If the tiles are mounted on drywall the moisture will eventually turn the drywall to a messy mush.
Shower wall tile and joint with dry wall.
In areas of high moisture such as walls in a shower for long term durability it is not advised to install tile over drywall even if the drywall is type mr moisture resistant.
At some point along the wall the cement backer board will meet with the drywall used in the rest of the room.
In areas that are exposed to an abundance of moisture it is better to install a cement board as a backer rather than a gypsum board.
It will be fine to tile over drywall in low moisture areas such as tiling around a fireplace.
If your tiles are in mortar break open a.
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.
Furthermore blueboard is not difficult to install.
Not only is it water resistant but blueboard is easy to find and inexpensive making it an ideal option for those on a budget.
But that doesn t mean you ll have to tear all the tiles off the wall and replace them.
The bottom line is that drywall and this includes moisture resistant drywall should never be used behind tile in wet areas showers and tub shower combinations.