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Basement insulation

Dave24's Avatar
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08-24-05, 01:25 PM   #1  
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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resercon's Avatar

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08-25-05, 06:40 PM   #2  
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.

em69's Avatar

Join Date: Jul 2005
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08-26-05, 05:28 AM   #3  
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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