- 1). Score along the seams where the trim and sill meet the wall using a utility knife to sever any caulk or paint. Remove the trim and sill using a pry bar. Hit the bottom of the sill with a hammer to help release it from the wall.
- 2). Sand away any imperfections left on the wall from removing the trim and sill using sandpaper.
- 3). Measure the dimensions of the window cavity.
- 4). Create a framework of 1-by-1-inch boards to fit around the inside of the window cavity. Use a chop saw, miter saw or hand saw to cut the wood.
- 5). Cut a section of plywood to match the dimensions of the window cavity. Use a table saw, jig saw or a circular saw to cut the plywood.
- 6). Cut a section of drywall using a utility knife to match the dimensions of the window cavity.
- 7). Add the width of the plywood and drywall. Use this measurement to determine the depth at which to attach the 1-by-1 framework to the inside perimeter of the window. Secure the framework with wood screws.
- 8). Cut a piece of fiberglass insulation to fill the cavity. Fiberglass insulation is soft and is cut with scissors. Stuff the insulation into the cavity, behind the added 1-by-1 framework.
- 9). Fit the plywood into the cavity, against the framework. Screw the plywood to the framework boards.
- 10
Fit the drywall into the cavity, against the plywood -- so it lies flush with the surface of the surrounding wall. Screw the drywall to the plywood with drywall screws. - 11
Run a layer of joint compound over the crack between the new drywall and the old wall using a putty knife. To apply, pick up a gob of joint compound on the end of the putty knife and pull it along the seam holding the knife at a sharp angle. Use medium-firm pressure to force the compound into the crack. - 12
Run drywall tape over the crack, on top of the wet compound. Smooth down the tape by going over it with the putty knife. - 13
Apply another thin coat of joint compound to seal and cover the tape. - 14
Allow the joint compound to dry then sand it with sand paper to eliminate all imperfections. - 15
Apply joint compound to the area as needed to match the texture of the existing wall. It may be splattered, trowel-distressed or mixed with wall texture grit. Allow the texture to dry. - 16
Prime and paint the wall using the same primer and paint used on the surrounding wall.
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