Studs on slab before UFH & Screed installed

[Greenlane]

Doing an extension and have laid a concrete slab which is due to have insulation and wet underfloor heading and then screed installed. I want to build the stud walls before the UFH is put in, but worry about cold bridging damp up the studs.

Could do with advice on how to fit the sole plates either
1) screwing it into the concrete (could wrap it in visqueen)
2) laying a row of concrete blocks on dpm just below final screed level and then screwing the sole plate into them.

Any practical advice would be welcome about the way to go...

[nod]

Roll a length of dpc out You  can either get drill and plug your sol plate or shoe cute Mf framing to the slab 

I normally cut some 15 mil rips of ply for around the edge of the studs 25 mil more than the depth of your insulation x screed