* Outline the damaged area using a framing square. (Cutting four right angles makes it easier to measure and cut the patch.) Use a drywall saw to cut along the outline.
* Cut plywood or lumber backer strips a few inches longer than the height of the cutout. Fasten the strips to the back side of the drywall using 11⁄4" drywall screws.
* Cut a drywall patch 1⁄8" smaller than the cutout dimensions and fasten it to the backer strips with screws. Apply mesh joint tape over the seams. Finish the seams with three
coats of compound.