W
Wetroom specialist
Sorry, this reply may be a little late but I haven't been on here for a while. A number of things took my eye. Firstly it looks like an old AKW Drain, they have a range that they don't promote much called "Level best". If it is, then there is a strong possibility that it's an AKW floor former possibly / probably TuffForm. It looks like the installer has then sourced his own cheaper tanking, possibly Homelux fleece membrane at a guess, because AKW have never sold Homelux tanking to my knowledge. While you have the UTH exposed you might want to move it away from the drain a little if possible. Now it should be evenly spaced so you may not be able to do this at this stage. But UTH should always be kept around 150mm away from the drain. Don't worry, it isn't dangerous. The reason is so that if you were on holiday for example but your UTH was on a timer. It could evaporate the water in the trap. This will result in a smelly bathroom when you get back. Finally, it could be that the floor hasn't been strengthened enough underneath the floor former so that there is NO MOVEMENT. If this is the case (and it's what I suspect) the floor former will move, the adhesive will then fail due to the movement along with the grout. This will result in this situation. There are two valuable lessons here. Always buy your wetroom products from one source (guarantees are not so easy to get away with or avoid). And always always always support your floor former with 18mm ply between the joists, even if the manufacturers say that you do not need to. Tiles do NOT like ANY movement.
