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“One day, Canada will take over the world. Then you’ll all be sorry.”

Yes, those are key areas to focus on. It's a really interesting topic if you have the temperament for it; plenty of scope if you want to turn it into a PhD, or to do some DIY humidity monitoring on your eventual solution. FWIW the most extreme experiment I've come across so far is the French Réhafutur 1 project in Pecquencourt - but solid walls again, no filled cavity. They used eye-popping thicknesses of internal wall insulation, with 'intelligent' VCLs (not for the hempcrete) + very good airtightness + MVHR. Of course the documentation is virtually all in French, but I posted a bit about it a couple of years ago in this thread mainly in relation to hempcrete. The images in the linked video give some idea. Disappointingly, a long-term report doesn't seem to have been published (one day I'll get round to asking), but after year 1 it was looking positive (with higher than desirable moisture in the north-facing elevation thought to be due to moisture from the build still drying out). Tip: don't take things this far. Keep us posted.

World oil production gas never been higher. But uk oil (and gas) peaked around 2000 at about 4x today's rate Note the other big Nsea producer Norway, is also declining albeit slower This is from the industry body last year. UK authorities are significantly underestimating the country's still-recoverable oil and gas reserves due to policies on tax and the environment that mitigate against maximizing resource recovery, industry group Offshore Energies UK said June 23. The group based the assertion on an independent report from consultancy Westwood Global Energy Group, which found remaining recoverable oil and gas reserves could be up to 7.5 billion barrels of oil equivalent, compared with a government estimate of 3.75 billion boe published in February 2025. Note they are pushing the maximum remaining ('recoverable') as 7.5billion boe. Other sources put the maximum at 6bn. This includes stuff we know about and stuff we think we might find. As previously noted the UK uses around 1.4million barrels a day. So 7.5bn divided by 1.4 million is near enough 15 years *absolute maximum* There are cars being bought today that would burn the last drop of British oil in that scenario. And, again, that is the absolute maximum. To quote from the same report There is no escaping the fact that the UK North Sea is a mature basin which is in production decline. While the decline ultimately cannot be prevented, there is still a substantial prize available to companies and the government, if the investment environment allows it. Here's an accompanying illustration. Note the "7.5bn" figure is 'no constraints' and half of that is made up of discoveries and prospects - basically "maybe we come up with a way to get even more oil than we thought" and "maybe we find some more oil" If we take the high case, which still has a lot of finger crossing, it's just over 4bn which is less than 10years. So,whilst there may be more oil and gas about, there isn't going to be much we can get ourselves. We'll have to get it from the big oil producers who are.... 1. USA 2. Saudi Arabia 3. Russia 4. Canada 5. Iran How many countries in that list can we call friendly? Again, the idea that the UK can be energy independent by extracting more oil whilst carrying on as we are (oil based road transport, gas based heating and electricity generation) is a fantasy. We need to reduce our demand and increace our home grown energy - nuclear and renewables. https://www.westwoodenergy.com/news/westwood-insight/westwood-insight-ukcs-geological-potential-remains-but-sentiment-shift-is-needed

i dont know, but doubt it. all the plys in structural grades are high quality but can be ugly. Other ply tends to have pretty faces and cheaper inner cores. The marine ply should be strong enough but is surely better kept for an exposed purpose.

They always say that. There is no logic to it so I've no idea where the nonsense originates. is tis indoors and under cover (not getting rained on?) how long has it been down? Unless the contactor added water, which is against the rules and the supplier would have made them sign on the ticket, there is very little free water in the slab after the chemistry. 30mm is a lot. was it by a specialist? get them to fill it in. wat is the finissh at present and was it intended to be the end result? We have 30mm in the barn, as it was agricultural quality. The sole plates are packed to level. the remaining variations become less severe once the walls are in, and we are putting an extra 25mm insulation in just one area to reduce the screed depth there. are you intending the concrete as the finish or affixing finishes to that? Any dampness on the bottom doesn't matter. the top may i suppose, if the screed is not compatible with damp surfaces. it's likely you can screed any time now but please supply the info as above.

Had a look at mine, and pump doesn't shutdown, it may slow down but doesn't stop. As the paddle moves it doesn't cut flow off, flow basically transitions from one port to the other, with both ports open until the DHW port closed. Assuming the UFH manifold is fully open it shouldn't see an issue. Do you have the piping all clamped up as it should be? No air in the system? If it's water hammer, the pressure wave need something to hit, and bounce back. A photo of the valve and the piping to UFH may help. Assume you don't get any fault codes?

