Seadog

Indeed it seems to change with every manufacturer ! For the avoidance of doubt; https://www.superglass.co.uk/products/superwall-32-cavity-wall-batt/

I have just built with a full fill 150mm cavity, used 0.32wmk Supawool. I found the cheapest place for 275mm Type 2 stainless steel cavity wall ties was Metro Fixings, my local builders merchant was a lot dearer. I am in a relatively sheltered area so for me it was a no brainer given that its harder for Brickies to cockup wool than it is PIR board

Much appreciated. So in summary, a 250l UVC with single coil for DHW, immersion (twin ?) with a 100l buffer. 3 zone S plan with the UFH off the buffer instead of the main hot feed. Use a room thermostat to control the towel rads ? Thanks Jas

Thank you Peter, UFH is 103m2 downstairs and 54m2 upstairs, total 146litres and 11kw to heat. Yes I have room for a larger UVC. Jas

Thank you we have 1 main bathroom, 2 en-suite, giving a total of 2 baths and 3 showers. 4 of us in total but we tend to all get showered etc at different times. Jas

Morning Peter, I have mains gas on site. I have looked at ASHP but in the end have decided to go gas. thanks Jas

So I am at the stage where I need to really sort out the house heating design. I have UFH upstairs and downstairs on separate manifolds, 3 towel rads and I can also make use of a PV array on the roof. I have been pulling in various quotes for Thermal stores. I had it in my head to use a simple S plan system but one of the suppliers has recommended a twin coil thermal store with DHW/UFH. Any thoughts from those in the know would be very much appreciated. thanks Jas

I used ITS technologies and got 12 320kw panels with a GSE In roof kit and a Sofar 3.6kw hybrid inverter in case I want to add batteries in the future. Total came to £2700 + vat but I will reclaim the VAT as its for a self build. It will be my forever home so for me it was a no brainer. If I find I am using all the energy I generate, I won't bother with the batteries.

Thank you for the replies. Block and beam floor with 150mm PIR under 65mm screed. 150mm cavity with full fill wool, thermalite walls. 150mm PIR between rafters with 40mm PIR overboard and 400mm between/cross joists. I envisage a uniform heat so am steering towards 1 upstairs and 1 downstairs.

Evening, I have my new build water tight and moving along nicely, 1.5 Bungalow. I have opted for wet UFH downstairs laid in screed, 110m2 and wet UFH upstairs laid within EPS board with a 5mm flexible screed over the top for carpet/laminate 60m2. A friend who built a similar sized property wish that they had put UFH upstairs so I was steered by that. I have had several quotes but they have all put a stat in every single room. I am thinking that is not necessary and one upstairs and one downstairs should be sufficient. However I have read that much conflicting information with regard to heating/plumbing etc that I now can't see the wood for the trees ! Any thoughts ? Thank you Jas