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Install Door Casing/Trim — Install Door Casing and Trim

Beginner2 mins

Part of project

How to Add a Door to an Under-Stair Closet · Step 5 of 6

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To install the door casing (trim), first measure and mark the length of the top horizontal piece. Use a miter saw to cut a 45-degree miter on both ends of this piece. For the vertical side pieces, place a scrap piece of casing on the side jamb and draw a line where the top miter of the horizontal piece will meet it. Repeat this for both sides. Then, measure and cut the vertical casing pieces with a 45-degree miter on one end, aligning it with the mark made. Nail the top piece of casing into place first, followed by the side pieces, ensuring tight mitered joints and securing them to the door frame and wall studs.

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