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Exceptionally helpful (5*) thread. So, if you must use fiberglass insulation batts, so you dont have use of spray foam or shut mobile boards, what do you are doing? I assume The crucial element is to really make it unvented and incorporate in other air-impermeable layers. I am about to insulate a fresh all-metallic cathedral pitched gable roof while in the Caribean. The plan is to fill the cavity between the four" Z-purlins with R-11 batting (vapor side facing the residing space). For extra heat conduction resistance we plan to roll A different thinner (filleted?) layer of this batting over the top in the purlins (ie among the purlins along with the sheeting).

I such as the detail offered but I wouldn't get in touch with that a cathedral ceiling affliction mainly because it involves ceiling joists spanning at the bottom of the roof rafters. I'd personally contact this an insulated attic.

Ken's element (#ten) does an excellent task of cold local weather safety. It has what we are searhing for: Excellent airsealing at the inside, fluffy stuff in the middle, and very good drying channels for h2o vapor at the very best. By changing from a small permeability sheeting to some high permeability membrane (at top) with venting over, there isn't a more issue for roof rot even though concurrently wind washing is prevented from the bays by the air & water limited membrane with taped edges and seams. It seems to me to become an exceptionally durable assembly.

Is it ok so as to add peel-and-adhere membrane to pick out areas with the roof and continue to keep the rest breathable with tar paper?

We actually don't know if these roofs have right vent channels, or what sort of vent baffles (if any) roofing company augusta ga ended up used to maintain the ventilation gap amongst the best with the fiberglass insulation as well as underside of the roof sheathing.

Thanks Martin - Now I see why my initial plan use this link to get a SIPS envelope was so elegantly easy. It seems like min R-ten sprayed beneath the roof sheathing and afterwards a complete-fill in the bays with batt / fluffy, in addition to a vapor sealed drywall lid will get me the 'sizzling' you can look here (unvented) roof technique the SIPS was through the get go.

Why not merely do it suitable furthermore Create with force handled roof sheathing. Even conventional plywood can tackle wetting cycles over and over greater than our number one Tremendous cheap OSB.

Nonetheless, in certain areas of your place, specifically in the Northeast, insulation contractors are dense-packing unvented rafter bays with cellulose For a long time. Because the process has deep roots in New England, many building inspectors take this kind of installations.

I purchased a catastrophe of the residence that was partially remodeled, It is in Zone 16 (a California designation similar to IRC zones). It's got a 6/twelve vaulted ceiling more than the living/kitchen area area. The roof is held up by two long beams that operate four ft out parallel into the ridge , Therefore there isn't a straight air route a the best way around the peak ridge beam.

So a hybrid tactic needs to be investigated. Dense packed cathedrals with warmside ridged foam to add R, taped, no recessed lighting or other air paths and after that belt and suspenders... Add venting Although there is not any standard 1" vent route.

I would like to promote cost-powerful performance in my marketplace, but not on the expense of roof failure. We've been a 5B local weather zone with 6000 HDD, heating from mid-Oct to mid-April. We may also be very dry at 7000 ft higher than sea amount.

In the choice, if we will not do a ventless roof that way, can we achieve our total insulation requires by combining the above and down below deck R-Values if we top it all with a vented in excess of-roof? Thanks for your time as well as your tips! Dan

Thanks for the input. I see a check out with a structural engineer and 35 sq. of polyiso in my near upcoming.

If you need to Incorporate air-permeable and air-impermeable insulation, there are two doable tips on how to commence. One solution (in accordance with the code) demands: “As well as the air-permeable insulation installed straight beneath the structural sheathing, rigid board or sheet insulation shall be mounted straight previously mentioned the structural roof sheathing as laid out in Table R806.five for condensation Manage.”