Skip to main content

Install Door Casing Sides — Install Door Casing and Trim

Beginner2 mins

Part of project

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

Helpful?

In this video

Begin installing the door casing (trim) around the door frame. Measure and mark the vertical trim pieces first. Position a trim board in place, using a pencil to mark where the inside of the 45-degree miter cut should go. Use a 12-inch speed square to mark the 45-degree line onto the trim piece. Cut the trim with a circular saw (or miter saw for precision). Repeat for both vertical sides. Attach the vertical trim pieces to the door frame using a nail gun and 2-inch long nails, aiming into the vertical studs behind the drywall. It's acceptable to lift the trim slightly to meet your desired top alignment.

173.0K views4.1K