Looking at @NSS blog http://strawberrytreelodge.blogspot.co.uk/2015/09/stage-3-jetfloor-topsheet-ufh-pipework.html , we have the same floor build up but are currently aiming to board out the Jetfloor and leave putting in the final insulation layer and ufh after the frame has gone up. This to to avoid damaging the ufh during erection of the timber frame.
Would this be better than putting in the insulation & ufh now?