Plastic corner beads provide a hard, straight edge at the corners that protect the edges of sheetrock from damage. Available in round and square designs, the corner beads lap over the adjoining sheetrock and are faired (smoothed) out with sheetrock mud. Once the mud dries and is sanded, it conceals the edges of the trim and produces a nice finished look that flows, uninterrupted, around the corner.
Instructions
1. Rasp the corners and edges of the sheetrock at the corners and remove any lumps or bumps and hard corners. Measure the corner from the ceiling to the bottom of the sheetrock. Cut the corner bead to this length with the tin snips. Do not overlap the corner bead if the corner is taller than the strips of corner bead. Cut the corner bead square and make a butt-joint. Try to orient the butt-joints to be close to the ceiling or the floor. Avoid placing them close to eye-level where they may be more readily spotted.
2. Lay the corner bead in position over the corner. Nail through the edge of the bead into the framing on each side of the corner near the center of the strip. Nail down from the center, placing the nails in pairs on each side of the strip to keep the strip straight and even. Nail up from the center in the same fashion, once the lower half is completed.
3. Mud the joints where the corner bead overlaps the sheetrock. Scoop up a knife full of mud and apply a heavy coat in one continuous motion to the joint, starting at the bottom working up. Return to the bottom and hold the knife handle vertically while applying more pressure to the side of the knife away from the bead. This will make a smooth transition from the sheetrock to the bead by leaving more mud on the bead edge and less on the wall. Continue this process all the way up one side and then repeat it on the other side.
4. Allow the mud to dry and lightly sand it with the pole sander to fair out any imperfections. Apply a lighter, skim-coat to the corner joints to catch any voids or hollows from the first coat and allow it to dry. Sand lightly once the mud has dried. The corner is now ready to be primed and painted.
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