SimonD

K rend on its own will do nothing for either air tightness or thermal bridging. K rend have several EWI systems - EPS and Mineral wool probably your best bet. https://k.systems/ewi/ Airthightness needs to be considered as a separate layer to either IWI or EWI - usually plastering with some foams, tapes, and airtightness paint in certain areas you can't plaster.

You also have the differences in cold bridging and total u-value. It's more difficult to eliminate cold bridging with IWI and current best practise now suggests going no lower than 0.30 in IWI. With EWI you can eliminate cold bridges because you're wrapping the whole house - you can also include plinth insulation below dpc and floor level - and you can install as thick insulation as you wish. With your existing cavity wall, yes there's a risk of air movement in the cavity but if you've got suspended timber floors, you're likely to be retrofiting floor insulation? Then you can do some detailing to seal up the cavity as best you can around the under floor vents, for example. In addition you have the option of filling the cavity with eps beads. Ewi is also very good when the weather gets hot. Ours remained nice and cool throughout the heatwaves we had this summer. My vote would be always be EWI unless absolutely not possible.

Should've seen the state of the heat exchanger and spark electrodes I saw in a boiler I was fixing the other day that was still under a BG service/repair contract. Input was 8kW less than it should do and was 'serviced' only a few months ago. Customers got me in because BG couldn't come out for a long...long...time. Service my ar$e.

Isn't that more of a sign they haven't got a clue? 😉 IMHO You're much better off calling in the manufacturer as they often provide capped price repairs and will know a lot more about the boiler.

I agree with @Jilly - live with it for a while and see how you go. Work collaboratively and remember that a develoment is always going to require some compromise and outcomes you perhaps didn't dream of. Our driveway happens to be a smidgen steeper than 1:5 where my wife parks her car, the rest of it slopes but not as much. It's north facing out in countryside so more ice - this bit sometimes doesn't get to see sunshine as the house also shades the area. Never really had a problem other than when it has snowed, even during Beast from the East. I have a tub of salted grit and haven't touched it in years. Ours is tarmac mind you. I know a few people locally with steepers drives that do get used to it. I do wonder if you redid the drive with infill you'd end up with giref about the loss of view as it's going to be difficult to imagine what it'll look like and if it'll make the difference you want. And BTW my wife has a 4wd RAV4 automatic - parking is a cinch and never complained. More complains from me when carrying materials from all the deliveries not able to get up the drive!

Yes, but with the full fill, you then don't need the ventilation. The advantage with it is that the floor structure becomes a warm floor as the main part of the insulation is outside the structure - a bit like a warm roof. You then also reduce cold bridging. You'll probably need a VCL above the joists, below the subfloor deck . This is an approach that may need explaining to your BC officer who may ask for ventilation anyway, but it's a discussion to be had.

On that note, I'd suggest you find yourself another builder. If that's their attitude to underfloor insulation, I dread to think how they'd approach the installations and detailing of EWI and everything else. They seem to be ignorant of fabric first thermal envelope. Building Regs might also want to differ due to the extent of renovation and there then being a requirement to upgrade the thermal performance of the floor. Your other option not mentioned so far is to full fill the underfloor void with eps beads, depending on how deep it is of course. Having just completed a 1920s bungalow floor retrofit, that would definitely be my preferred approach now.

Microcement. You can then also have integrated splashbacks and all jointless.

What are the bets that there are going to be some rather large unforeseen and unintended consequences as a result of the rapid knocking up of the rescue package?

The energy ratings of boilers isn't entirely straighforwards as the total ErP score depends on the boiler, the installed controls and how they're configured. Typically a boiler on its own will only be about 89% efficient but controls are then graded in terms of Erp classes which add to the boiler efficiency. Class 1 is on/off thermostat which adds only 1% to the boiler efficiency. A class VIII control (fully modulating and zoned) will add 5%.

What boiler make and model have you got? It's worth checking if it can be configured for priority domestic hot water. Some system boilers can't and are dependent on the same setting for both CH and DHW. And some boilers that can be configured that way don't tell you they can be so you have to figure it out. I can tell you that Ideal boilers can and it's very simple, giving 80 deg DHW and modulating CH even though the installation manual doesn't tell you this explicitly.

LOL! Oh, I don't know, I found his book Bullshit Jobs highly entertaining. I think he really did encapsulate a lot of office working life in particular in that book. One story which was both very sad while utterly hilarious was the one where a colleague had been sat dead in his office chair at work and nobody noticed. I also rather enjoy his final book The Dawn of Everything. RIP a colourful deep thinker who definitely knew how to shake up the conversation!

I reckon you're right. I remember back in 2008 an economist who was also chief economist for the firm I was working for was on TV saying that contrary to the politicians and mainstream economists mutterings we were going to enter into a very long spell of low interests rates, possibly negative. He said mid to late 2010s at the very least and to expect longer. I think this one is going to be worse and finally I've heard on the media there are others realising this may be the case too. On a brighter note, there's nothing like a good crisis to focus the minds of folk and it's usually a crisis that forces change, it's just a question of what kind of change emerges from the ashes.

https://www.ft.com/content/73212b74-c1ba-11e4-8b74-00144feab7de 😁

Yeah, I think this reflects probably the biggest problem we face, which is that it's a political and social problem being tackled as if it were a technical one. We've had the technology for a while now..... we all must really know the missing piece.

