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What is Subfloor?

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Definition: Subfloor refers to the bottom-most structural floor underneath the decorative or "finish" floor.

Finish flooring, such as ceramic tile, solid wood, laminate, engineered wood, and others, all employ subfloor in their construction; after all, they need to rest on something.

In some cases, subfloor is the only layer between the decorative flooring and the joists.

Typically, though, an underlayment--plywood or cement board--rests between the subfloor and the finish floor.

Examples:
The floor installers were forced to put down a layer of quarter-inch plywood underlayment on the subfloor before putting down the Pergo.

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