Bullnose Corners of Drywall Around Windows
Most interior walls are covered with non-flammable sheet rock, which are 4-by-8 or 4-by-12 sheets of paper-covered gypsum. After it is installed on the wall, edges, holes and imperfections have to be covered with tape and several coats of joint compound (mud) in order to give the wall a smooth continuous look. The corners are usually covered with metal corner beading before being mudded. A special rounded corner beading can be used to give a bullnose effect.
Instructions
Apply the Corner Bead
1. Measure a side of the window. Allow a little extra when measuring the corner bead so that you can make 45-degree angles with the paper edges splaying outward. Use a razor knife to cut the paper and tin snips for the metal.
2. Apply a thin coat of mud to the window edge a little wider than the paper edge of the corner bead. Put the corner bead in place and use the 4-inch blade to scrape away the excess mud so that the paper is flat against the wall and is held in place by the mud. Staple it.
3. Apply corner bead to the other three edges of the window in the same way. Ideally the beading will frame the window much like a picture frame.
4. Wait for the mud to dry.
Apply Joint Compound
5. Use the 4-inch blade to apply a layer of joint compound to the corner beading. Since it is concave along its length it will require a lot of joint compound to fill it. Don't try to do the whole job with one layer or it will take days to dry and will crack in the process. Scrape away as much excess as you can. Wait for it to dry (typically about a day).
6. Add a second layer of joint compound. The goal now is to begin to feather the edges into a smooth transition with the wall. Use your judgment whether the 4-inch or 6-inch blade is best for this layer. You may be able to finish the job with this layer.
7. Sand the second layer with 120-grit sandpaper when it is completely dry. By now the edge should be quite smooth with a few pockmarks and imperfections. If there are too many imperfections or the edge transition is too obvious, use the 6-inch blade to add a final layer, filling these imperfections and feathering the edge out beyond the last one you made.
8. Give the edges a final sanding with 150-grit sandpaper to remove the inevitable ridges left by the blade on the rounded corners.
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