated floor or load bearing walls will sit on it.
Concrete services
Answer: 4-5 inches
Explanation: we do not pour slab on grade foundations in frost prone area
LPG,LLC
Answer: 8-10 inches
Explanation: Normally the footing will be approx 1 ft deep depending on where your building. That's why its called a footing.
h and h company
ProMatcher
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