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Your plan will function great, as long as being the layer of rigid foam on top of your roof sheathing has an R-value of at least R-twenty. Should you be using XPS, you need at least 4 inches of froth. If you're using polyisocyanurate, you may need at least 3 inches of foam.

Am i able to get some much more commentary on the "complete roof" of Ice & Drinking water Defend? I believe this had quite little to accomplish with the failure. The main reason why I question is I've the same "full roof" style and design coming up, Nonetheless, the rafter bays are all straight runs with soffit vents, ongoing vent baffles (one/2" plywood) and continuous ridge vent. Dense pack cellulose, 2" XPS down below 2x10's, air restricted drywall (XPS could possibly be sealed up way too).

A. Should your goal is to setup a great air barrier, then drywall is absolutely enough, as long as you seal all penetrations to stay away from air leakage. For additional on setting up drywall in an airtight manner, see Airtight Drywall.

The Hazard is that inside dampness will migrate towards the cold sheathing, bringing about condensation or dampness accumulation.

Q. "I'm asking yourself if I really should furr out the rafters to receive the desired thickness of spray foam, or if putting in several inches of polyiso foam towards the underside of your rafters, after the spray foam, could do the job?"

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The plan is to put in it (from the inside of the home) about a similar time the drywall is place up. I'll instruct my crew to be certain there aren't any air pockets inside the purlin cavities & no air movement to the latter.

Even so, in some areas from the nation, particularly in the Northeast, insulation contractors have already been dense-packing unvented rafter bays with cellulose For a long time. Because the method has deep roots in New England, many creating inspectors acknowledge these types of installations.

I would roofing company corpus christi tremendously recognize tips from experts: Chunk the bullet and hazard of spray foam insulation, or mail the builders again up over the roof in December to cut ridge and soffit vents?

one. You must get an engineer To guage the safety of one's 2x4 rafters. my response "Furring down with 2x2s" doesn't Increase the capability within your 2x4s to bear the snow load. It is really achievable that an engineer will advise you to definitely sister 2x8s or 2x10s on to your current 2x4 rafters.

To comply with the code -- also to adopt a making system that is significantly less risky -- you might want to possibly consist of ventilation channels or you need to install a layer of spray foam within the underside from the roof sheathing, next the tips defined in the write-up on this webpage.

I have created dense-packed unventilated roof assemblies various periods without challenge. Obviously I have not torn into them both. I want to see additional samples of failures in these kinds of assemblies should they're available.

Even though the GBA website by now incorporates several articles or blog posts on The subject, we continue to receive Recurrent questions about the best technique to insulate a cathedral ceiling.

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