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Concrete is composed of cement, aggregate (including crushed rock and sand) and water. In homes, it's frequently seen in the foundation, driveway, sidewalk, patio, and stone walls. Note that bricks use mortar in the joints, not concrete.

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I plan on making a garage out of a large carport, and I've watched and I understood how to properly insulate a new concrete slab. 4 inches of gravel, vapor barrier, 2 inch foam board, 2 inches of … sand and then 4-6 inches of poured concrete with mesh rebar in it. My question is, how in the world will 2 inch foam board support all the concrete? Especially when I park both my trucks on top of it! Won't it crush in some parts and be uneven underground. Why does it make a good base? …
asked May 30 by Jeffyx