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We've chose to insulate on the outside on the roof sheathing every one of the way throughout either side from the gable roof, so as to match up the roof traces.
A. The air barrier can be a vapor barrier, as the rigid foam can also be very likely to be considered a vapor barrier (or near it) in any case.
Thanks - This really is new building, I am the designer / builder, and the more I examine it, I'm liking all rigid - much less fussy. The very best layer of rigid more than fluffy will make my eave far too thick in any case. The air barrier for your T&G ceiling is actually the sandwich of felt and taped three/eight" CDX.
Cellulose insulation can store plenty of moisture. This "humidity buffering" means is cited by some cellulose enthusiasts as An important gain, and in truth this means can occasionally reduce a little moisture problem from creating lots of rot.
It's certainly not limited to an R eighty Passive Residence roof. Choose out the parallel chord trusses and skinny it up.
Preferably, you need to have an airtight barrier above and beneath your fiberglass batts. If you can YOURURL.com realize Individuals two air boundaries, then wind-washing is just not an issue in a very roof like yours. (It may be inside of a vented unconditioned attic, not surprisingly, Specially near the soffits.)
Thanks once more for the solutions. Now I just require to search out an installer With this you can find out more region who is aware the things they're executing (up to now it has been iffy)!
I see the advice is usually that when starting off with board sheathing, a person should location a watertight membrane over the sheathing right before setting up the lowest layer of froth. However, in my case the roofer has currently concluded inserting new felt in excess of the T&G board ceiling/roof deck. Can that felt substitute with the prescribed watertight membrane, listed here in San Jose/Local weather Zone 3?
"When you have installed the code-mandated thickness of rigid foam above your roof sheathing, you’re free of charge to install just as much fluffy stuff as you desire concerning the rafters."
You will be in climate zone 5. I discussed the minimum R-values for that technique you are having in one of several paragraphs higher than, during which I wrote, "In accordance with .
A. I agree. In light on the odor concern, I do not feel that my suggestion to implement Ice & Water Defend was a very good one -- so I withdraw it.
Q. "If I change the felt with Ice & H2o Defend or an analogous asphalt-based mostly solution, I would likely just be jumping from your fireplace in the frying pan, odorwise. This really is foremost me to are convinced the Solitex or Delta goods will be much better."
Ultimately, makers started presenting stiffer options that are improved in a position to resist the pressures of dense-packed insulation. These goods appear and go, and lots of are now not accessible.