Subfloor type for wet UFH and Microcement on upstairs bathroom?

[DeanAlan]

I have wet underfloor heating in place upstairs (https://www.continal.co.uk/) but haven't don't the bathroom zone yet.

Ultimately I want a micro-cement finish and was wondering what UFH substrate people would recomend. The rest of the upstairs uses the insulated panels with pipe run groves in (slimfix) but that is nowhere near stable enough to put microcement over. They have boards for tiles (tilefix).

 

I was wondering if I should clip their regular pipe system (16mm) to the subfloor and then poor a pugmix or other screed (liquid screed) to 25mm (only a 5m2 section of UFH) and then microcement on that.

 

Thoughts?

 

cheers,

-Drean