- 1). Examine the damaged corner. If you pull away loose or crumbling drywall, you'll see a metal or plastic plate that wraps around the corner of the wall. This plate is known as a corner bead.
- 2). Cut away the damaged section of corner bead using a hacksaw. The two sides, or wings of the bead, will likely extend 1 to 2 inches along each wall.
- 3). Remove the cut section of corner bead from the wall using a pry bar. Perform this task carefully to avoid further damage to the surrounding drywall.
- 4). Purchase a new piece of drywall corner bead roughly the same size and thickness of the one you cut away. Cut this new piece along the corner where you removed the old bead.
- 5). Fasten the new section of corner bead to the wall using nails. Place nails every 6 inches along the bead's length, and repeat this process on the other wing or leaf of the bead.
- 6). Sand the surface of the bead lightly with sandpaper to help the joint compound better adhere to the surface.
- 7). Apply joint compound to the corner using your putty knife. You may need to apply several layers until the patched area is level with the rest of the wall. Allow each coat to dry before adding another.
- 8). Wait until the patched area is completely dry, and sand it smooth until it is level with the surrounding wall surface. Work slowly and carefully to avoid over sanding.
- 9). Wipe away sanding dust with a damp sponge or rag, and paint the patched area to match the rest of the wall.
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