- 1). Sit your circular saw on a replacement board, on a flat surface, and adjust the depth of the blade to the depth of the board (generally 1/2 inch to 3/4 of an inch).
- 2). Run the saw over the full length of one of the damaged boards. Don't cut into the edges of the board, but keep the blade inside the perimeter of it.
- 3). Cut additional lines in the same fashion, running them along the length of the board at slightly different angles, so they cross one another repeatedly. Continue until pieces of the wood start coming out in chunks. Carve out as much of the middle as you can without touching the edges.
- 4). Use your hammer and chisel to knock the edges of the board into the open area at the center. Get the edges completely free and away from the adjacent boards.
- 5). Set the appropriate replacement board upside down on a work surface, so the bottom is facing up at you. Slice off the bottom half of the groove that runs along one side, using your razor knife.
- 6). Press the side of the new board that has the tongue running alongside it into the groove of the adjacent board, then drop the rest of the board into place. The altered groove will allow it to drop over the tongue of the board on the other side. Nail the new board down with a nail every 10 or 12 inches using a nail gun. Repeat for each damaged board.
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