I have been messing around with acoustic problems for a few years now. I had to travel up to Leeds today (320 mile round trip). When I got there, there had been a serious leak. Looked like it had been going on for a while. The bottom layer is Cloud 9, then 2 layers of 18mm plaster board. Proper soaked, liked paper mashe. Opened the floor up, had a look, packed up, f-d off. I will be back though, scooping up gloop, and barrowing it out.