Condensation in dormer ceiling

Old 03-30-23, 09:50 AM
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Condensation in dormer ceiling

Just noticed a bubble in ceiling drywall. It's at the bottom of the angled dormer joist bay. In the attic the unfaced side of the batt insulation bends up about 10 inches and snug to roof sheathing. Installers probably didn't want to cut it to size.

Could that warmth against cold sheathing cause condensation?
Old 03-30-23, 11:16 AM
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All attics/roofs that are under insulated, under ventilated, without air sealing or vapor barriers, that are in close proximity to both the heated interior and the cold exterior will get condensation or frost under the right conditions if you live in a cold climate. Cathedral ceilings are the most problematic in this regard because they typically meet most of the previously mentioned things.
jeweler voted this post useful.
Old 03-31-23, 06:02 AM
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Just noticed a bubble in ceiling drywall.
Is it in a spot that would have been taped? Could just be an issue that the tape was not set properly, a picture would help!

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