I'm redoing a bathroom on the top floor of my house. It's in a dormer, so the other side of the bathroom ceiling is the roof. If I insulate the ceiling with polyisocyanurate, and given that this material is closed cell, I'm thinking this will be a problem in that I won't be able to notice roof leaks, as the water will be diverted elsewhere into the house. Maybe this is a silly concern, but in fact, I'm redoing the bathroom because of a roof leak that caved in the ceiling, so it's top of mind right now.
Question: should I avoid using polyisocyanurate to insulate an exterior facing ceiling because it'll prevent me from noticing leaks sooner than later?
Pie, my first suggestion is to address the leak. Contact a roofer and have an inspection done to locate the source of the leak and have it fixed. If you are concerned about future water damage, I would avoid any insulation that is permanent or could restrict access to the area of concern.
Start by solving the problem.
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