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maverick1096 07-24-2010 04:01 PM

insulating attic walls
I could use some help please. I insulated my attic walls with faced insulation. I was told it was ok to cover the insulation with plastic. I live in North Carolina and worry about moisture under the plastic and onto the insulation. what I am asking is, is it ok to cover the insulation either faced or unfaced with plastic in the hot attic??? I hope someone could give me an accuate answer...Thank you

Ron6519 07-24-2010 04:10 PM

If you installed plastic over a faced insulation you would have 2 vapor barriers. You should never have 2 vapor barriers.

maverick1096 07-24-2010 04:26 PM

Ron thank you for the reply...Is it ok to cover unfaced insulation with plastic...?

Wildie 07-25-2010 08:14 AM

The vapor barrier should be on the 'conditioned' side of the insulation. Conditioned means on the side that faces the living space.

Scuba_Dave 07-25-2010 09:45 AM


Originally Posted by maverick1096 (Post 474668)
Ron thank you for the reply...Is it ok to cover unfaced insulation with plastic...?

Yes - OK to cover unfaced w/plastic

Gary in WA 07-25-2010 01:38 PM

No, do not use plastic yet. We need to know if the wall is an interior with a roof behind or an exterior wall with siding. The siding, sheathing, and wall thickness all pertain.

2nd title here:

B.S.I. says:

Vapor retarder or vapor barrier:

Ask your local B.D. for their ruling. If this area will not be heated and stay an attic, no plastic. If an inside wall with an attic behind it, no plastic but install some house wrap to prevent wind-washing of the wall insulation on the attic side. If the location was South, the vapor barrier would go on the unconditioned side (outside) to keep the humid air out of the wall cavity.

Be safe, Gary

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