I want to drywall over my existing plaster. I have blown-in insulation but no vapor barrier on the interior. Can I add a polyethylene vapor barrier or vapor barrier paint before I drywall. Will this cause any moisture problems with the plaster?
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Yes. No.
Will the plaster dry out from any normal moisute conditions if it is put on the cold side of the barrier? Or will it create mold problems? If I don't will I create mold problems on the drywall?
Does painting plaster cause moisture problems? Paint (especially the old oil paints) is a vapor barrier.
Blast,
You asked, "Will the plaster dry out from any normal moisture conditions if it is put on the cold side of the barrier?"
I'm confused. You're putting plaster on the COLD side of a polyethylene vapor barrier? Where are you, Florida?
If you are in a hot climate with many months of air conditioning, you definitely don't want to install interior polyethylene.
Martin Holladay, senior editor
http://www.greenbuildingadvisor.com