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minndonn

Insulating peaked ceiling

4 posts in this topic

I need to re-insulate my ceiling which is a peaked with a space of about 7 inches (2X8) that was initially filled with blown in cellulite insulation. I am thinking about blowing in foam insulation. Iam considering icynene or polyurethane foam. Anyone have recommendations or preferences. Also interested in alternatives.

Thanks

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Rigid foam would be my choice with that little of space. The best may be to hire someone to blow in foam like you said though. Would probably give the best R value. Make sure it is vented properly.

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Spray Foam would work good there, but there is closed cell and open cell insulation. Make sure the type you use does not make a double vapor barrier (traps moisture), and some of the foams are considered a VB.

Spray foams will give roughly an extra 1/3 R value for the space available, and seals any cracks or small air gaps. MAkes it very benefitial in these areas, as long as a contractor can get to them without problems.

As roofer said, make sure you have venting at the wall locations, with wind breaks, and chutes for air flow from vented soffits to attic space. Depending on the age of the house, you may not have chutes or wind breaks, but both are required by energy code now.

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You can't blow insulation in without filling the whole cavity unless there was some type of dam to keep that air space. Which I doubt there is and probably no vapor barrier as well. Whatever you do there isn't going to be right. We need more details about the house. The age will give us a good idea of what you have.

So I ask, is it now exposed with sheet rock and insulation gone?

If so I'd go with closed cell spray foam in this situation. As Farmboy1 said, because of the higher R value per inch. You'll need to keep that air space between the insulation and roof deck.

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