Andehh

She is semi elderly, health issues and on her own so easy pickings for the bastards. Sadly we're a few hours away and I never knew, had kept an open offer to have a look at her UFH system which also seems to have been done wrong (thermostats wired to the wrong zones by the sounds of it) but never knew about the insulation until the mother in law told us about how pleased she was with it..... I could only chew my own tongue over how no one else found it odd that £6k for a days work should fail anyones laugh out loud test. (along with gov grant over the phone...) She has two mid 30s children who she could have asked for a second opinion!

Apparently lots of it, they took pics and showed her. She had actually been suffering from lung conditions, so the mould would be align to that. Property was cold beforehand (6 year new build,i repeat!) and apparently is noticable warmer after!

Sat with her family, and listen to her Mum talking about her sister and how she has finally got her 6 year old bungalow warmer. Transpires she accepted a cold call from a 'government advisor' telling her she was eligible for an insulation grant. They come and inspected, actually find huge amounts of black mould, wet joists and the felt damp and falling apart. But fortunately they can start the work within a few days. They quote to spray the back mould, strip out all the insulation and make good. They come out a few days later, spray all the mould disappear off, and return removing all the old insulation/damp insulation and replacing it. All in a days work for a few of them. Only cost her £6, with them securing a £2k grant from the government whilst they were in site quoting. I repeat, It's a 6 year old bungalow. Cowboys built the (expletive deleted)ing think, cowboys fix the (expletive deleted)ing thing. I still can't work out how she would have so much black mould, and wet / rotting timber up there though?! FOR (expletive deleted)S SAKE!

Yikes... I think we're 15deg and 3degrees? Does that make sense as a weather comp mode?

I imagine you'd lay this, then 9mm board or something over the top and carpet? If upstairs it'd probably work, but if you can get an extra 10 or 20mm you'd benefit. You will also need to run warmer temps to feel the benefit.

Just checked our Cop and it's 3.1 over the whole year. We do two cylinder heats a day to 51 degrees and in summer can smash 4 full tanks on a warm weekend day with filling paddling pools. Still only averaged out to be £160 a month,inclusive of daily washing machine and dishwasher usage. Couple of tumble drys a week,mostly WFH.

Plastic is the right approach, and insulting them as they pass through the wood is a great idea! Drove my mad in my first house when they didn't do this, and every morning it's wake me up as the heating came on. Really bugged me.

That's fair enough and this whole industry and self building in general can be a snake pit at the best of times! Just ensure they talk you through the flow temps, commissioning and weather compensation, and then ensure the insulation is all upgraded as well before winter!! Also to add, as part of our "whole new build" package and contracted price, our builder ear marked/paid around £14k for our 12kw Samsung incl fitting, 300l cylinder etc from joules, excl the £7500 discount, which at the time was only £5k expected.

Just to double check as we are soon to start this, is it 6 months from building control sign off as a general rule to stick to? Great info though, thank you.

Just building on the above, we had a warm flat roof, and large over hangs in a few areas, inclusive of a 30cm overhang all round. Builder used PIR for the 150mm up to wall insulation meeting it, then used Jablite (??) which was a white polystyrene type with lots of black dots throughout for the external elements. This sort of thing.... https://insulationgo.co.uk/75mm-eps70-expanded-polystyrene-insulation-board-jablite-of-4/

EPS type insulation? Cheapest rigid board type insulation?

As has been said, but worth repeating, insulating insulation insulation! How much depth have you got? If you can fit a 'good' amount of insulation, ie something at 100mm of PIR (or more to make it 'great, but I'm being realistic here based in it being a 35 year old house....) then have a 50 or 60mm screed with pipes in then that's the most efficient way of doing it. If you can't afford 150mm depth for the above, then I'd go with 80mm pir and then an overlay system on top with a self leveller as a compromised solution, but which would work. Quicker warm up and cool down times, and less efficient... But still workable.

Following with interest as I have the same in one spot!

That is very, that level of electrical capability is a skill I wish I knew more about. Alas life gets in the way.

Have to admit, I love my WiFi devices but the water softener is the last one I'd see the benefit of being wifi enabled. Once a month empty a bag of salt into it... Very easy to visually check it once a month... Regular usage etc... Not sure wifi offers anything my self!