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Finishing drywall seams (Page 3)


Step 8. When the tapered joints are thy, use a 10-in, knife to apply the first topcoat of compound. Apply the compound so itís as smooth as possible. Then remove the excess in a couple of smooth strokes.

 

 

Step 10. Apply compound for the second and final topcoat. Your goal is to spread a 12-in.-wide coat over the joint. Smooth the middle first, then smooth each edge. Clean the knife on the edge of the pan after each pass.

 

Step 9. After the first topcoat is dry, lightly sand it to remove any ridges. Use a sanding block or a pole sander to cover more area faster. Donít worry about filling any gaps, the next coat of compound will take care of them.

 

Step 11. When dry, sand all the joints using 120-grit paper. Use either a wide pole sander or a small sanding block. For best results, go over the joints one more time with 100-grit paper wrapped around a sanding block.

 

PREVENTING JOINT CRACKS

 
The main ways to prevent joint cracks that disrupt taped seams is to use stable studs that wonít twist or warp. That means bypassing (or returning) unusually heavy studs that are overloaded with moisture. As the wood dries out, which may rot happen until the first heating season, wet lumber can shrink and twist enough to pop nails and break open joints.

You also need to set framing carefully so that drywall panels will lie flat. Even small misalignments between standard studs or the extra framing installed around window and door openings can create ridges in the edges of drywall panels that rest on them. You could cover these errors with extra joint com pound. But that can lead to cracking as thick coats dry unevenly. The best bet is to align all studs, if need be, by driving a few extra nails to shift the studs slightly one way or another before installing drywall.

Standard Ĺ-inch-thick panels can bridge the spaces between studs. But they need full support along the panel edges. Typical framing provides continuous sup port along the floor and ceiling, but not always at corners. Several types of drywall clips are designed to reduce wood use and construction time by holding unsupported drywall edges together. Sometimes they work. But sometimes they donít and the corner shifts, cracking the tape and joint compound. So itís best to provide solid-wood sup port on all drywall edges. The time to do this, of course, if when the framing is exposed.
 

 

 

 

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