Iceverge

More pics please. Before during and after. Do you have any list of works the builders undertook? Like @Redbeard says it could be a recipe for condensation and rot if not done correctly.

You've had a new extension done with 100 mm joists? This is unusual. They must be very closely spaced and regularly supported by sleeper walls ? In any case 130mm of PIR between the timbers alone wont meet a U value of 0.18. It would be closer to 0.3 by the time you take the bridging effect of the joists into account. Do you have space above the floor to put more insulation there below your finished floor height? Pics of the build as it stands would be useful.

Or you could save some money and just insulate the floor with gold leaf. What U value do you need? PIR between timbers isn't a good idea in my book this detail from ecological building systems is much more robust.

It will turn a normal dense concrete block into a lightweight too. You'd save a fortune and your back.

Send them back up to fix it. https://youtu.be/b_ZeJqNt4Hk?si=CsfA58HZh5gIzlYe

Find the most idiotic person you know. Bring them to your house, get them good and drunk and let them loose. If they fail to operate any part of the house then it's too complex.

Ground works. Dig hole, pour in concrete. Done, dusted , finito. Now let's talk about this digger.......

You're right. I saw a number (5MW) and gone with that . That is rather larger than the average on futher digging. 1000 is a better number than the one I picked.

What do the economics look like? Farming is absolutely marginal even without the inefficiencies of a operating around a field of solar panels. Subsidies form a large part of farm incomes. Would these remain if there was solar panels ? Also farmers hate them, partially because we're ( I'm a part timer) stupid and hate change, partially because they make us redundant and partially because we don't like our neighbour we see in the he field next door and at the market being replaced by panels. I'm guessing solar on a large scale is a subsidy game too, (ignoring the long term climate thing) . Oil is only $70/barrel at the moment.

About 4 times as large as Electric Mountain in Wales. It could store the energy of about 300 normal wind turbines running flat out for 24hrs. It could power London for about 8hrs.

Agreed too many NIMBYs. There's lots of people who are healthy, have access to information, are in no immediate personal need of economic development and have lots of time on their hands. (People who need a house or a job don't complain, when people used to work until 65 and die at 70 it didn't happen). Farming can take place with PV but it's limited as the crops are effectively solar powered themselves. Grazing sheep at very low stocking levels is possible for example. I think locating PV on the south slope of the hills that have turbines would be an appropriate use of grid infrastructure. Of course it's beneficial to have it near the population. I think intermittent targeted power rationing for those who complain the most would be appropriate.

Outside picture too please.

No need to do this is have thought. Just build the walls say 1-2 courses above the first floor height, partially chase them for your services. Paint on airtight paint , fix ledger, fit first floor. Carry on as normal. Thinking about it, drilling concrete, cleaning the hols and inserting resin fixings is a ball ache. Would it be easier to build in m10x180mm bolts to a mortar bed with 50mm washers in the cavity side. And leave 80mm protruding inside Drill 20mm holes in the ledger for some shuffle room and bolt in place.

Pics of this plastic collar please. I'm guessing it's a screw in bushing reducer to take the thread down to an appropriate size. You may be able to screw it out and replace it. If you want to have a go as is by all means a do but be careful with applying hemp liberally to the thread as it may crack the plastic. The T&P valve provides a safety blow off in the situation the tank overheats or over pressurises. You can clean the brass threads relatively aggressively with a wire brush. By the way I'm not a plumber so beware internet stranger advice!!!

Yup, airtight paint would give you the option of bringing the airtight layer up and well clear of the floor construction to meet the wet plaster later on. Airtight sealant would work but you might find it tricky to plaster right to the line of the sealant. Dilute the airtight paint 5:1 with water as a primer before applying the top layer . You could always use airtight paint entirely behind the ledger before you attached it to the wall. Don't forget to put some mastic or sealant in the holes the bolts go into the wall too and to airtight paint the chase behind the ledger.