Can roof sheathing dry with flash-and-batt?
I have read a lot on this site about flash-and-batt, but I can’t seem to find anything definitive about the potential danger of sandwiching the roof sheathing between impermeable spray foam below and roofing underlayment above (especially peel and stick). Isn’t it safe to assume that inevitably the underlayment may leak and some point and let moisture into the sheathing? If/when this happens, does the sheathing have any chance of drying?
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