We'd like to tile the floor and walls of our bathroom using a 2cm thick (60cm * 40cm) limestone tile (simyra brossato to be precise). But we're concerned that the tiles will be too heavy for the wall and fall off, especially in the damp shower area.

Does anyone know if this is a problem? If it is, what's a good rule-of-thumb for the thickness of tile we can use.

Many thanks,