Cement Board Meets Drywall At Outside Corner

Cement board is much heavier and harder to work with than drywall but it is almost completely waterproof.

Cement board meets drywall at outside corner. Where these two meet what is the proper way to finish it so it s a nice corner. At some point along the wall the cement backer board will meet with the drywall used in the rest of the room. Outside corners can be difficult with 2 inch mesh tape. It is a long strip of corner piece made out of aluminum paper or vinyl and is installed over a drywall corner giving the drywall a finished and professionally done look.

This joint needs to be flush and smooth in order for the tile or other wall covering to be installed correctly and to create a professional finished appearance. I will just end up painting it. They make 4 inch alkali resistant mesh tape and this stuff works great. The walls were easier because i had tile wrapping around the corner so i just taped and thinset those and tiled overtop.

It s hard to get the tape to fold over the corner and stay long enough for the thinset to set up. Cement board is also used in the walls of showers and bath surrounds where there s going to be a lot of moisture. If you have outside corners to do then you may decide to just get the 4 inch mesh tape only and use it anywhere you. Corner bead is most often associated with drywall.

How to make the transition from cement board to greenboard. Greenboard is a moisture resistant drywall product designed for use in areas of high humidity and where occasional incidental contact.