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Question DetailsAsked on 3/14/2017

Attic has knee walls . 30feet x30 feet room with 9 ft ceilings. What causes the drywall tape to turn loose?

We built a 30X30 garage and built it tall .
The attic has 9 ft ceilings with 5 ft knee walls.
The drywall tape turns loose in places and rinkles in others
How can I fix it and it stay fixed?

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2 Answers


Almost certainly moisture causing it - could be moisture from the room passing through poorly sealed joints (like a sheet joint gap not filled with drywall compound behind the tape) and condensing in the cold drywall, causing peeling of the tape. Or could be high moisture in the crawlspace behind the kneewall condensing and causing peeling. Or just excessive moisture in the room or inadequate kneewall insulation on the back, so the wall is getting cold enough to condense moisture directly on the wall surface (though normally that would also have wall staining and/or runs and maybe mold issues showing up as well).

The crawlspace behind there should be well-ventilated - on peaked/gabled roofs with an air passage over the kneewall at least 2 inches high (with baffles or "chutes" as necessary over the top of the kneewall to keep room insulation from blocking the airflow) and preferably full rafter/truss top member depth air passage, to allow air to flow through the crawlspace at each stud bay eave vent, then up over the kneewall, and up the rafter bays to a ridge vent.

If you get back in there (should be an access hatch in the kneewall on each side, or maybe on ends if room is not full length of the attic), especially when it is (and has been for some days) quite cold outside, and look for condensation or frosting in the crawlspace, insulation, on the framing, and on the underside of the overlying roof sheathing. If you have any of those (though if quite cold outside a thin frost hazing is pretty normal), ventilation is inadequate or there are penetrations in the walls/ceilings leading into the attic letting warm, moist household air up in there - or you have leaks from the roof.

If condensing moisture from the interior of the room, then that means the room is kept too cold or the kneewalls are not adequately insulated.

Buying a decent humidity gauge (not just one of the couple of dollar color-strip thermometer type) and checking inside the room, both center and at the walls, and in the kneewall area might give an idea of whether you have too much moisture - over about 45-50% is where mildew/mold starts multiplying, and anything over about 55-60% is asking for trouble. Of course, 100% is where condensation non surfaces begins.

The peeling tape might be pretty much eliminated (though would do nothing about the excess moisture issue which can lead to mold or rot if allowed to persist) by replacing it with fiberglass drywalll tape and taping compound designed for use with green board drywall (like for use in bathrooms) which is waterproof - normally a latex or acrylic taping compound, available in 1 quart and up sizes. Dap is one of the more common brandnames found - just be sure the product is rated for use in damp areas on green baord (water resistant drywall). Generally requires a primer like Kilz over it before painting, because paint does not stick to it well.

Answered 3 years ago by LCD



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Answered 3 years ago by Member Services

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