Hello everyone, I tried to avoid asking this question as I'm sure you're all sick of seeing the same questions being asked, but after days of research I am unable to choose the best flooring to put down for a small ground floor wetroom on a suspended timber floor. 1.65x1.85m room dimensions So I have taken up all the water damaged chipboard and want to replace it with something of a similar height to avoid having a step going into the bathroom. I have bought a 22mm tuff former from screwfix, so I also need to match that height From what I've seen from various forum are these are the suggestions. 1) 18mm ply wood then 6mm aquapannel (tile board) giving me a 24mm height floor. But unsure how prop up the former by 2mm or if it's close enough. 2) 25mm ply wood floor, then get 3.6mm ply and place that under the tuff former to try and level it. 3) I've seen some 22mm tongue and groove plywood from travis perkins. "Selex Structural Plywood B/C Grade Tongue and Grooved 2425mm x 600mm x 22mm" on the manufacturers website it says this is actually 21mm height but I'm thinking I could put some uncoupling membrane on top to get it level with the tuff former. I'm thinking option 3 might be the best. But I know that some people say 25mm ply is the minimum for laying tiles? Any advise would be greatly appreciated!!