Using Polyiso to Insulate Top Floor Ceiling -- What about roof leaks?

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Posted by: from Vancouver
2/6/2019 at 12:22:53 AM

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?

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Date/Time2/6/2019 at 11:01:13 AM

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.

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