pilgrim

Ah ok, thanks for the heads up!

Yes this is what I had thought, EPS to build up the bulk then PIR on top of that and then the UFH pipes. I had also been looking at the egg crate style boards to lay it on, one of my friends recommended that for ease of fitting over the staples. Ive not fitted any UFH before so open to other opinions!

Can anyone offer me some advice on the best way to build up my floor level for UFH installation? I have removed the old suspended timber floor on the ground floor level as it was rotten, I now have a void of 330mm to fill to make up the floor level. The house has a concrete base level which runs all the way through already. I had planned to use some hardcore then soft sand, Damp proof membrane then insulation and UFH screed. but the building inspector did not like this plan and said he wanted me to pour more concrete in before adding insulation. So now I am thinking off levelling off the existing concrete damp proof course, then adding 260mm of insulation, then finish off with 70mm of screed and UFH pipes. Does this make sense? or can anyone suggest a better method? Thanks

Thank you for your help. I had not realised that I would have to deal with building control so I will contact them. I have just done a quick and dirty sketch of what I was talking about if that helps make things a bit clearer. There is also a room in the roof conversion, which has approx 100mm fibreglass insulation all around it. I am also planning on replacing this. @joth Does this help at all? @AliG I have plenty of height on the ceilings so I will add the extra 50mm below the rafters. Between the walls and first floor ceiling I was only really hoping to deaden the sound transfer not too worried about heat transfer between the rooms upstairs. And yes I totally agree there are a lot of things that seem like extra hassle that I hadnt considered doing before I started but as you say it makes complete sense to do these other jobs now while I have a blank canvas, this will be my house im not just flipping it so I want to everything right and to the best standard that I can. Do it once, do it right as they say!

I think that you can do the work DIY and still claim the VAT back as long as the finished house is your, or your families home. This is what it says on the 431C form. But you do have to make sure that none of the trades that you use also try and claim the 0%.

I've tried reading through a few of the topics here and making sense of what other people have done with insulation. In my build I have 100mm rafters between the ceiling plaster board and the felt layer of the roof. (the ceilings cut through the top corners of the upstairs rooms. I have 100mm studs between each room and 170mm between the floor and the ceiling of the ground floor. So I was thinking of putting 75mm PIR board insulation between the rafters leaving the 25mm gap between the board and the felt for airflow to stop condensation. (I think I have understood the warm and cold roof correctly) adding 100mm of knauf acoustic roll mineral wool insulation between the internal walls and floor gap. I was recommended to use the PIR board insulation by someone as it has a better U value, but I have seen a lot of comments here arguing against using it. so any advise for or against it in my situation would be appreciated. Thanks

Yes, someone did tell me this, I understood that you just need to keep all receipts and then submit a claim once finished, is that correct?

Hello everyone, Ive only just found this forum but what from I have read over the last few days it seems like a good place to be! I am a few months into a full gut and refurbishment of an old council house 2 up 2 down semi detached, bit hard to find out the date of construction but I think it was 1930s. The house had been abandoned since 1998 so needs a lot doing to it. At the moment the house has no central heating system and the wooden suspended floors on the ground floor have rotten away. So basically a new build just with the old external walls still standing! I have stripped out all the old stuff in the house and now have bare walls downstairs and just the old stud work timber from the old internal walls left upstairs! So I am ready to start ordering the plasterboard and insulation! Im doing most of the building and planning work myself so looking for as many practical tips and suggestions as possible, need to keep the costs down as much as I can! I am planning on installing an air source heat pump (no mains as here), wet underfloor heating downstairs and lots of insulation and new double glazing. Then if all goes well I may put an extension on the back in the future!