Cement Board Meets Drywall At Outside Corner

At some point along the wall the cement backer board will meet with the drywall used in the rest of the room.

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. Outside corners can be difficult with 2 inch mesh tape. Durock is a type of cement board that is water and moisture resistant. The walls were easier because i had tile wrapping around the corner so i just taped and thinset those and tiled overtop.

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. These areas are pretty simple to prep but there are a few. Corner bead is most often associated with drywall. They make 4 inch alkali resistant mesh tape and this stuff works great.

The shower ceiling is hardibacker and the wall outside the shower is drywall. Cement board is much heavier and harder to work with than drywall but it is almost completely waterproof. 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.

I will just end up painting it. Greenboard is a moisture resistant drywall product designed for use in areas of high humidity and where occasional incidental contact. 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. 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.