ufh on to existing tiles

[fred22]

I am quoting for a kitchen floor job where they want ufh onto old tiles then new tiles above. Should I lay insulation board first to keep heat in? How do i fix the boards? Adhesive? Worried of raising floor height too much.
Dave

[Dave]

I think the old tiles should be removed first.....what is the substrate..?

[cornish_crofter]

Hi Fred

1st post, welcome to the forum!

I think Dave's right. The old tiles should really be lifted first. I would be interested to know what the substrait is underneath.

Assuming it's concrete with screed then a floor scraper can be used to remove old adhesive.

Link to floor scraper: http://www.screwfix.com/prods/46108/...05Y4CSTHZOCFFI#

I suspect that the customer has been told that you can tile over tiles and it will save you money, but hasn't thought about the implications of this approach.

[fred22]

yes think he wants a quik fix. Will look at job tommorw, hope the tiles arent really old!
Cheers chaps, will let you know how I get on