That s generally because corner tape joints don t always get filled or sanded all the way to the floor.
Installing floor trim inside corner.
Installing baseboard trim is a challenging endeavor that takes years of practice to become proficient.
Use a coping saw to trim out excess material behind the cut so the pieces fit snugly.
Coped joints are ideal for inside corners.
One remedy for this problem is the use of corner blocks.
For inside corners cut the piece to length at a 45 degree angle with a miter saw.
Continue to cut and install trim until reaching the end of the wall.
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.
Trim at inside corners often won t meet evenly despite a perfectly cut cope.
Cut the inside corner of the last piece at a 45 degree angle and continue around the room.
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.
Cut the trim square if it butts into.