Installing Floor Trim Inside Corner

Cut the trim square if it butts into.

Installing floor trim inside corner.

Coped joints are ideal for inside corners. The angled cuts the slope of the floor and the irregularity of the walls all work against you as you try to get those tight even corner joints. Installing baseboard trim is a challenging endeavor that takes years of practice to become proficient. Cut the inside corner of the last piece at a 45 degree angle and continue around the room.

One remedy for this problem is the use of corner blocks. But room corners sometimes vary slightly from perfect 90 degree angles and professional trim carpenters have a number of tricks they use to ensure that baseboard moldings fit perfectly. Use a coping saw to trim out excess material behind the cut so the pieces fit snugly. That s generally because corner tape joints don t always get filled or sanded all the way to the floor.

The technique described here modified for diyers will also work for other trim moldings such as door and window case moldings or chair rail moldings. When it comes time to install trim around the corners of your room or walls longer than the typical run of trim use these three joints. Continue to cut and install trim until reaching the end of the wall.