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Old 03-02-2012, 11:27 PM  
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Default Foil backed drywall and vapor barrier

I'm working on my kitchen and I removed some drywall. My drywall is foil backed and I'm not able to find any locally. How do I seal a poly vapor barrier to the existing drywall. Removing the entire wall of drywall is not really an option.

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Old 03-03-2012, 07:34 PM  
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You may/not need a true Class 1 vapor barrier. Years ago (when your foil faced drywall was installed) we thought everyone needed a vapor barrier. Now, depends on the siding drainage, exterior insulating board, and location. Check the map and read if vapor retarder or barrier is required:
If needed, just put it on the wall under the new drywall sections as a vapor barrier is "area weighed" unlike an air barrier:

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