Thorsten Chlupp is inside of a much more difficult climate and he appears to be accomplishing wonderful with straightforward loose fill within the attic floor....obviously he is employing "enough" amounts (cellulose galore)and he has baffles close to the soffit.
Okay, I had been figuring that the total of your rigid foam + cellulose needed to be a particular R-worth in combination and had been thinking about applying fewer rigid foam. I've been reading through about diverse styles of cellulose. Considering that I'm installing from previously mentioned would anything like stabilized cellulose do the job as it has a little bit water added?
The danger is that inside moisture will migrate into the cold sheathing, bringing about condensation or dampness accumulation.
A. As I wrote during the posting, "Most rafters aren’t deep enough to support the insulation necessary to meet minimal R-values demanded by code, especially if the rafter bays include a air flow channel. ...
I now realize that stucco can't be placed on a roof, so I will revert to your a metal roof, but still want to acquire an unvented attic. I have study by "Making a conditioned attic", and am even now undecided concerning The simplest way to commence.
Set up a layer of shut-cell spray foam versus the underside of the roof sheathing, and fill the rest of the rafter cavity by having an air-permeable insulation. Once again, this type of assembly is meant to dry to the inside, And so the assembly really should hardly ever contain an inside polyethylene vapor barrier.
one. Eliminate the can lights and throw them away. Recessed can lights need to never ever be set up within an insulated cathedral ceiling.
Thanks all over again to the responses. Now I just have to have to seek out an installer in this region who is aware what they're performing (to date it has been iffy)!
 To all of my family, buddies, and neighbors thank you for the help and issue with each of the amazing foods, cards and sort terms.
Many thanks for your response Martin. Would you continue to be joyful to implement that unvented technique for any renovation problem exactly where There is certainly non-breathable membrane (eg bitumous 'felt') earlier mentioned stable board sheathing?
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You're appropriate that such a roof assembly will not dry to the interior. But it isn't supposed to. I'd tape the polyiso -- the tape would not induce any problems.
A whole new standalone direct vent gas stove is going in with the considerably end of your area beneath the metal box. I determine if we use XPS board, it would need to be pulled back again numerous inches from close to that place, but I did not Feel it would reduce me from applying XPS fully. Looks like Roxul is significantly less of an issue when it comes to warmth/fire.
The strategy: Part A: I discovered one" Dow rigid foam backed see page 5/8CDX for a similar price tag because the bare CDX, and I decide to double it up similar to a SIP, setting up The underside sheet foam facet up and another sheet on leading (staggered of course) Along with the foam facing down, supplying me 2" of insulation concerning the plywood.