I would take the radical position 😄. We need some serious structural reform to deal with the current situations. The energy market is dysfunctional and I'd also say that the way that capitalism has morphed is more like cancer than a benefit to the world and society at large. Central to this is the problem of economics which has, for whatever reason, taken centre stage in pretty much every single human activity and is now treated as if it were some immutable natural force. In the words of Keynes himself we should not 'overestimate the importance of the economic problem, or sacrifice to its supposed necessities other matters of greater and more permanent significance.' But yeah, if there wasn't such huge waste during Covid, there'd be a bit more cash to splash on renewables and all the other things. 😊

If you take into consideration the entire infrastructure together with all the structural reforms required to make the Net Zero shift, I'd reckon the total bill is way beyond private investors. They will and are cherry picking the bits most lucrative. The reality is that private investors don't like early stage risky high capital bets. But instead of me jabbering on, it's probably better to quote from a pieve by Aviva Investors for COP26: This outlines that in order to make the technology being relied upon to even get close to Net Zero, a lot of very expensive technology needs to be developed, tested and then scaled in order to make it attractive to the investors to take it forwards. This pattern is fairly well backed up by history. I'm not trying to be a naysayer, but there's a good number of proposals coming out about how it's going to be achieved, including by governments, that are frankly pretty naive.

The International Energy Agency Net Zero Report: Commitments made to date fall far short of what is required by that pathway. The number of countries that have pledged to achieve net-zero emissions has grown rapidly over the last year and now covers around 70% of global emissions of CO2. This is a huge step forward. However, most pledges are not yet underpinned by near-term policies and measures. Moreover, even if successfully fulfilled, the pledges to date would still leave around 22 billion tonnes of CO2 emissions worldwide in 2050. Investment will have to triple by 2030 at least.In the end I suspect it's going to be governments that shoulder the burden, not private investment, even though they're likely to reap the rewards unless the governments take proper equity stakes like some sensible ones do.

But it won't. RE investment is already too low to transition in time for 2050 and all that would be accomplished by supporting suppliers but paying the generators and extractors etc. is further transfer of wealth as it will result in bigger bonuses, happy hedge fund managers, increased dividends and more. It would merely amount to further FF subsidies over and above the existing ones. (Although Uniper in Germany has suffered over $12bn in losses and has been bailed out by the German government) Capping prices and dislocating gas from electricity prices is a good start but there has to be a re-configuration of the whole energy market as it's dysfunctional.

I'd love to know... the sales blurb says they cooking everything amazingly apparently. I bet it'll be like the rest of the kitchen toys we've bought or been given; the slow cooker, multi-cooker, sandwich toaster, 3 food processors, normal microwave, combination microwave, halogen oven, rice cooker...... I suppose it's one way of keeping the economy afloat.

And there's even talk amonst conservative members that they want him back after comparing the alternatives. 🙄 He'll be talking about airfryers next

Installed volume is the static volume of the whole installation including the meter. Domestic is max pipe diameter of 35mm and max volume of 0.035m3 above this the gas engineer needs to be Commercial. If your buried pipe is PE then assuming a 32mm diameter pipe you would ideally be looking at 28mm copper as 22mm copper brings the installation close to max permissible pressure loss even without many fittings or bends. In my calc I assumed 4 elbows and a single exiting Tee for the PE but none for the copper at 22mm and this came in at 0.93mbar. With 28mm copper (no fittings) the calc was 0.66mbar which gives room for a few fittings in the copper pipework. Looking at your photos I can see that you've got a 6m3/h meter which looks like u6/g4 type so approximate installed volume of gas is 0.22m3 based on the pipe lengths you've given me, assuming 32mm PE and 28mm copper. On this basis and assumptions it looks like you should be fine for supplying both boilers with sufficient gas. I only have PE SDR11 32mm figures to hand, not anything for 40mm which you'd need to check with whoever installed the buried pipe if you can. I think 40mm PE pipework could tip the installation into needing a commercial gas safe engineer to do the installation and commissioning of your new boiler.

Your typical domestic meter and regulator will be able to supply up to 6m3/h which is equal to a gross heat input of about 64kW so no problem dealing with your 54kW demand which would be about 60kW gross. You can check the rating of your meter easily on the data badge or looking it up to confirm this. The only thing then required is to do a proper pipe sizing calc so that you don't have more than a 1mbar drop from meter to any appliance when all running at max rate. Your heating engineer should be able to do this in his sleep. The one issue I can foresee is if he's only certified for domestic work and the total installed volume of gas takes him into commercial territory so largely depends on the pipe length and required diameter from your meter to the new boiler. What's the proposed pipe length to your new boiler? You're going to struggle getting a combi that will modulate down to as little as 2kW on the heating side. Most system and heat only boilers struggle with that.

I wonder whether there is more to add to this list. I'd include an explanation to politicians that they could actually get together and engage in a global collaborative approach to pricing and payment. But alas it's currently each to their own. Then again, our government couldn't possibly engage in collaboration as they'd fear it was just another attack on their imagined sovereignty. All that will happen if they cover the gas prices is the world's greatest state value extraction which does nothing to address the fundamental energy system flaws, rather perpetuates them and will leave the majority much the worse off. All the current discussion is at the wrong level which won't solve a thing.

Good question. It retrofit circles airtightness is claimed to be the first low cost biggest bang for buck improvement followed by insulation. On new build, BRE suggests airtightness accounts for about 10% heat loss. I've seen other figures suggesting 15-20%. Energy Saving trust puts a figure of 30% losses down to thermal bridging. However, countries like Sweden put airthightness at the top of the list in terms of importance for energy efficiency - it's first design for airtightness then insulate. I don't think the overall heat loss is 'just' down to the heat capacity of the air but how that movement of air impacts thermal loss of all elements - we know how much eliminating convective currents within insulation layers improves energy efficiency for example. Like with everything, it's got to be a balance of what is done to what extent and for what cost?