thin thermal insulation under stone tiles

[AJH]

I've got an uninsulated concrete floor in my kitchen which I want to have Travertine tiles laid over, the tiles will continue into an extension which has an insulated slab with the same FFL I'm wondering if there is an ultra thin insulating material that can be put between the uninsulated concrete and the tiles. I'm thinking that 4mm exterior ply would give some thermal break if it was stuck to the concrete but would this cause problems with the travertine do you think?

AJ

[timeless john]

Without knowing the insulating properties of Ditra matting (if any) its design as a uncoupling membrane would make it almost ideal for your situation and materials (travertine) intended.
I'd be aware that you should have a movement joint between your slabs and this should continue to the face of the tiles.
I'd not consider the plywood option in conjunction with Travertine.

[AJH]

thanks, you mention uncoupling, do you mean that travertine shouldn't be laid directly to the concrete? Also would you explain about the movement joint please?

[Mike]

if you have 2 seperate floors you will need an expansion joint where they meet, you can purchase an expansion joint or if you have a grout line across the transition you can use a colour match silicon in the joint

[AJH]

I right I see, thanks, AJ