So why isn't the industry making this case? The figures were seen in this thread area from the industry, and are likely on the optimistic side.

I can do but its just earth to earth . red to live and black to neutral. May be a dud light.

Norrsken customer support has been excellent for us. Did you speak to them?

Interesting thought and entirely plausible. Here is the basic circuit I used from the install manual - except that the Underfloor Heating (UFH) is where the buffer tank is as we have no buffer tank. This circuit makes sense this way round although I guess you could put the valve in the return junction. The valve is normally open to the UFH and the Heat Pump sends a signal to the valve to change over when Hot Water heating is called for. So the flow comes up the middle of the valve and goes out either to the UFH circuit or the Tank circuit. Hence as the valve closes, on the spring, to the tank circuit it will have the flow helping it close. If that is the cause of the thump then it's a control problem. Perhaps the Heat Pumps circulating pump should be shut down while the valve changes over although that would be a firmware issue in the controller?

I would look how this is reflected in room layout, some rooms may only need straightening out with self levelling compound, others may need way more, it also depends on the area of the floor how much needs to be corrected. We did all the correction that was needed a short time before floor covering went on.

@ProDave thanks Dave,I’ll take a picture tomorrow when I get home from work. Regards James

Post a picture of your connections at the light fitting, that should clear this up.

To keep hot water available switch the immersion on and leave it on. It may not heat the whole cylinder but should give you enough for a single shower. Wait half an hour between showers and you'll all get one. Borrow a couple if electric fan heaters and use those to heat the house while the heat pump is off. For the heat pump fault if youve already cleaned and replaced the blocked strainer and repressurised the system, switch the power off using the switch by the pump and leave it off for a couple of minutes. Switch the power back on and see how things are.

I have this problem too, curiously on better grade ply rather than the cheap stuff which seems fine.

You may need a differential bypass valve, across flow and return before the valve. Are you 100% sure that the flow and return are the correct way around, as the thump is often associated with the valve 'paddle' being slammed shut in the flow.

A switched live is only a switched live, if you keep flipping the switch. If you flip the switch on, and leave it on, it's then a permanent supply Live is live, comes from the same place, ends up in the same place.

I don't agree with that analysis. I'm not an expert, but I do have some experience in the oil and gas sector. UK oil and gas production and to an even greater extent, exploration, has pretty much been taxed and regulated out of existence in the past 15-20 years (maybe more than that, but before my time). You can't book more reserves if you don't drill the wells. And it just hasn't been happening for a long long time now. I still keep in touch with people in the industry and they tell me (perhaps overoptimistically?) that it's out there, there's just the wrong environment in place to go looking for it/extract it. We were all told when we were at school that oil would run out in 20 years, or we're now at or very close to peak oil production. Both predictions have proven to be way way wide of the mark.

That is very helpful to know, thanks. We have a 10,000L tank but it was the local rainfall data vs roof area calc that was equally, if not more, important in our having to prove 'sufficiency' of the supply. Was there any official assessment of the water supply, like to show roof area vs rainfall calculations for how much water you can ever collect in a year?

Its controlled by the heat pump and its the valve that came with the heat pump - this one I think: The ZVM28

How are you controlling the 3 port valve and pump - is all via the heat pump controller or something else? What valve are you using?

I've got 18mm birch ply and some marine the same thickness. This is stronger than structural ply no? I've also got some left over T&G OSB but not sure that is as good as the ply. I've got ring shank nails left over as well but was going to screw down so it can come up again in the future given the electrics running through.

Nothing tripped. Im trying to find out if switched live to neutral on the light is a thing or not.

Or in derived SI units, 6,154.49 MWh. I use about 25 MWh/year in my car.

Indeed, I wish that too. Yes, with the caveat that, as a precious resourcr, we shouldn't be going to the trouble of getting it out of the ground just to burn it to go a few miles down the road. Rather irrelevant, except to say it's odd how often views on the rigidity of gender go with views against "Net zero" given there should be zero correlation. But on China, they are indeed very hard nosed and yet these ultra pragmatists, in moved by any notions of "wokeness" are building out wind and solar at a frankly astonishing rate. They are electrifying industry at speed - nearly 1/4 of heavy trucks (not cars, not vans but freight trucks) sold in chain last year we electric. Remember this I'd supposed to be the hard to electrifying sector in a country not exactly known for being compact.