SteamyTea

Will do, when I know what my schedule is for Mothercare this weekend.

Seems most of the work is already in place. Just a case of trapping some warmth and shifting it about.

What is the roof and walls made from?

My Ex BiL lives there, about time I visited him after my sister took him for every penny. Now there is an idea. Get it all frothy and see how it performs.

It is close to what I did for my BSc, about time someone tried it out. I even had a cheap storage device. Can do, what is your nearest town? Not may leaves in winter.

So you got about 100m2 of almost south facing roof. When you get some time, find a sheet of something, insulation would be best. Get up in the eves and fit it 200mm below the inner roof. Seal all the edges, cut a hole at the top and the bottom for a small bathroom fan, wait till it is sunny, pump some air though and see what happens temperature wise. If you can capture 50W.m-2, that is 5 kW. Going to be up your way, again, again, come the weekend.

Right, let us get serious about this. Rough sketch of the place, with dimensions and roof angles. Compass orientation as well. Any chance of a wind turbine? https://windempowerment.org/the-piggott-turbine/

I recently looked into drilling a small hole in an existing posi joist and all the evidence suggests no form of drilling or notching is allowed. Have you checked this How do they cope with screwing down floorboards?

Who knows, I am a good Methodist.

Used to have a car sticker that said: "Keep Portland Weird" (and I know it is a US import)

Couple of times, after working on my similar system, I have had an airlock. Open tap and sucked on it like Stormy Daniels on Donald Trump. Soon worked again.

Ask @pocster

Not the cost of the machine, or the materials. https://m.alibaba.com/product/62219800864/polyurethane-spraying-machine-foam-making-machine.html

Still illegal down here. Sometimes I feel we are living in the dark ages.

I want one of those. I work with people that make a simple job difficult.

Who is doing the technical side?

No wonder the MVHR has broke.

Having lived in Weymouth, Portland has many more problems than just wind. Have refrained for mentioning the unmentionable.

Does not come across well on here sometimes. I was cooking lunch, so only half a brain.

That is because they are the Fire Brigade, not the EA.

Do you remember this. 3 plates of spagetti.

Chapter IV of the Industrial Emissions Directive You may get an excemption.

Not legal now.

But no better than electrical resistance heating, and more expensive to buy. The OP wants free heating.