 Right, future Steve just put this towards the beginning. There's a lot involved with this So we'll just brush over the the basic stuff and I'll put links in the description So you can deep dive into this and read more into it But I'm a lot of a lot of buildings better to help you to and obviously architects should be helping you If you've got an architect involved on your job So let's press on There you go makes a show it up now. Oh, yeah I know when you're ready and I'll start talking ready when you are far away. Okay, so it's so conservation of fuel and power part L Approved document L. Yeah, that's the orange bit Don't change your glasses. No, you sure in the work once so yeah, we're not okay. We're good. Yeah, I'm just look smarter I'm not going upstairs. Okay We try to say don't look don't look good in my video. I'll play your glasses. I went like and spy kids George Clooney's guys is removable Eye blacker George Clooney He was the president in spy kids and then there's at the end of the first movie George Clooney. Yeah You sure? Yeah He was the president and he was there with blacked-out eyes And he takes it off because it's like glasses, right? Anyway That's a minute doesn't mean you need to get rid of already That's true. Yeah Go action Welcome. This is a bit of a different video to our usual ones We're gonna go through a little rundown of the building regulations for our extension work, which It's official name is the conservation fuel and power approved document L Also, otherwise, no way everyone's just pile building makes but these are the regulations that we've had for the last year now And these are this is what we follow and we're doing extensions from slab up to Our finished product. It's what everyone has to follow. Yeah This this video is no is like we know experts We're giving you information that we've gained over the last 12 months doing Extensions and stuff Which we've just muddled our way through basic because the last 12 months building inspectors have been doing the same as us and learning What all the new regs are and what what works what doesn't and then we're just trying to pass on what we've found out to other people Just to make it easy for other people and it's just an easy video What we'll do is if we give any information during the video will drop links into description so you can just drop in there and go on to there and that's where There's loads of information there where we've got a lot of our information today. So a bit of a backstory. I started in Middle to late 80s and back then During my apprenticeship. We're building houses. So back then we were doing 50 mil cavities We were insulating our cavities full-filled fiberglass, but a lot of places still went insulating the cavities. In fact, we're still using Anglion lintels and Timberlintels and concrete lintels in the early 80s. So Over time building makes change and Especially last few years it's become really with the climate change and all this plover It's become more and more important to conserve energy, which means more insulation Which means new regs bigger cavities thicker insulation wider lintels So we're going to go through a few of those little things with you and just say what we use what we don't use what's available I'm just trying to help you if you're Just starting off to give you just the rough idea Because obviously if you're doing a job by building regulations the inspector will be checking all these things And at least if you know in advance Some of these details you can go forward them without having to worry about Anything being pulled up. So after the part I was introduced I think I've seen it back to 2021 but 2022 also But it gave like a grace period. So it's actually started being enforced properly in June 2023 and if your Extension was passed for planning before that then you were allowed to build it with the old hundred mil cavity and back Then you value yet to hit was point two eight now since 2020 So since June 2023 that is now point one eight, which makes a massive difference That that's the that you value is a calculation of him heat loss Through the materials of the wall, whatever's the blocks bricks timber render, whatever, but that's worked out as the total So you whatever you're using that wall The the combined some of the u-value has got to be below point one eight. That's the magic number point one eight over low It's gonna get stricter Right some examples of meeting these new regulations as you may have seen some of our videos now when we're doing a brick structure It's brick a hundred and fifty mil cavity of insulation and then five light blocks And then if we're you doing block and render if it's a block and render extension We we have to use five lights on the outer skin and the inner skin because using concrete blocks is I'll just explain this a bit. You've you've got seven newton concrete blocks, which are used below ground and for structural stuff We used we used on an extension, which is going to be rendered We just assume this should be seven newton block and when the building specter spoke to us about it They said seven newtons are very very poor Structurally, they're great But certainly the rubbish they're very very bad the cold to let the cold through so What we had to do on that extension I'll show a couple of pictures or a couple of videos and clip them in but We had the block cavity block and then what the robby's had to put Battons and insulation on the inside and then the renderers had to insulate the outside So basically about the insulation block insulation block insulation So the wall ended up 250 mil anyway, so if we'd have done it Firelights 150 cavity fiber lights, then it could have been rendered straight on and Plaster board straight on So you can still use the concrete, but you've got to put extra insulation Which is kind of it's easy to build a cavity wider than at the extra insulation on the outside and the inside And alternatives as well is using different kinds of insulation such as Kingsman Yeah, you've got different Got extra firm Kingsman What we're going up here is we one of our local builders merchants They actually had a leaflet with the examples of what we're taking in clothes. Yeah, obviously We'll show a close-up of this in a bit and we'll tell you where you could possibly find any but That's that's like this is one of our main reference points as we've been going off. This has been so helpful to us That's it your plasma part L extension solutions to reach 0.18 and I'll put all this in the link in the description, but plasma they make the five light blocks So this thing they've given us it shows you all the different scenarios You've got the 100 mil cavity. What's involved? You've got block and render. You've got 150 mil cavity Obviously it shows five light blocks and all of them, but they there are block of choice because they've they're just as good as thermal lights They're probably cheaper than thermal lights They have the structural integrity of a concrete block, but they keep thermal in as a thermal light block wood Yeah, they look like concrete blocks, but I think they've it's blown clay And then the fired very hard to cut You'll never see cracks in here in a fiber light wall You'll always see cracks down the aerated block walls like thermal lights and cellcons those really light blocks Everyone knows what they're like Lovely to build with because they're nice and light but pretty useless when it comes to structural stability structural