Basement insulation


Old 08-24-05, 01:25 PM
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Basement insulation

I have polysterene on a basement wall that is entirely above grade in that part of the basement. Because of the waste stack and other plumbing pipes along this wall, a 2x4 wall was framed 6-8 inches in and then 3 1/2 in. kraft-faced insulation (stapled inside the studs) put in the 2x4 wall. Question: Does this create a double vapor barrier? Would I be better off cutting the kraft-face paper before hanging the the drywall or should I just leave it as is?

Thanks in advance for your help! I would like to start the drywall but I will wait until I get some advise.
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Old 08-25-05, 06:40 PM
Join Date: Nov 2001
Location: USA
Posts: 1,873
The polysterene on the concrete has a very high Perm Rating. It does not qualify as a vapor barrier. So would not cut off the Kraft paper.
Old 08-26-05, 05:28 AM
Join Date: Jul 2005
Location: Ottawa, Canada
Posts: 857
Kraft paper is not considered an ideal vapour barrier on it's own as there are seams at each stud. You should either seal those seams with VB tape or install 6 mil poly over top. An effective VB is one that is sealed properly.

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