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Wood Subfloor over concrete not penetrating the vapor retarder
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03-25-2013, 10:41 AM #4
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,067 Threads:69 Joined:Dec 2009
Some of the older flooring guys have showed me some amazing uses for asphalt impregnated felt.. I bet it would work just fine as you said.

I saw an old tile installer use it as a slip sheet over a crack in the slab. He put his ceramic right over the top. I was upset as all get-out because it was my job (I was the QC rep for the builder) but he assured me this would work. I of course wanted to use the latest and greatest crack membrane on the market.

I checked that restroom for 5 years and never saw any hairline crack at all. Now was it because of the felt or because the slab never moved?

I can confidently say I know next to nothing in the grand scheme of things.... Tongue

JD Grafton
Concrete Answers for Flooring Problems

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