Please advise me if possible

[hps1]

Hi guys a customer of mine is doing a build that he wants limestone or travertine flooring laid. Spec is anhydrate screed then an underfloor system called 'maincor floating floor' with the floating floor being 22mm caberfloor. My question is what would you use after that.being that it's a floating floor would ditra on top of this be ok or would it need over boarding again first? Any help would be great help

 

[Ian]

That's an odd floor, why is there heating ontop of anhydrite and not within it? Can't say I've heard or seen that set up before.

 

[White Room]

Sounds a bit of a mish mash and the word floating would worry me....

 

[hps1]

Apparently it gave him the best u value as its a refurb and existing floor levels were all over the place. I know what you mean that's why I thought I'd ask for people's opinions. He said there is allowance in height to overboard if needed. I've only seen this heating between joists before.

 

[Spare Tool]

For tiling over this type of ufh system the floating part (ie.the caber board) should not be fitted, this should be replaced with a minimum 10mm of flexible slc, then as its a natural stone I would also ditra before tiling.

 

[hps1]

Andy have you tiled over this type of system before? Wow over 150m floor that's a lot of slc.

 

[Spare Tool]

Yes I've fixed over 40sqm of marble over this wet system using the method above with no problems at all, jeezus you never mentioned it was 150sqm so its never gonna be a cheap fix, hell of a lot of slc but with what your customer will save in wood and a joiner can be put towards a pallet or so of slc.
To get your 10mm stick pieces of a 10mm tile all over the floor or 2 x 5mm spacers stacked up and keep pouring till you've covered them all...can only advise but whatever you do don't tile a floating chipboard floor