We are finalising the plans of a one and a half storey house (c.90m2 footprint). This will be well insulated -with u-values of walls .12, roof .10 and the insulated structural raft 0.10. It will have MVHR, so should have a heat requirement of around 2kw even when -10celcius outside.
I suggested to the SE that UFH pipe would be within the power floated structural raft and this was his response
"I am apprehensive about this detail as there are several risks including damage to the system during pouring of the raft and the requirement to maintain sufficient cover to the reinforcement. I suggest that the more conventional screed-based systems may be more suitable and would likely make the detailing of wet rooms etc. easier."
I would still like to go this route. I am not convinced that there be any material increase in risk from having the pipe in pumped concrete as compare with a pumped liquid screed. Any damage is more likely to come from hobnail boots than the concrete. and in regards to his comment re coverage, this could easily be addressed by increasing the depth of the slab by 25mm. This cost of 2m3 extra concrete is tiny compared with the hassle and cost of 60mm of screed.
I accept his point re the wet room. I am unsure how to address this other than having shuttering to reduce the height of the concrete where the wet room is and screed to hive required levels.
Any thoughts how should I respond.