Hi,

I am looking to install underfloor heating in a new build conservatory. I
will be using 50mm Celotex insulation and UFH pipes attached to a steel
mesh. I will be getting a local tradesman in to do the 75mm screed.

I have seen various UFH information that talks about using an additive in
the screed. What screed mix should I be looking for i.e. sand/cement/grit
ratios and what type/where can I get the right additive for this
application?

Cheers

Steve..