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Old 05-24-2014, 07:00 AM   #16
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drywall on ceiling of bathroom


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Originally Posted by Perry525 View Post
Drywall is transparent to water vapor, that is to say water vapor passes through it without problem. Drywall is always full of water and as such provides a 30 minute fire wall. If you don't want water vapor to pass through, paint with either gloss or laytex.
You do not want water vapor in your attic.......so paint.
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Old 05-25-2014, 10:41 AM   #17
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drywall on ceiling of bathroom


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HUH
http://www.energyvanguard.com/blog-b...rrier-Probably

"The permeance of unpainted drywall is very high, generally between 20 and 90, so it's not a vapor retarder at all."
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Old 05-25-2014, 11:01 AM   #18
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drywall on ceiling of bathroom


I use an oil base prime and good cover semi-gloss latex..... I've got an almost entirely closed in master shower.... two showers a day... for almost twenty years with no issue problem.

(Don't even remember if it's green board or just standard... sealed, either is fine in my opinion.)

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