I had a plumber once tell me you can tile onto chipboard ,it was in an en suite , but its get better he even puts chipboard in shower cubicles , then tiles it! I Told the customer you should get rid of your plumber , they weren't to happy as he's been recommended by a family friend , two months later the client rang me to repair everything , lol!!!
Just bumping this thread. If it's not a current topic then don't worry about it for now. Other threads like this can be found in the main tiling forum. If you do want to reply to it, please do. Your information may add value to somebody reading the forum in the future.