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I am renovating my kitchen, and we are at the point of deciding on the flooring. We have a new screeded concrete floor.
We are thinking of adding some under floor heating such as Devimat. I have never had it before but whilst we are laying a new floor we thought it might be worth installing some
We will probably go for a stone tile, maybe marble. Will the screed need some kind of bonding treatment (pva or summat) before tiling (and or devimat?)
I see the Devimat just sticks to the floor, can I then lay the tiles straight on top? or will I need a layer of levelling compound?

Any suggestions or comments much appreciated.

if it were me i would use something like Weber acrylate primer on the concrete before you stick the heating mat down. it will seal the floor and provide a good adhesive contact for the mat.

if you use stone it will be an "add mix" for the adhesive anyway although some still just use water and rapid set sp1 but i wouldn't.

the actual mat will give you the instructions on what they require for tiling over it. follow what they specify and they can't blame you if something went wrong.

Hi Cookie,

what form of insulation are you going to be putting under the heating wires?

If you don't insulate with a board (I.E Marmox/ Jackoboard/ Webi/ ****) you're pretty much gonna be wasting money by installing the UFH. Without insulation on the underside of the wires the heat will radiate into the screed, not upwards!

lay the floor like this:
TILES
ADHESIVE
LATEX/OTHER SLC
WIRES
INSULATION
SCREED

Most underfloor heating manufacturers will recommend that you encapsulate the wires/matting in a self levelling compound before tiling.

Hope this hasn't put you off of UFH!

Cheers