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QUESTION 48-What is the term for the bottom layer of a floor that sits on the joists and provides support for the layers above it?
Correct Incorrect Subfloor: The subfloor is like the sturdy foundation of a floor. It's the solid layer that sits on top of the joists and provides support for everything else above it. Usually made of plywood or OSB, it forms a strong and flat surface. In the case of a concrete floor, the concrete slab itself acts as the subfloor.