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Wood Subfloor over concrete not penetrating the vapor retarder
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03-25-2013, 06:38 AM #2
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
Thanks for that Jim. I can't remember asking how to install a floating wood underlayment but it is an interesting read.

I would suspect a system where you would lay down a vapor retarder, say at minimum a 10mil poly, then put down 3/4" plywood and shot it right through the poly to the concrete would work. I would hypothesize a hole every 12" or so would have a negligible effect on vapor transmission through the wood.

Any idea how we could test this type of install to prove the theory?

JD Grafton
Concrete Answers for Flooring Problems

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