Door casing, or trim, finishes the look of a newly installed door or can update the style of an older doorway. Casing conceals gaps between the door jamb and the rough opening.
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DK - Do It Yourself Home Improvement © 2009 Dorling Kindersley Limited
Mark and cut the top piece to length, mitering each end. The most important part of installing door casing is making sure that you cut the miters so that they fit together at the corners. Some DIYers choose to install the top piece first, making sure it is level and on the mark, before installing each side piece. With the top in place, you can use the top miters to mark the side pieces. If you need to make adjustments, use a sanding sponge to gently remove material and shape the miter.
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