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Wood Subfloor over concrete not penetrating the vapor retarder
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03-25-2013, 08:46 AM #3
jim decker Concrete Moisture Enthusiast *
Status: Offline Posts:40 Threads:3 Joined:Nov 2011
Typically I feel the same as you regarding the amount of vapor penetration but say you were going over lightweight concrete NWFA does not feel nailing into it will hold so for solid nail down a floating floor is the way to go.
Funny all I ever hear about is plastic yet we still use 2 layers of 15 lb asphalt felt adhered with black mastic in addition to plastic. One doesn't have to figure out the permeability of asphalt.

We typically use powder gun fastening all the time BUT then we are not on the gulf coasts states. El Paso on the moisture map is rated 5 mc in wood winter and 9 mc in wood in summer. Florida is 11 and 13 different areas must be adjusted accordingly. JD notice I am getting better differentiating between mc for wood and rh for concrete. You keep me on my toes.








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