How to insulate dormer cheeks effectively, condensation issue.
I recently noticed at the bottom of the cheek walls in our bonus room dormer, that moisture was present at the bottom. I removed the sheetrock to find frozen condensation and moisture between the insulation and sheathing. The home is recently built and the dormer cheeks are constructing in the following way. 2 x 6 framing, vinyl siding, zip sheathing, R19 insulation with 1/2" thermax, then sheetrock. What is the best efficient way to install insulation that will breathe etc in this area. We are in Zone 7 northern Maine. The rest of the home is built differently, with ZipR to the outside etc. I really need to insulate this from the inside due to access. Pics attached.
Posted Feb 19, 2026, 3:38 PM UTC
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