jack

Random attempts to access shared resources is common across a wide range of communications protocols. It's used across all the major mobile standards in the form of a RACH channel.

Some mini-diggers have retractable tracks that let them get through doorways as narrow as ~700 mm. One of our neighbours had new fences put in about 5 years ago and two of them have already failed at the base. This is in a very damp area that gets no sun. I see similar all the time around me. I wish I'd known when getting the fences done how long ordinary treated posts tend to last. Our fences are 10 years old and no obvious issues yet (we're much higher up than the neighbour and on sandy ground), but looking at all the failing (and not that old) fences in my area, I know it's only a matter of time. As for longevity, perhaps not ideal for OP if they plan to sink a load of vertical posts, but for fenceposts in general, postsaver sleeves have a good reputation.

Welcome to BuildHub.

Full details in this BuildHub thread. Thanks Jack

And by quite a lot in some cases. https://www.reddit.com/r/OctopusEnergy/comments/1rwgpp5/wtf_octopus_just_slashed_iog/ Just in time for the sunny weather when my solar produces more than I can use!

Hearing this would make me very keen to consider them if I were building again, even without the door and window installation nightmare we had with another supplier. A supplier who's willing to take this sort of responsibility is a rare and beautiful thing.

It's worth having a look at installation specs and limitations. Higher spec cables tend to be thicker, stiffer, and have larger minimum bend radiuses. Cat 6a can be more challenging to route and terminate than cat 6, for example. I also think cat 6a needs different terminations compared to cat 5e/6 due to having thicker conductors.

It's possible I suppose. Of course, all of this assumes Iran agrees to back down, or is incapacitated, and I don't see either of those happening in the short term. Insurance or not, would you agree to take a ship through the state of Hormuz when the Iranians have been laying mines and are threatening to blow up shipping?

I think insurance policies are already on hold for transits through the Straight of Hormuz. I personally think the situation is too far gone. I was reading earlier how long it takes to get insurance policies back up and running properly after they've been suspended like this. Trump could declare "victory" tomorrow, but it could take weeks if not months before shipping insurance is back to normal. By then, the world's economy will have been crippled. Trump and Co. really thought this would be a slightly bigger version of Venezuala - couple of weeks instead of a couple of days. Instead, they've probably brought forward the next big recession and money print by months if not a year or more. Probably the last thing they were hoping for given the mid-terms later this year (although another argument is that they know they're going to lose those, so they want to get as much of their agenda implemented as quickly as possible before then). Sow the wind, reap the whirlwind.

Copper grease is your friend with stainless-on-stainless. I learned this after I managed to completely seize one of the stainless nuts that holds my ASHP stand down, halfway onto the threaded bar. Apparently galling is a thing.

Be gentle. Toughened glass is already under a lot of tension, and etched toughened glass has an increased chance of shattering. I'd personally be tempted to start with some sort of windscreen treatment like Rain X and see whether that reduces the appearance of etching. If it works, you'd need to re-apply it every few months, but you'd need to clean it far less often, as water won't stick to it. If that doesn't work you can always move on to something more aggressive.

The PassivHaus Institute thinks otherwise. Sure, their heat demand/load numbers are based on the theoretical ability of an MVHR system to deliver the required heat based on several other assumptions, but imo that context is of little practical relevance given they don't actually require heat to be distributed in that fashion. But UFH isn't "sometimes" installed for "reassurance" in the UK. UFH is widely installed as the primary heating distribution system in PassivHaus-class buildings in the UK, presumably because people prefer to heat their homes that way than via hot air through a ventilation system.

In thermal efficiency terms, the PassivHaus standard is more about reducing power consumpton to a particular level than to removing the need for a heating source. Very few PassivHaus-class builds in the UK would be comfortable to live in year round without any form of heating.

