Quote:
Originally posted by cowlick
It is cedar lap.
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Are the corerns mitered (cut at ~45 degree angles and butted up against each other?) If yes, then read on:
Notice I said ~45 degree angles. If each piece of siding was installed flat against the sheating then the miter joint would be exactly 45 degrees. This, however, is not the case. Each piece is layered on top of the piece below it creating a new miter angle. You probably could measure the thickness of the siding at the point where each peice overlaps, then do some trigonometry to calculate the angle, but that would be hard. Instead, you can cut a shim as long as the fence on your miter saw, as thick as the siding at the point where the boards overlap, and about 1/4" tall. Now set the table on your miter saw to 45 degrees, place the shim against the fence, and the set the piece of siding with the thick side against the shim, and the thin side against the top of the fence. Swing the fence to 45 degrees on the opposite side to cut the opposing board. Thats it! Cut a few practive pieces and you are ready to go.
Note: It is much easier to cut the miter edge and then measure to the butt edge than it is the other way around. Also, always cut a little large and then trim if you need.