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Question DetailsAsked on 1/13/2015

are drywall hairline crack common after one year

hairline cracks where walls and ceilings intersect and slightly separated corner bead. this always occurs during the cold months when the weather changes.

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I am guessing this is occurring at interior walls - typically walls running perpendicular to the ceiling joists or trusses, like walls between bathrooms and halls running the length of the house. Happens almost exclusively with attics with either trusses or x-braced rafter/joist system. It is causes by shrinkage of the diagonal bracing wood in the roof supporting framing, which lifts the bottom chord (joists). Your ceiling drywall is attached to the bottom of those joists, so when it lifts the ceiling separates from the wall drywall.


More commonnly severe in houses with moisture issues in the attic, so the wood picks up moisture in the summer, then shrinks when the moisture drops in the winter - can open up as much as 1/2 inch or so in severe cases, which is an indication you need to be looking at attic moisture issues.


In severe cases you can remove the drywall fasteners within a couple of feet of the wall the separation is occurring at, putting in replacement fasteners through the sheet across that area into blocking between the joists, so the ceiling drywall end stays with the wall as the joists lift.


Usual solution, if crack is only 1/8" or so, is to just inject siliconized PAINTABLE latex caulk in the crack when it is open. May have to do this a couple of times, but usually it reduces the crack to hairline or less only when very cold - then a last wipe-over with caulk to seal the crack, let cure, paint.

Answered 4 years ago by LCD




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