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Your plan to put in a stack of rigid foam rectangles in Each and every rafter bay is known as the "Slice-and-cobble" approach to insulation. It is a way typically picked by homeowners, but never decided on by insulation contractors.
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Here is what you wrote: "I do know that there is no caulk/sealant amongst the facet in the beam plus the spot where by the drywall butts from it, so You will find a smaller air hole there. My memory is that fiberglass insulation was utilised. There is undoubtedly no vent during the roof."
Your proposed assembly is a code violation. If you prefer an unvented roof assembly, you should preserve the roof sheathing heat with spray foam or rigid foam. Cellulose insulation is assessed as an air-permeable insulation and can't be used in such a roof assembly.
As The top of our nearby HBA, I have strenuously identified that foam in excess of a vented flat roof assembly does not offer the insulation values promised. Some builders have instructed they could basically seal and stucco more than the stucco vents and reduce the air flow.
Builders solve this problem by furring down or scabbing on additional framing underneath the rafters to deepen the rafter bays. A further method is to incorporate a layer of cross-hatched 2x4s, sixteen inches on center, mounted beneath the rafters."
Yesterday we blew the insulation and mounted the SIGA Majcoat on the CAPACES Leadership Institute. There was more than 8,000 Cubic feet of insulation to install, so our insulators experienced 2 of their blower trucks and a good crew on site. They ended up blowing cellulose as fast as they might as well as the the rain was heading our way. Under forty five minutes following the why not check here insulation was accomplished we had finished the Majcoat and ended up occupied taping seams.
The GBA website does not give custom made specifics. That's what an architect or an engineer is for; I advise that you retain the services of one.
Set up a layer of closed-cell spray foam versus the underside on the roof sheathing, and fill the rest of the rafter cavity with an air-permeable insulation. Again, such a assembly is built to dry to the interior, Hence the assembly really should never ever incorporate an interior polyethylene vapor barrier.
So a hybrid strategy has to be investigated. Dense packed cathedrals with warmside ridged foam to add R, taped, no recessed lighting or other air paths link and after that belt and suspenders... Include venting Despite the fact that there is not any standard 1" vent route.
U.S. setting up codes never need the use of inside vapor barriers, even in cold climates. The things they do need is definitely an interior vapor retarder. This prerequisite can be contented with kraft dealing with on fiberglass batts or vapor-retarder paint.
Like Doug's structure, the focus is on making a high perm layer for drying to the exterior, that will still allow venting whilst blocking wind washing during the fluffy stuff.
Thanks for finding the thread higher than...note that in put up #seventeen, Robert Riversong talks about the "vented around roof". I concur with you that this process warrants some attention for cathedral ceilings.
I'm guessing that neither of such information exactly fits your needs. But as I famous his response previously, If you need a personalized element, you almost certainly have to have to hire an architect or an engineer. Fantastic luck.