Ceramic tile over drywall?
I was talking to a man at Lowe's about my bathroom remodel. He said to use cement board in the shower area (which I understand), but he also said to use the cement board everywhere in the bathroom where there is going to be tile. There will be floor to ceiling tile in the shower area, and tile up about 4 feet everywhere else. The man at Lowe's said that tile will fall off drywall after awhile because condensation will loosen the paper on the drywall and the weight of the tile will just make it fall off. So, I asked about paperless drywall, and he didn't know about that.
So... is it really a no-no to put ceramic tile over drywall? Anywhere in the bathroom? What about in a hallway?
Thank you!