Air-Sealing Nail Holes in Existing Roof
I am building an unvented roof in CZ5 on a retrofit/existing roof. The shingles were stripped off – which left holes in the sheathing (rookie mistake). I didn’t have anything to seal the holes and I went ahead and had the roofer tape the sheathing seams and install a mento 3000 membrane.
Question: Is it worth it to air seal the holes from inside ? The scissor truss ceiling/attic is currently all open, so relatively easy to access. All of the fluffy insulation will be in the rafter bays. Since the old roof is 1 1/2″ lower than my new roof addition, on the old roof I will have 5 1/2″ of polyiso, which should keep the sheathing warm.
2nd question. With the attic being conditioned, how important is it to air seal at the vaulted ceiling? . I plan to reinstall a drywall ceiling (vaulted) and it will have some recessed lights in the kitchen. I will have an air handler / duct work up there too. Maybe it would be best to go with open cell in the rafter bays – I believe open cell acts as an air barrier
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