that is an interesting way to do it, must mention to the builder. I must ask if the tiler does this work or is it a separate person. i can't have a wet room, this is what I wanted but the builder refuses to put one in as he says he will not be responsible for it leaking. As this is a house off plans that we have changed around, he is reluctant for any changes like this, as we have only paid him 10% and balance on completion.