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There are also plywood subfloor systems with a plastic underlayment layer on the panels. I've layed such a subfloor on concrete - it was from a company called dri-core and it turned out very nice, dry, comfortable and warm, once carpet was installed on top. the plastic layer insulates and blocks moisture. the subfloor panels just interlock with T&G joints. The drawback of course is the high cost of the subfloor material and the shipping.
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