Hey guys, Doing my bathroom next week and I can't seem to find the info I'm looking for. I have 20mm T&G floor boards and they feel pretty sturdy, can I used 6mm backer on these? Or 12.5? Is it worth hacking them up and laying 22mm T&G chipboard with 6mm backer? Cheers. Luke.
Make sure they're firmly screwed down and flat. Prime, then using a 6mm notch trowel, spread adhesive over them then screw down 6mm backer board.
Yes, tile adhesive, should have clarified. Not tubbed stuff though, proper powdered cement based flexible stuff
Get some 18 or 22mm T&G Hardie Flooring. Take up the T&G, clean up joists, lay Hardie Floor using packers if required to get it level. Tile straight on top. https://www.google.com/search?q=hardie+flooring&ie=utf-8&oe=utf-8&client=firefox-b