SteamyTea

I don't think there is a lack of skill to install them, lack of incentive, on the part of the installers maybe i.e. uncertainty. Here are the ONS numbers, since 2010, for below 4 kWp systems. March this year was around 38.5 MW installed. If we say that the average installed capacity was 3 kW, that is 12,800 systems installed.

5.5% chance is neither.

Well that was good. There are ways around the damp issue, but for that knowledge my palm has to be crossed with many pieces of silver.

Interest rates in Russia have just gone up to 12%. Argentina's are 118%

Yes, and you get the added bonus of a better temperature in the loft.

Just knocked this up, it may help. Periphery Losses.xlsx

I did a bit about calculating periphery heat losses on here a while back. It is not a a BSI standard, but was close enough. Basically you add the aperture/wall thickness to the total wall area, then calculate as normal.

No, but I could if I wanted to. I don't even know where I got the tape from, seems to be one that just appeared one day. I have a posh Stanley one, and a calibrated engineers rule. It was calibrated in 1979, should still be good.

Are you thinking about cold bridges and how to calculate the losses?

See this bit at the end of the tape measure, bend it. Should get a 5mm variation then.

That will be 1096 days then.

I hated trigonometry, and is one of those things that is set up oddly in a spreadsheet as they use radians by default.

Well done. That is the secret, people forget that when modelling physical things, real models really help.

Also look at the peaks because which possibly (I don't know the software) takes night time into account. It is also worth adding in the reflectivity of the glazing, the steeper the angle, the more gets bounced off. I am not sure of the G-Value covers that. Solar film is another option to get you though the regs, cheap and removable.

My feeling as well. Just what is leaking, an edge or a flat, badly laminated, surface.

Tomorrow is fine, probably going up country anyway.

They are 375mm deep and claim a U Vale of 0.14, down to 0.11.

Thought you wanted something contemporary, not a pastiche of a 1920 cast iron radiator. For similar money you can get an A2AHP. Even more 'Ultra Efficient' than a 'ceramic core'. My 1980s storage heaters have ceramic cores, called bricks.

Well the Geo in house display lasted a total of a day. Spent two hours in phone to EDF (glossed the back door and moved storage heater will on hold). The remotely 'reset' my smart meter, made no difference. They also thought I was on pay as you go tariff. Then got cut off. Recalled, made sure I was not on PAYG. Took a while for them to check as there 'system' was slow today. Changed back to quarterly billing and variable tariff. (expletive deleted)ing imbeciles. I suspect my new in house display won't work.

Did you take pictures while it was being done? It was raining 3 weeks ago, it's been wet for 5 weeks now.

Which west coast you on, I like looking at GRP roofs. Pictures will have to do.

It is alright, not as good as a rabbit, as Bear said to Rabbit.

Would not have passed current fire regulations.

Quite often there will be a serial number somewhere, they often have a date in them.

Then you need a fair amount of insulation. The reason is that the floor is going to be at about 30⁰C to achieve a room temperature of around 20⁰C. The greater the temperature difference, the more insulation you will need so that the ground below the house does not sap all the energy away, leaving little to heat the house. Generally considered that a minimum of 150mm is needed, though the more the merrier. Easy enough to do the calculations. https://www.kingspan.com/kz/en/knowledge-articles/how-to-calculate-a-u-value/