The build

P is fascinated and wondering what goes on next,  is the underfloor heating cables or water pipes and how do you stop the floor crushing it all down into the insulation.  As they say 'watch this space'

 Any big gaps between sheets of insulation will get filled with insulation spray foam and/or be taped.
Next is another membrane (sheet of plastic). Which is just to stop the cement /screed from seeping into the gaps and lifting the insulation and causing cold bridging. Then we lay the under floor heating pipes (water). It’s really tuff stuff. It’s specifically designed to take the weight of the floor on top of it. Also it is clipped into long strips which hold it in position and keep it off the insulation. So the screed will completely in case the pipes .I’ve been told it’s going to be a work out, to tame the beast, into the position we want it. Then the 6cm of screed. That’s going to be a fun job. It’s all getting mixed and wheelbarrowed in and layer by hand! Roughly about 8 tons.

Bubby 'ell 6cm of handmade screed, that's yet another workout.  That's a fine heat store you'll have underneath to keep your tootsies warm. It's going to be really energy efficient when it's all done.  P says thank you (me too), he finds your progress reports very interesting.