Proper Vapor Barrier to Use for a Crawl Space

clagaMay 30, 2012


I'd like to add either a laminate or resilent fiber-glass vinyl floor on an enclosed porch in Maine. The flooring on the porch now is 5/4" pressure treated decking built over a concrete wall and floor crawl space. I was wondering what type of vapor barrier is need or necessary to add before I put down a 1/4" luan subfloor before I install the finished product. Should I put the vapor barrier over the pressure treated floor or on the bottom side of the floor joist.


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A vapour barrier under the subfloor or laminate will trap moisture. A vapour barrier under the floor will not stop condensation on the ceiling of the crawlspace and movement of the moisture into the floor above.

Converting the crawlspace into a conditioned space will avoid moisture problems.

Here is a link that might be useful: Conditioned Crawlspace Construction

    Bookmark   May 30, 2012 at 6:38PM
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