Outside wall corners are seldom perfectly square, so simply cutting both crown pieces to 45 degrees usually won’t cause the moldings to meet with a crisp outside corner.

Clean up the coped cuts with a file or sandpaper. A round file works well for tight curves. Pro tip: Keep a scrap of the trim handy so you can check the fit as you fine-tune the cope. With complex ...

Outside corner molding must be joined with a miter. First, determine the length of molding by placing it along the wall and against the corner. Use a pencil to trace the inside dimension ...