Finishing Drywall Corners

This story covers finishing drywall corners with different types of tape.

Finishing Corners

Covering the corner bead at outside corners is easy because the bead itself guides the drywall knife. Run one side of your knife along the bead to produce a smooth, flat joint as the mud covers the nailing flange. As with other joints, apply at least three coats, feathering the joint where it meets the drywall. The bead itself isn't hidden in mud. Simply scrape excess mud off the bead, then paint it along with the drywall.

Inside corners are more difficult. They require taping and mudding. The hard part is smoothing the mud on one side of the corner without messing up the mud on the other side.

Resist the temptation to try to get these inside joints perfect on the first, or even second, coat. Accept that there will be ridges you'll need to sand or knock off in the first two coats. To avoid ridges on the third coat, think of it as a filler coat; press hard on the knife so you fill imperfections instead of leaving behind a thick layer of joint compound. Go over the joints a fourth time if necessary for a smooth finish.

Step 1

Apply mud to both sides of the corner. Fold a length of paper tape in half (it is precreased) and press it into the mud with a 6-inch knife. An inside corner tool embeds the tape and smoothes the joint on both sides at the same time.

Step 2

Embed the tape in the mud by drawing down the knife along both sides of the corner. Repeat this process to apply additional coats of mud. Sand to smooth the final surface.

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