I'm installing a cable floor heating system and slate tile on a concrete on slab floor. I have lots of questions.
There are a few options I'm considering:
A) Put a border of cement board (hardie) around the perimeter of the room. I was going to run the cables in the middle then cover with thinset or self leveling compound. Let it dry then on top of that I was going to use Ditra.
My question is does this make sense? Also how do I adhere the Ditra to the self leveling / hardie layer. I'm seeing you need to use unmodified thinset for one and not the other?
B) Another option is to use a liquid crack suppression direct on the cement then putting the cables on that and selflever over them, then tile.
I'm looking for the most efficient way to prevent tile cracking without impacting the heating systems efficiency.
The floor cracked in the past due to water issues but they have been fixed.
Sorry I don't know your first name. A perimeter border is a good idea,
BUT, one with the ability to create a "soft joint". This means to absorb any
thermal expansion caused by the floor heat. Send me a personal E-mail
via the link below and I can explain more.