I have installed cement backerboard around the bath area. We are planning to install 8x12 tiles. I have noticed that the walls are not perfectly flat. When I place a tile to certain spots on the wall (but not all) it rocks. The article on this site suggested applying a layer of thincoat to the walls. Can I do that to "flatten" the walls? If so how do I ensure that is flat? Or should I remove all the backer board (ouch) and repair the studs.
one section the wall bows out (1/4" max) can I "sand" or remove that area to flattens it? The other wall bows in about 1/8" - can I use thincoat to build up?