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secutanudu 05-07-2010 11:06 AM

What type of insulation?
I am re-insulating the ceiling in my second floor bathroom. There is no attic above the bathroom, this is a finished attic. I will put proper vents on the underside of the roof (new flat roof). Should I used faced or unfaced insulation in this scenario? The old insulation was faced and stuffed right on the underside of the roof, and there was a lot of moisture and some mold up there. Luckily, I caught it before the wood rotted out.

I will be installing a good exhaust fan as well. Thanks.

RoyalAcresRod 05-07-2010 01:44 PM

If there's conditioned space right above the bathroom, why are you insulating the ceiling? Or is this a case where part of the ceiling is over area outside the conditioned area, such as behind a kneewall in the attic?

Or, is the bathroom in the finished attic?

secutanudu 05-07-2010 01:56 PM

It's a finished attic. I am thinking unfaced insulation with plastic on the warm side of the insulation.

RoyalAcresRod 05-07-2010 02:43 PM

I think that is an excellent way to go in a warm and humid room on an exterior plane. Be sure to tape all joints in the vapor barrier with a good "tuck tape"


secutanudu 05-07-2010 07:40 PM

I can't seem to find Tuck tape. Is foil tape use for ducts sufficient? I will also have a good panasonic exhaust fan and moisture-resistant drywall.

RoyalAcresRod 05-07-2010 09:45 PM

"tuck" tape is a generic term. Someone may correct me, but I believe Tvyek tape works well is this application. It's usaully about $12 a roll at he Big Box stores

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