Tiling bathroom floor. The middle of the room has sufficient fall towards the centre drain. The edge of the room and corners need to be built up 10mm to 15mm. Can I use the glue to build this up. I was told that if I use sand and cement screed then my minimum thickness would be 15mm, so this isn't going to work. I would need to start with 10mm to 15mm at the outer edges then work this thinner toward the centre drain.
