Building foundations should rest on _______.
A. Shallow soils in temperate climates (less than 2 feet deep)
Answer: C. Sand
Peat and topsoil are organic, so they are unstable. In temperate and cold climates, foundations should rest below the frost line, typically more than two feet deep. Sand may not seem stable, but it is! If you’ve been to the beach, you’ve almost certainly seen hundreds of buildings supported by sandy soil. This house is on friction piles (telephone poles driven into the ground); this one is likely on a spread footer concrete foundation.
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