I used to be skeptical of Bill Hulstrunk's assert that AccuVent baffles could endure getting dense-packed within an enclosed cavity.
The program: Component A: I stumbled on one" Dow rigid foam backed 5/8CDX for the same rate given that the bare CDX, And that i intend to double it up like a SIP, putting in The underside sheet foam side up and the following sheet on prime (staggered needless to say) With all the foam going through down, giving me 2" of insulation between the plywood.
If you'd like a vapor-permeable materials that is still an air barrier, opt for fiberboard sheathing. But use caulk within the perimeter, and tape with the seams, to make sure that the material is mounted in an airtight manner.
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If you decide not to increase the rigid foam more than the aspects of your roof that have a conventional vented attic, your builder (or an architect) can think of a trim detail that you may be able to Stay with.
Preferably, you need to have an airtight barrier previously mentioned and under your fiberglass batts. If you can reach People two air obstacles, then wind-washing isn't really a difficulty inside of a roof like yours. (It could be in a vented unconditioned attic, not surprisingly, Particularly near the soffits.)
If you'd like to Merge air-permeable and air-impermeable insulation, there are two doable tips on how to move forward. One alternative (based on the code) requires: “Together with the air-permeable insulation set up right below the structural sheathing, rigid board or sheet insulation shall be installed specifically earlier mentioned the structural roof sheathing as laid out in Table R806.5 for condensation Management.â€
When roof air flow can decrease the chance of ice damming, it’s important for builders to limit the movement of heat into roof ventilation channels by together with a number of ceiling air limitations and by putting in thick insulation, to ensure as minor heat as feasible escapes through the property.
JB- I actually must post sketches as Ken did. It would read the full info here most likely save some trouble. For me this was harking again towards the check my source compact roof string.
As your house flexes with modifications of temperature It really is feasible, even very likely that some of the foamed-in air sealing will leak. It'd be value undertaking 2" of open cell foam on the interior aspect of which would be a more flexible and reliable long run air seal.
You're right that this sort of roof assembly would not dry to the interior. But it is not designed to. I'd personally tape the polyiso -- the tape will not result in any problems.
The proper solution to carry on is to setup rigid foam previously mentioned the roof sheathing. There definitely usually are not two answers to this dilemma. Time to carry out the perform is currently. In the event your contractor would not carry out the required work, You will need to hire a unique contractor.
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I've read this previously insulated the steep sides of my unvented mansard roof with six" fiberglass (and I had it inspected), does one suggest I rip that out and use spray or board foam? I have gotten conflicting facts on no matter whether to treat it being a wall or perhaps a roof.