How to Drywall Rounded Corners
Rounded corners can add an interesting architectural flourish to your home. They don’t take much more time or effort than standard metal corner beads, so they are a cost-effective way to achieve a striking design effect. To round corners, professionals use a product called “bullnose” corner bead. It is a vinyl corner bead that comes in many sizes and styles. You can find them in building-supply stores. Although specific installation recommendations vary among different brands, you should always embed the bullnose corner bead in joint compound for maximum corner strength.
Install all drywall as normal. Attach each panel to the wall and ceiling studs using drywall screws. The screws should be about 6 to 8 inches apart.
Decide which corners are going to be rounded. Since bullnose corner bead is not as strong as standard metal corner bead, try to choose corners that will not be subject to heavy use. For example, an opening for a walkway may be a bad place due to foot traffic.
Trim back the drywall on the corners you have chosen. Use a drywall rasp or rough sanding block to smooth the edge of each corner. When you are finished, the corners should be even and straight along their entire length.
Measure each corner and then use heavy-duty scissors to cut a piece of bullnose to match.
Use drywall-finishing tools, such as a 6-inch knife and a mud pan, to lay a thick coat of joint compound over a corner.
Apply the bullnose corner bead to the corner, pressing it into the joint compound with your hands. Make sure the top of the bullnose corner bead is flush with the ceiling. Then use your tools to wipe away the excess joint compound.
Hammer in drywall nails every 6 to 8 inches along the length of the bullnose corner bead. This will strengthen the corner.
Repeat the process for each corner until all bullnose corner beads have been installed.
Allow to dry, then sand each corner gently with 100-grit sandpaper.
Re-coat each corner with a thick layer of joint compound, allow to dry, then sand gently. Repeat as necessary until the corners are smooth.
Things You Will Need
- Screw gun or screwdriver
- Drywall screws
- Bullnose corner bead
- Drywall rasp or sanding block
- Heavy-duty scissors
- Drywall-finishing tools (e.g. 6-inch drywall knife, mud pan)
- Joint compound
- Drywall nails
- 100-grit sandpaper
- If you are in a hurry to get the job done, you can use one of the many types of quick-setting joint compound to speed up the finishing process.