O
Old Mod
Use the tile backerboards as you described in your post over the ply. This will provide an inert surface for u to tile to. Then lay your u/floor heating mats. Then SLC over the top to create a solid load bearing surface to tile to. Then overlay with Ditra matting. Purpose of this is to protect your finished floor from any lateral movement. With u/floor heating the likely hood of lateral movement is increased because of the heat generated. The Ditra matting will help combat this. Go to Schluter systems web site and look up Ditra Matting. But Ditra Matting has a minimum tile size limit of 50x50mm.So do you think I should not use the tile backer boards ?
Isnt the schluter product for wet rooms as the dressing room isn't and the ensuite is...forgive me if I misunderstand the products correctly...