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Interior Trim Basics (page 4 of 8)

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Step by Step Instructions with Photos 1 - 4

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2. Cut two 12-in. Long test pieces of casing at opposite 45-degree angles on the power miter box to check the fit of your casing on the door jamb.

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3. Hold the test pieces on the reveal marks to check the fit of the miter in the corner. If the joint is even slightly open at the top or bottom of the miter, adjust the angle on the miter saw slightly, recut both pieces and check the fit again. Take your time—you may be surprised how tight you can get the joint to fit.

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4. Cut the side casing about 1/2 in. overlong and hold it in place on the door jamb along your reveal marks. Use a sharp pencil to transfer the top reveal mark from the head jamb to the side casing. Then cut the miter at the angle you established with your test pieces.

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