It's a bit like childbirth (I imagine). In the immediate aftermath you can't imagine wanting to do it again, but the memory of the pain fades and you find yourself thinking about it. I'd love to build again, but I couldn't manage it while having a day job. We might sell up when we retire and put the money towards a smaller new build somewhere a bit cheaper.

We self-installed a 5 kW Panasonic Aquarea in 2015. Our electrician did the wiring (very simple) and the plumber took care of the plumbing from where it entered the house. We probably paid £400 all up for the installation, maybe less. I did the pipework from the plant room, through the underslab insulation, and plumbed it into the unit. As to why we went with a heat pump: Despite there being gas on the road and the bungalow we were replacing being built in the 1950s, there was no gas to the property. It would have cost us time, money, and disruption to install gas. We wanted to avoid paying two lots of standing charges. We'd used an induction hob at a friend's place and wanted one of those instead of a gas cooker. We were going for PassivHaus class insulation and airtightness, so we knew that we wouldn't need a massive heat source to heat it. The idea of a low-and-slow option seemed more compatible with the house's thermal characteristics. We wanted the option of cooling. Having lived with it for about 8 years (we didn't enable it for the first couple of years), this is probably one of the best reasons to choose ASHP in a well-insulated house with UFH, imo. We (well, I!) wanted some sort of home automation, and I felt that an ASHP offered more interesting control options than a boiler. We haven't actually integrated the ASHP in the way I'd thought we might (the modbus module for the ASHP was too expensive to justify), so this point was somewhat moot in the end. We installed a lot of solar (8.5 kWp) and I thought we'd be able to at least partly power the ASHP with excess solar. With the benefit of hindsight, I'm not sure this was a great argument. I'm genuinely unsure how often we generate excess energy at a time when the house needs heating. In the shoulder months we often don't need heat, and in winter when heat's required, we often generate very little solar, let alone excess solar. I don't remember whether I considered E7, E10, or any other time of use tariffs at the time we made the decision to go with an ASHP, but cheap overnight rates have since become of the strongest reasons for using an ASHP imo. For example, I have our system set to prioritise heating during the 6 hour cheap window with have with Intelligent Octopus Go. I allow a little bit of overheating during that period, and allow things to cool down a little more during the expensive period before turning on the heating. There are sometimes periods of several days where the heating is only on during the cheap period, which is quite satisfying to see given it's about a quarter of the price than the peak rate. The main concern I had was DHW recharge time. That hasn't turned out to be a massive issue, except when our younger one - Mr three-hour-shower-of-power - is home for the holidays. Upon reflection, I'd have gone for a larger tank than the 250 L one we installed. That would have allowed me to lower the DHW temp even further, while ensuring ample hot water. I don't know how repairable boilers are, but I get the sense that ASHPs could have a very long life, at least while parts are still available for any given model. How repairable any particular issue is depends on the failure mode. About three years after we installed the unit, either the control board or the pump failed. Apparently both are replaced at the same time, because it isn't possible to tell why one or the other failed, and one of them failing can bring the other one down with it. Sounded like bollocks to me, but I did a bit of research at the time and this seemed to be a common view. I don't recall what that cost us, because it was tied up with some other work, but certainly it was several hundred quid. I think the pump alone might have been £400, which sounded like an utter rort for a smallish pump, but I wasn't able to find a cheaper equivalent. It's since continued running without issue for a further 7 years. If something catastrophic happened and the whole unit needed replacing, I'd just go and buy a new one for £2-3k and install it myself, reusing the existing wiring and plumbing. The units themselves aren't that expensive, even for decent brands. For example, the current equivalent of the model we installed is about £2700.

For those using SketchUp, here's a potential alternative way of working out heatloss, based on SAP principles: https://forum.buildhub.org.uk/topic/46635-preliminary-sap-and-heat-loss-tool-for-sketchup/

The architect who designed my house has just released an extension for Sketchup. As I understand it, you build a very simple model in SketchUp, select various values from drop-down lists, and it outputs a draft SAP report. You can use it for heatloss modelling, or to estimate what impact changing components etc. will have on SAP score. It's really designed for architects and designers, but there's a 14 day trial if you want to take it for a spin and see what it can do.

