- 1). Insert a wide putty knife behind the interior wood trim surrounding the window. Insert a pry bar behind the trim, in front of the putty knife, and pry the trim away from the wall. The putty knife will protect the wall from damage. Remove all interior trim surrounding the window. Set it aside for reuse.
- 2). Cut any aluminum or wooden molding surrounding the exterior of the window with a utility knife. Remove any caulk surrounding the window frame.
- 3). Tilt the old window frame out or in, depending on which way it wants to go. Remove the window with the help of an assistant.
- 4). Scrape away any insulation or caulk from the rough opening with a putty knife. Set the insulation aside for reuse.
- 5). Measure the rough window opening with a measuring tape so you order the right size replacement window. Measure the width of the opening at the top, middle and bottom. Measure twice, then write the measurements on paper. Measure the height of the rough opening in the same way -- at the left, middle and right side -- and write down the measurements.
- 6). Bend down the replacement window's surrounding flange so it is perpendicular to each side of the window. The window flange is the thin, metal piece with predrilled holes all along each side.
- 7). Squeeze a thick bead of caulk along the interior side of the window flange. Set the bottom of the replacement window on the rough opening with your helper's assistance. Tilt the replacement window into the rough opening so it is standing in place. Check all four sides of the window with a level. Insert wooden shims between the window and the opening as needed to level the window.
- 8). Hammer galvanized nails through the predrilled holes on the exterior of the replacement window and into the sides of the rough opening.
- 9). Fill the gap between the rough opening frame and the brick with two-by-four boards cut to size and thick beads of caulk around the flange. After the two-by-fours are set in place around the window, fill the rest of the gap with spray urethane foam insulation.
- 10
Place the insulation you pulled out earlier into all gaps surrounding the window frame. Replace all trim removed earlier, using a hammer and finishing nails. - 11
Secure any wooden shims you used by hammering finishing nails through them on the the interior side of the window. Score the shims so they are even with the window frame, using a utility knife. Break off the protruding pieces. - 12
Reinstall the interior trim pieces, using a hammer and finishing nails. Fill all trim nail holes with wood putty to match the trim color on the exterior and interior of the window.
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