I had a new bathroom fitted last year by a local plumber/tiler. The problem is that I have serious leaking from the bathroom into my bedroom after a shower. The problem is definitely leakage through the tile grout. You can see cracks running through all the grout on 2 of the 3 walls. The tiles have been fixed to a stud wall along one side and to plasterboard (on the back of the heating cupboard on the other wall). I cannot see any cracks on the third wall which is brick but well away from the shower. The question is - do I just get the grout replaced - i am not sure if my fitter (who has gone awol) used a flexible grout or is it likely that I have movement in my walls. Should my tiles be removed and an aqua board? put in place.