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Old 05-31-2013, 07:01 PM   #1
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basement insulation deliemma. Help!


Okay. I just flipped a home and insulated the basement wall using existing framing. It was 1x2 attached to the wall and I bought new fiberglass insulation with paper backing to fit In between the studs and then put on vapor barrier. I sold the houses and had a leak at an egress window. They checked out the window and at the same time went through the basement and discovered the insulation was done wrong. They told me insulation was done wrong and that i should have used styrofoam (the pink stuff with smooth surfaces), put that on the concrete and then framed over that. They told me the paperbacking and vapor barrier will trap moisture.

My question is... is it necessary to do that? I do understand the latter is more effective, but can i get by with code requirements with the paper backing fiberglass insulation and vapor barrier. If not, i have to rip all the walls up! I don't want to do that!

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Old 05-31-2013, 09:07 PM   #2
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basement insulation deliemma. Help!


If the concrete foundation has a waterproof coating on the outside then the insulation inside should not have a vapor barrier. Fiberglass batts with the barrier can be used with numerous strips or squares (or circles) cut out of the barrier taking out at least 25% of the surface area. (The arrangement of the holes has to be such that the remaining paper barrier stapled to the studs will still hold the batt in place without sagging.

But all the experts say that if batts are used, there needs to be a gap of at least an inch between the batt and the concrete wall to prevent moisture stagnation and mold. If you use styrofoam boards, no such gap is needed.

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Old 06-01-2013, 08:55 AM   #3
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basement insulation deliemma. Help!


Where is the home located?

+1 to Allan.

You put fiberglass against concrete and put a double vapor retarder layer over it (kraft paper and vapor barrier), you are going to have mold and mildew if you are in a cold climate.
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Old 06-01-2013, 01:17 PM   #4
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basement insulation deliemma. Help!


Quote:
Originally Posted by Windows on Wash
Where is the home located?

+1 to Allan.

You put fiberglass against concrete and put a double vapor retarder layer over it (kraft paper and vapor barrier), you are going to have mold and mildew if you are in a cold climate.
The house is in vadnais heights, Mn
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