Just been asked to do a large wetroom with mosaics. No problem, quite straightforward I think. BUT!! he wants the ceiling tiled too. That's a new one for me, nobody's ever asked me to do a ceiling before, come to think of it I can't remember ever seeing a tiled ceiling before. Standard plasterboards fixed to joists by galvanised boarding nails. Will it take the wieght? I'm probably going to tell him it needs plying out first using screws. Am I being too cautious? Comments would be welcomed.