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Old 11-28-2014, 03:06 PM   #1
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Vapor barrier and rigid foam


I am planning to install a new drywall ceiling over strapping over an old, badly cracked plaster ceiling, in part because tearing down the plaster and lathe would release eight inches of vermiculite into the room below.

I was thinking I would use us some leftover 3/4 pink (unfaced) rigid insulation by putting it right against the plaster before nailing in the strapping.

Is it worth adding a layer of 4 or 6 mil plastic to the bottom of that pink board before adding the strapping as a vapor barrier, or does the pink board have enough vapor retarding potential on its own? We live in a cold climate.

I don't mind adding the plastic, but if it is redundant I won't bother.

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Old 11-28-2014, 03:47 PM   #2
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Vapor barrier and rigid foam


Wheres the home?

If the ceiling is airtight, additional vapor retarder level beyond the foam is likely unnecessary.

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Old 11-28-2014, 03:57 PM   #3
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Vapor barrier and rigid foam


Thanks very much.

The house is in Vermont. Some significant cracking present. You can't see lathe, but you could pretty easily after a few gentle taps with the hammer.
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Old 11-28-2014, 05:27 PM   #4
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Vapor barrier and rigid foam


I would still get that vermiculite out of there if it was me. I used to be an abatement contractor so it isn't that difficult if you use common sense protocols but putting up the rigid foam and then drywall should make it plenty airtight.
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