Revisions log for Answer #2743
This is the answer to the question What vapor barrier option to choose for the roof?
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2022‑10‑10 19:41
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Drywall also needs to be treated. It's not as labor intensive, but it is. And the foil is relatively error-resistant.
Then the OSB boards must be tongue and groove glued accordingly, and the joint with the wall must be secured with permanently elastic strips.
Both options have their advantages and disadvantages. I would choose OSB.