If you have no flex in the wall system than you add/install ceramic tile. If you have any movement in the wall system than any tile installed will either pop off the wall or crack when the wall moves and flexes...
We have always used a waterproof membrane that is applied to the wall structure with an adhesive... and than the tile goes over this membrane... but the wall needs to be sound...
Hope this helps..
Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction