Installing drywall on a corner is made much easier with the use of corner beads. With corner beads, you can quickly install drywall around a room even if there are some off-angle corners. These drywall corner beads are made out of a thin paper tape that is easily cut to size and secured with joint compound. Working with the drywall tape is much better for inside corners as the metal corner beads will not sit perfectly within an off angle type of drywall corner.
Step 1: Install Drywall
Install the drywall pieces as you normally would. Butt the edges of the drywall right up to the corners. Secure with drywall screws on both sides of the corner. If the edges of the drywall overlap on one side, this will make the installation of the corner much easier. Try to cut the drywall so that one of the edges goes over the top of another.
Step 2: Apply Foundation of Joint Compound
Use a small metal scraper to lay the foundation of joint compound over the seam that forms the inside corner. Start at the top of the drywall and work your way down. Apply the joint compound along one side of the corner, and then work on the other. The joint compound should extend several inches away from the corner to work it into the overall surface of the wall. Usually 4 to 6 inches in total width.
Step 3: Install Tape for Corner
Place the drywall tape into the inside angle and press it into the joint compound. Make sure that it fits securely without any air bubbles or gaps. The tape will hold the inside corner together no matter what the angle of the corner is.
Step 4: Apply Second Coat of Joint Compound
After the tape has been set into position within the interior angle, you can now make sure it is firmly in place by applying a second layer of the joint compound. Spread out the compound with the scraper while maintaining pressure on the drywall tape. By doing so you are not only applying the joint compound, but also making sure the tape is firmly embedded within it.
Step 5: Smooth Out Compound
As you work the tape into the seam, make sure that you keep the joint compound smooth and worked into the overall surface level of the wall. Remember that you will be sanding the joint compound for a smooth surface so you want enough in place in the corner so you do not ruin the tape.
Step 6: Sand Joint Compound
Use a small block of wood, or a special plastic drywall sander, to carefully smooth out the compound with sandpaper. Wrap the paper around the block of wood and sand the joint compound in a circular direction. Start at the top and work at the compound until it is level, smooth and matches the overall surface of the wall. You should not be able to discern any type of increase in the surface level.