Corner beads give outside corners a profesisonal finish.
Drywall panels give your room a smooth, professional surface, suitable for painting or for hanging wallpaper. In a standard square room, there are only inside corners, which are relatively simple to tape and finish. However, a structural addition inside a room or a hallway that turns presents an outside corner. With basic drywall tools and supplies, you can create a straight, crisp outside corner.
Instructions
1. Measure and cut an outside corner bead about 2 inches shorter than the length of your wall. Corner beads come in plastic or aluminum and they provide a rigid corner shape that fits over the rough-cut edges of the drywall panels.
2. Center the corner bead over the edges of the drywall, leaving an inch free at the top and bottom.
3. Insert drywall nails into the nailing strips on each side of the corner bead, at the rate of one nail every 8 inches. The heads of the nails should be flush or slightly depressed.
4. Smooth about ½ cup premixed joint compound over both sides of the corner bead with a 6-inch drywall-taping knife. Use long, even strokes to apply a thin coating of joint compound that will fill the holes in the nailing strip and cover the nails you inserted.
5. Feather out the edges of the damp compound by switching to the 10-inch taping knife, holding it flush against one wall and extended about 1 inch over the outside edge. Use long strokes to evenly distribute the compound. It's okay if a little excess joint compound remains on the edge at this point.
6. Repeat on the other side of the outside corner and then let the joint compound dry completely.
7. Sand the dry outside corner to remove rough spots and any excess compound that may be on the ridge. A drywall sander features a pad, covered with a replaceable screen. Hold the pad flat against one wall, with the edge extended over the wall corner and sand up and down. Repeat on the other side for a sharp corner.
8. Apply another coat of drywall joint compound. Since the compound shrinks slightly as it dries, you'll need to apply two or more light coats, letting each coat dry and sanding it before the next coat.
9. Sand the final coat smooth to form an even corner edge, and you're ready to paint or hang wallpaper.
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