Fixing Drywall Cracks. Hairline cracks in drywall, particularly at the top corners of windows and doors, are signs that the wall framing has settled or moved a little—a common condition and one that’s easy to repair. But, if the crack isn’t repaired properly, it’s likely to reappear.
The crack in our upstairs hallway comes back no matter how many times I patch it. What's the right fix?
Seasonal cracks in drywall and plaster are tough to repair. As they open and close, one of two things happens: The surface around the crack crushes and grinds the patch material or it pulls it apart, ripping the material away from the wall or ceiling surface.
You need a super-flexible material and one that can bridge a wide gap. I've used DAP ElastoPatch with good results. The material is about the consistency of yogurt, and you can apply it with a 6-inch joint-taping knife. Although it's pretty simple to use, it'll take you a few tries before you can produce a smooth finish. I'd recommend experimenting on a cast-off bit of drywall first.
![]() Repairing Drywall Cracks In Ceiling Corners
Before you patch, use a painter's 5-in-1 tool to rake out the former repair materials. Then scoop out the patch and spread it on in thin layers. Wipe off any excess (you won't be able to sand it down like joint compound), let the patch dry, then paint.
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Repair Sheetrock Cracks Ceiling
This story appears in the November 2015 issue of Popular Mechanics.
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