How to Cut Corner Crown Molding Without Cutting a 45 Angle

Cut the end of your first piece of crown molding with a square cut on the table saw. A square cut is a straight, flat cut that creates square, 90-degree edges.

Place the edge of your cut piece of crown molding against the face of an uncut piece at the end of its length. Trace the outline of the square-cut molding's wavy face against the front of the uncut piece. The finished outline should look like a profile image of your molding's square-cut edge.

Cut out the profile image from the edge of your uncut crown molding piece. Create a wavy cut at the end of the molding, using your coping saw. Cut at an angle toward the back of the molding so it will fit flush against the face of the first piece. Sand your cut edges smooth when you're finished.

Place the first piece of crown molding, the piece with the square-cut edge, against the corner of the wall, running along the top of the wall. The piece should run directly into the other adjoining wall and butt up against it. Use a nail gun to attach the crown molding to preinstalled support blocks on all the joists beneath the wall.

Dry-fit the second piece's coped edge to the face of the piece you just installed. Make sure the wavy cut exactly matches the face of the first piece of crown molding. Make adjustments with your file or rasp as necessary.

Attach the coped piece against the other piece's face. Nail the piece to the support blocks near the top of the wall to complete a crown molding corner.