How to Drywall Curved Windows

Cut and install small strips of drywall to the inside of the window framing. These strips take the place of side and top window stops and may take the place of the windowsill, if you want only drywall around the window. The strips will run the length of the inside window but cut the widths so the outside edges do not overlap the edges of the drywall wall panels where they meet.

Attach bullnose corner bead over the raw corners where the wall drywall and the window drywall strips meet using spray bead adhesive. If you’re creating curves on the top and bottom sections, cut and fit corner bead here as well, making sure the edges fit within 1/4 inch of the side bead.

Apply joint compound with a 6-inch flat trowel to the inside and outside of the bullnose corner bead strips, pushing the wet compound through the holes in the bead so it fills the gap beneath. Work quickly before the compound begins to set.

Smooth the compound flush with the flat sides of the wall and then use a rubber bullnose trowel to smooth the compound evenly over the curved corner. The rubber trowel works best when you place it at one end of the corner bead and pull it evenly to the other end.

Sand the rounded corners once the compound dries completely with a drywall-sanding screen. Sand carefully, the screen quickly removes the dried compound. Just smooth down the surface, but don’t sand all the compound off the bead.

Apply two or three more coats of compound to the bullnose corner bead in the same manner, letting each coat dry thoroughly before proceeding. Sand after the final coat carefully because any bumps left behind will show after you paint the wall.