29 Dec '11, 4pm

Green Building Q&A: Wood Floor, Concrete slab, and Moisture

Hi all, I had a question about proper installation of a wood floor on a concrete slab. Assuming the slab has been moisture tested (and passes with flying colors), would it be alright to just put a plywood subfloor and finished wood floor on top? Or would I still be at risk of a mold issue in the future? Reading about this online has pointed me in a thousand different directions. Some places say just to put tar paper under the subfloor, some places say I need a vapor barrier, some places say I need to float the wood floor, and some places say I need TWO layers of plywood subfloor in different directions. I'm really confused. Then there's the issue of nailing through the vapor barrier. Am I correct in assuming that by nailing through it into the concrete, I am creating a weak point in the barrier for moisture to come up? Honestly, I thought installing wood floors would be ea...

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