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Old 01-03-2010, 10:46 PM   #16
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Two vapor barriers is a no-no.

My house has the same black coating on the outside of the concrete foundation. I assumed (for better or worse) that the coating was a vapor barrier and I put up a typical stud and fiberglass insulation and drywall wall against the foundation with no additional vapor barrier.

The inspector saw the lack of a vapor barrier on the inside and gave it a passing grade.

I just hope that any moisture that got through the drywall and insulation and condensed against or inside the concrete in winter will evaporate in the summer.


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Old 01-04-2010, 09:26 AM   #17
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But AllanJ, the inspector could have seen the black coating outside, noted that it was a waterproofing membrane, and then saw your drywall on the inside and noted that that was a vapour retarder, so he passed it, no?

What do you assume now about your black stuff?


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