robbyraven

Would the suspended floor really benefit from a 12mm ply reinforcement? This floor is brand new, 2x8 joists at 400mm centres with a 3.6m span (above building reg requirements) with 22mm T&G moisture resistant chipboard, glued and screwed. I can see how ply would benefit an old floorboarded floor, but would it help here?

The floating floor is 22mm T&G chipboard glued together over 50mm grooved polystyrene containing under floor heating pipes, over 40mm celotex to bring it up to building regs insulation requirement, all over an existing concrete slab.

How about this as a plan:

Ditra matting over the floating floor, followed by solid-bed single part flexible adhesive, followed by the stone

Over the suspended floor, thick solid-bed single part flexible tile adhesive directly onto chipboard.

Would this cause major problems, and if so, what would they be?

I'm told I could use 2 part flexible adhesive and dispose of the Ditra, but with irregular thickness tiles, the 2 part adhesive would cost much more than the Ditra matt and single part adhesive combined. Does this sound right? I'm frankly amazed at how expensive 2 part flexi adhesive is.

Thanks again,

Rob