G
Graham100
I wouldn't try and fill any gap myself. 2 Options that I can see, move the bath or overboard the wall. I don't see why the plumber shouldn't set the bath properly, he must have seen what was going to happen.
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No F. What I meant is that there is a vertical curve from the top edge of the bath over the end towards the floor. Depending how big the radious is it is likely that even though the tile is over the edge of the bath the top surface of the bath will backfall towards the tiles and hold water.