- 1). Pry off the existing frame with your hammer and flat bar. Take off all four sides even if only one side is damaged.
- 2). Measure across the window opening, at the top edge, from the inside of one top corner to the other. Transfer that measurement to a piece of window trim, putting two marks at that distance apart along the bottom edge of the trim. Leave at least 6 inches of space beyond each of the marks.
- 3). Set the trim on your miter saw, facing up, with the marked edge facing back toward the blade and one of the marks (either one) directly in front of the blade. Swivel the blade to 45 degrees out, so it's pointing away from the two marks. Start the saw and cut the trim.
- 4). Slide the board so the other mark is in front of the blade. Swivel the blade to 45 degrees in the opposite direction as before. Cut the trim. The piece should now have a top edge that's longer than its bottom edge, with outward angled cuts at both ends.
- 5). Position the cut trim over the top of the window, where the top of the previous frame was. Line up the two ends so the angled miter cuts rise off the corners. Set the piece by hammering in trim nails along the upper and lower edges of the board, every foot or so.
- 6). Repeat for each side of the window, installing the pieces with the angled ends pressing against each other to make the corners. Caulk around the edges of the new frame.
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