possible problem floor

[negsy26]

haha right guys looked at this floor this morning. its 2msq and 300x300 travertine is going down.floorboards have been overboarded with 6mm ply(not 12mm like i was told ! ) screwed down every 200mm. having jumped around on it quite a bit i must say im impressed as it doesnt move at all.the question is tile straight on top or not? underside and edges not been sealed !

 

[Gazzer]

6mm is not adequate, you may as well tile onto cardboard. Do it right and do it once

 

[Dan]

I agree. If the ply is on top of T&G, 6mm isn't enough. Even for ceramics according to the british standard. So you'd need to overboard again with 12mm (to get 18 total) as it's travertine you're sticking down and not just lightweight ceramics.

I understand there will be concerns with the height, T&G + 6mm + 12mm + adhesive + travertine but imagine you having to pay to rip it all up and do it properly in 12 months time. I'd rather do it right the first time personally.

 

[negsy26]

how about 6mm backerboared stuckdown with flexi and screwed down? will that work as that will bring the finished level down a bit?

 

[Time's Ran Out]

If your happy that the floor is sound /no deviation Hardie should be fine.
Follow their instructions cover all the ply joints and tape the boards.

 

[negsy26]

cool, thanks guys. i told the builder next time make it 18mm ply if going on top the floor or 25mm if going on the joists.i think he has taken it onboard !!