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 1/4 inch (6 mm) from the inside of the door frame. This will be your guideline for installing the trim.
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