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Basement Vapor Barriers

Posted by Mike Meehan on July 27th, 1998 01:29 AM
In reply to My opinion by Steve on February 1st, 1998 11:40 AM [Go to top of thread]

Another idea - the vapor barrier also needs to be placed on the *warm* side of the insulation. Otherwise, water vapor migrating from occupied spaces into the wall cavity may reach the dew point in the midst of the insulation. A problem if you are using fiberglass!

I also understand the concern about moisture originating from the block wall. A compromise: Place the vapor barrier on the warm side - just below the drywall. Then use foam board insulation against the block wall.

If moisture gets into the wall assembly, it won't hurt the rigid insulation. ideally, there should be a vapor barrier (and insulation!) on the exterior of the basement wall.

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