I agree with this, but was just commenting on the MVHR balancing point (and not suggesting the MVHR is the solution here). @Potatoman, for a short term fix while you figure out what's happening and what to do about it, consider getting a dehumidifier. They can make a world of difference and aren't expensive to run (pennies per hour). If you consider this option, look at Meaco. They're a British company who make very good quality units for not crazy prices. Three year warranty as standard and I've heard of them helping people beyond that time too.

One of my kids lives in Amsterdam. The roads near where he lives are being redone. It's taken a year but you can really see the quality of the work.

The system should definitely be balanced by system design, but some units (including all Brink ones, I believe) auto balance by adjusting relative fan speeds. I seem to recall that some actually allow you to set a slight bias one way or the other, to slightly pressurise or depressurise the house.

Also, some want to stay under the VAT threshold and so will ask their customers to buy materials.

I meant to mention this. A lot of suppliers won't separate out their costs in an estimate. I think a lot of people would be very upset to see how much of their money goes on materials in something like a heat pump installation by a typical heat pump installer. Also, for a lot of trades, this would be an onerous proposition. Imagine the effort that would be required for an electrician or plumber to provide an accurate estimate or invoice including exactly how many metres of cable/pipe, switches, valves, backboxes, couplings, etc., etc., etc. It just isn't feasible to quote or invoice at that level. We tried this a couple of times. Some suppliers would only give trade discounts to tradespeople. From their perspective, if they put the invoice in the name of the self-builder, it becomes a consumer transaction with all the force of consumer law behind it. Many suppliers don't want that risk and would rather keep it business-to-business.

This winter's been bad for tarmac health. It feels like it's barely stopped raining since the first week of January, and I've really noticed the potholes in the last couple of weeks. I saw something the other day from one of the larger county councils (I think) saying that their entire annual budget for potholes would, if they could spend it all at once, fix less than 10% of current reported potholes. There's a massive crater near my inlaws that's had a traffic cone in it for weeks. There are bigger potholes on bigger roads that will need to be filled first so I can't see it being done in the foreseeable future.

To be clear, I don't begrudge anyone marking up a product up if they're sourcing, picking up, etc. Whether something is overcharging is very much a matter of degree. I guess if you can see the price you can get something for (taking into account eventual VAT reclaim), you have a good basis for understanding whether what a tradesperson is proposing to charge seems reasonable in the circumstances.

I don't think there's an easy answer. Trades often just buy at the last minute and so will buy materials wherever is in stock and most convenient. We had a few cases where we were paying for materials and were told that something was needed within the hour - not a great option when the best deals are online. Same when trades were buying on our behalf. They'd often just ring the first place they thought of, happily paying more because it wasn't their money they were spending. In some cases, trade discounts are so high that it's cheaper to just pay the VAT. I specifically remember that our tiler was able to get tile trims for half the price we could find them anywhere. I think in that case we actually submitted his invoice from the supplier with our VAT reclaim and explained that it was accidentally in the name of the tradesperson. It was accepted. In fact, we had one invoice where we bought in person, and the invoice had a completely random company's name on it. I assume the supplier just used the last name on the system or something. Either way, we explained the situation when reclaiming VAT and it worked. I think the only way to get ahead of it is to speak with every trade up front and find out what they're willing to offer. It sounds good using their trade discount, but they might expect to mark up their purchases given they need to cover warranty issues. If you're buying, you also need to be on top of the trades at every turn, to find out what they need and when. You'll overpay every nearly time if you wait until they ask you for something. I bought from all over the place and never asked for a VAT receipt. Receipts from places like B&Q generally show VAT, so nothing else is required. In fact, we had a few receipts that didn't show VAT and I just calculateed what we would have paid and noted it in the covering letter when reclaiming VAT. Everything was paid out without question.