Red Oak Hardwood floor on plywood above crawl space in hot humid climate
I am about to install red oak hardwood floor in my living room. The local installed wants to put 30 pound felt paper on the plywood subfloor to control moisture levels in the hardwood floor over time. In theory this makes sense however underneath the subfloor I have a crawl space that is encapsulated and humidity controlled. I also am planing to install a liquid applied air barrier (Pro Clima Viscon) on the underside of the subfloor to completely separate the crawl space from the living space. Viscon has a perm rating of 1.
My concern is that I then have two vapor retarders (Viscon on the underside and felt paper on the top side of the subfloor) and that it could cause moisture issues in the subfloor.
Vapor barriers are pretty complex to get right and you can easily get it wrong. So my questions is – can anybody comment if I am introducing too much risk with the viscon on the underside or should I look into not using the felt paper between subfloor and hardwood floor.
thank you so much!
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