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Hi, Following on from advice received in the other 'world' (ebuild) I now have my final design for floor buildup in my renovation of a 1950s bungalow: 15mm Finished floor 100mm reinforced concrete with UFH (ie meshed) 275mm EPS70 DPM Sand blinding 100mm compacted hardcore 'type 1 MOT' Existing in-situ compacted ground Currently digging up 18t of hardcore and 30t of soil so that get the necessary depth. I've seen sense to get some contractors in for that part though. Back and knees are tired from all my toiling. But the rest I pan to do (i.e. insulation, UFH laying, concreting will be left for someone else as it needs to be level and power floated). Having spent many hours reading up on ebuild I still have some questions remaining: 1) House has PV panels and the original idea was to have an ASHP. Originally house had oil which I have stripped out. I did lay in gas pipeline for kitchen (wife only does gas...) but due to escalating costs for piled foundations for the extensions I will now fit a combi boiler. Perhaps one day when it makes economic sense will I change to ASHP. I presume that will be a fairly easy swap-over? 2) I'll have a utility and small bathroom where I will probably extend the loops from hallway into. But then also had a rad in each room also. Should I connect the rads to the UFH manifold or direct to the boiler feed? I presume the latter? Or should I have electric towel rads instead? Running costs/efficiency is my main concern. I can route plumbing to boiler feed up through the wall and into loft without too much aggro. 3) In a similar vein, I have a 2 storey extension (175mm sips) and am wondering whether to have UFH or to go for rads instead on 1st floor. The only reason I am thinking of UFH upstairs is because I wanted to add some acoustic boarding on the floor and one supplier is able to do that with a 2-1 ufh/acoustic board product, but seems costly at nearly 2k (34sqm, 150mm centres). This is the same cost as my ground floor UFH quotes which is 135sqm! So probably a better solution to get separate acoustic boards and then fit rads. So I presume I would connect the rads direct to the boiler feed rather than the UFH manifold that would be heating the downstairs pipework? Comments/suggestions welcome! OB