Jimbobjones

Thank you @Gus Potter for all the considerations (matches my list, hopefully the only changes I will have is moving sockets and redoing all the doorways...). Perimeter insulation did not make my list so thanks for pointing out, I thought this was just for screed. Thanks @saveasteading for the cheap fill tip, I've checked with the local quarry website and they seem to have 7x different fill mixes so I'm sure one of these is the budget special. I'm reluctant to add a lot of stone build up due to my access; I could potentially go with a bulk tip but no doubt this would cause tutting in the village especially if we get more rain like last week. Alternatively lots of bags is just not worth the cost IMHO, would rather just fill it up with more insulation. I'm going to get some proper room measurements and stop working on the back of an envelope, then reassess all options

We think late 90s based on what old planning docs I can find I haven't done a calc yet for every room, but did a fag packet estimate for the biggest room as things are now: 150W/sqm and I currently have oil fired condensing boiler. I could also drop ceiling and add wall insulation to bring the heat loss down but I still think the radiators would be needed - given all that and the cost of UF plumbing and screeding I just don't think its worth it. The pain of retrofitting

Unfortunately the property already has a concrete floor that must have been poured as infill when it was converted, and the block internal walls were built up from this base. Therefore I don't think breathable floors like glasscrete/limecrete would be of any added benefit as the damage has already been done. If the subfloor was rammed earth then I'd certainly be looking at this opption for the reasons you stated. I'm also going to avoid UFH as it wouldn't be able to heat the space sufficiently, I'd still need lots of radiators. I'm hoping a floating floor and carpets would be 'good enough' compared to the current toe freezing situation

I live in a converted church and I'm planning to raise the ground floor level significantly as the windows are too high up. With a solid concrete floor, internal block walls, and 30" stone walls this is a great opportunity to add some insulation and make it less of an ice box. I want to add around 10-14" (TBC) over the whole ground floor living area 90sqm (hallway, 4 rooms, toilet, bathroom) I'm looking for some opinions on my proposed floor buildup: Level the existing concrete subfloor where needed (as level as I can make it) 1200 DPM lapped up to skirting height 100mm EPS100 (e.g Jabfloor100 £10 sqm) 100mm EPS100 100mm EPS100 (overlap all joints) Vapour barrier 22mm T&G P5 chipboard (glued joints, floating floor) Carpet in rooms / vinyl sheet roll in bathrooms Things I'm not sure about: Installing EPS: Foil tape all the joints? Does each layer freely float on the layer below? How should I cut the insulation around internal doorways; do I notch and run a continuous bond, or do I cut a break at the door threshold? Support areas: Where should I have a timber frame; Under the shower tray and toilet? Do I do anything different on corners to add strength? Services: Can I run anything in the insulation layer (between DPM<>vapour barrier)? Not water pipes or wires. Soil pipe? Shower waste? Building Control (Wales): When do I need to get them involved? Will gladly buy you a drink if you can help me out, Yaki da!