How to Install Drywall On Standard 90-Degree Outside Corners

What You'll Need
Drywall tape
Screw gun or hammer
Sharp utility knife
Drywall screws or nails
Corner bead or bullnose
Drywall mud
Drywall trowel
Drywall sanding block

Being able to properly hang drywall corners is a skill that can save you big bucks if you own a home. Basement renovations, new room additions or garage conversions can mean savings if you can put up drywalls yourself. Outside corners are tricky and the hardest to accomplish because if not done properly, the edges will be an eyesore to the entire room.

Step 1: Hang the Drywall

If the rest of the walls have been rocked correctly, and the framing was done properly, then the final piece of rock should line up perfectly to the outer edge. If it does not, then cut the drywall to fit, leaving the edge an eighth of an inch from the end.  Make sure the piece of rock is level with the adjoining sheet, and use a small crowbar under the rock being hung to lift it tight, if you are hanging the drywall on the walls. If you are hanging the drywall on a ceiling, then be sure to use a drywall jack so that you do not have to constantly fight to keep the piece of drywall in place. Screw or nail the piece into place, making sure that they are sunk at least every 7 to 8 inches on all the studs.

Step 2: Cut and Hang the Corner Bead or Bullnose

After both pieces of rock are hung, measure the length of metal (or plastic) needed and cut to length, minus an eighth of an inch. Hold the piece of corner bead or bullnose tight to the corner and leave a small gap on each end, effectively splitting the eighth inch gap on both ends. Screw or nail the piece into place. Do not use the exact same holes on each side of the metal or the piece will bend and warp. Rotate the holes that are used on each side.

Step 3: Mud the Corner

Using a small trowel, scoop some mud out of the bucket or box, and spread it onto each side of the corner bead or bullnose. Starting from the top, use a slight, even pressure and bring the trowel downwards towards the floor, wiping off any excess mud that may build up onto the trowel. Let the mud thoroughly dry, and then sand it down. Run your hand over the area to ensure that there are no high or low spots. Repeat this step 3 times so that the mud is completely level with the drywall.

Hanging drywall is a job that has to be learned, and the more you do it, the better you will get. Properly joining 90-degree inside corners can be trying at first, but by following the directions above, you will soon be hanging drywall like a professional.