Retrofiting undertile heating.

[Deluks]

Our current kitchen floor is a bit tatty, the tiles have been down about 10 years, were never sealed and are dirty, a few are cracked. It's all down on a solid concrete base without insulation, so not looking forward to this winter as the floor gets rather chilly.

The 2 options are to lay vinyl over the whole lot, or retile, but the latter option seems a little pointless unless we incorporate insulation of some kind.

The big Q is: After removing the current tiles, how much concrete (depth) will have to be removed if I then want to lay down 10mm insulation board/screed/heat mat/adhesive/tiles?

...and how best to get the concrete up to an even depth.

Not looking to replace anything else as the units are only 18 months old so will tile just under the units. The kitchen is only small, will probably just need a 2sqm heating mat for the area that gets walked on.

We've plenty of sockets so can happily lose one to connect up the thermostat.

 

[wap]

just stick insulating boards onto the concrete lay the ufh and tile directly onto it. you will then have 10mm board 5mm adhesive under the board 10mm ties and 2-3mm ufh. overall roughly 30mm thickness where as now you will have about 15mm thicness depending on existing tiles

 

[Deluks]

You mean I can the whole lot in 30mm depth? so if removing tiles and adhesive gets rid of 15mm I'll be raising from current level by 15mm.

I didn't realise you could tile straight onto the thermal boards, I always thought you needed to screed on top. Do the thermal boards need to be laid on a bed of adhesive, or should I just screw them into the concrete?

 

[wap]

you stick the boards down with adhesive mate. warmup do ufh and boards to match. just google warmup and it should be easy to find from there