i'm a bit confused about what to tank my 22mm/25mm plywood floor with in my wet room. from what i've read a decoupling membrane should be used to stop the tiles from cracking due to lateral movement of the wood. however, many people seem to be using tilesafe or dura wp on the floor, which, although would be much easier to lay surely would lead to their floor tiles cracking in the future.....

i would prefer to use durabase ci matting but at a depth of 6mm + adhesive depth surely it's gonna be harder to maintain the gradient around my impey aqua-dec.

tilesafe seems alot easier to use as it self adhesive.

please help.

If I had an Impey aqua dec I would use the Impey/Tilesafe covering!
It will be easier to stick to the tray but it can be a 2 man job to lay as its very sticky and it the same side touches!!!!!!!!!!!
Remember that silicone can react with the tilesafe so don't allow them to come into contact.
Without seeing the floor area it would be difficult to advise on your prepared subfloor - however the tilesafe can be used direct to a sound, deflection free plywood underlay.

thanks john but the tilesafe isn't going to accommodate for the lateral movement from the plywood is it so surely my stone tiles that i want to lay will crack in the future.

'The waterproofing system shall be based around an impervious reinforced rubberised bitumen sheet.The reinforcement shall allow a key to subsequent application of tile adhesive and shall provide good tensile strength while allowing a degree of flexibility.
As I stated only you can ascertain the suitability of the subfloor!

ok so there will be some degree of flexilbility given by the tilesafe membrane although not as much as a decoupling membrane. hopefully this will be enough then. thanks