integrity but um Definitely worth trying to get older or or Going to the website That's absolutely fantastic. I think we use That's the one we use So you've got 150 canal of dry therm 0.32 now There's a lot of people a lot of other builders that don't like the idea using 150 cavity Because obviously you're losing 100 mil off your width and 50 mil off your depth You can't go with 100 mil with the fiber lights, but you have to use 60 mil insulated plasterboards which are A lot harder to install and very very expensive. So the costs sort of even themselves out other builders don't like The fulfilled stuff that we use the the mineral wall I've used it since my apprenticeship never had a problem with it. I personally like using it It's easy. It's easy to handle easy to cut. You're not taping it and also I've always done brickwork first and a lot of people do it the opposite way around I don't like doing blockwork first and if you're going to use the the pyr stuff or the foil stuff You can get that from 90 Up to 95 mil you have 95 mil insulation and then five mil cavity Which we did do with any didn't we I'll show a few pictures of that but um The insulation is expensive The tape is expensive and you've got the extra time And I'm always worried about getting the openings slightly out with the blockwork So you've got the extra time the extra expense On the subject of the pyr boards where you've got to do the blockwork first And then you get up to a certain height You've got to insulate it. You've got to put your frisbees on or fly saucers Whatever people call them the discs you've got to tape it tape all the joints some of it. Um Some of its Cuts so when you fold it around the corners it actually seals I've used that stuff before It used to be 40 50 mil and that's getting bigger and bigger so the cavities get smaller and smaller and then If you're doing Up to a party wall or up against a fence or close to an extension There's no way you can do the blockwork first. There's no physical way of doing it. So You've got to do the brickwork first and the only way of doing that then Is um You can't fix the insulation against the brickwork You never get as flat as surfaces the blockwork And then your insulation is actually touching the outside skin then So you've got to use the mineral because that's the only other way around it Um, if you know any different let us know in the comments So the only trouble with these new regulations is You have to dig obviously you have to dig a wider foot in and get wider Trent depends on how you do your Foundations we use trench blocks. We have to find wider trench block that'll have a 350 mil 350 So the dig We'd have to dig 650 So the dig is now 650 and we have to have 350 trench block and obviously It's getting better at the moment, but builders merchants are still trying to catch up with this so It's a case of just sourcing around which builders merchants have the compliant materials so that's like one of the Struggles at the moment It's not a struggle for us because luckily for us stewart at Fairwoods, he's We've talked about this about over a year ago and he got straight on board. So he he stocks the blocks He stocks the lentils not everybody stocks the lentils yet. He, um I'm not sure they stopped the insulation yet the insulation is harder to get old of and the The 150 cavity closers, they're hard to get old of get the one get the 100 mil and anywhere the 150s We've ended up using wicks for them Um, which are quite reasonable about 10 or 10 reach for I think three meters 2.4 and what they fit in the van anyway, I think must be 2.4 they fit in the van Yeah, and in so insulation like that said it's still a bit difficult to get a hold of so You can either get lucky in some builders merchants or you have to order it specially We actually use selco Because it's in stock all the time And it's quite handy to get hold of And just while we're on the topic of the insulation While you if you're using the cavity beds like we do The specific one you have to buy is the 0.32 because that is a denser and more denser right warmer is The 0.32 is denser and warmer because the one we used to use was 0.37. It doesn't meet the u-value. Yeah, it's given example It's um, it's probably half the price For the 0.37 and when you open a packet point 0.37 at 150 I think you get six in a pack Because it's not as dense so they can shrink wrap it down to the same size because the packs are all the same size But you open the what the 0.32 and you only get four sheets per pack so you've got to take that into consideration the extra cost and How many there are out per pack it'll tell you on the pack how many square meters in the pack And obviously when you work out you've got 60 brick per square meter So if you've got 600 brick that's 10 square meters So you need 10 square meters of insulation right next we're going to talk about steels because um, the big thing now is knocking the back out of people's houses And having big by-fold doors and also on a lot of extensions we do they have by-fold doors So obviously big wide openings So you need a big steel across the top so You can't get lintels quite big lintels, but It's very expensive And it's cheaper to do the steel but obviously steels Usually an rsj I'll click a link or picture With a plate welded on so you've got your rsj for your internal for your roof to go on to And then you've a plate welded on So you've got this plate welded on That's wide enough to go across the cavity so you can get your face work across the front or whatever you're putting across But what that means is you've got this piece of steel that can run from the outside through or see inside above the door That's a big cold bridge in itself Because obviously steel is a good conductor of heat and cold Now i'll put an obviously another link in the description, but delatoll carpenter He's come with a clever way of Cladding the steel instead of just sticking this plasterboard around it and plastering it He's uh, he uses the hardy backer that he's using bathrooms and showers and um wet rooms And that stuff is like a foam So in itself it's it's insulates And when he sticks it on he dabs it on so it has a little bit of an air gap around it So it can breathe to avoid condensation And then once that stuff's on you can um, clad it with plasterboard and plaster obviously But um, I'll leave a link for that. It's a really good video and definitely worth the checking out Because it's a good way of Meeting these requirements if you need to put a steel in yeah, because like you say sometimes It's a bit of a gray area that because it is a they're trying to cold bridging is the big is the big enemy moment and A steel is just a massive cold bridge and they're just Just trying to work the way around it. It's it's again, it's new rules. So they've got to find ways around them But um del's idea is really good and definitely worth a look Link in the description or Um that way And one last thing we want to touch on is we're going back down now back to below the slab. So obviously That's not the other big thing as well as making sure The gray your ground is your floor is insulated as well. So We used to use 125mm jub light for our insulation under the slab jub light is a brand name, but basically it's polystyrene Thank you. Um, but if we still want to use the jub light polystyrene insulation, we'd have to go to 160 minimum minimum And they don't make 160 it either do it. They do it in factors of 50 or 25s. So you can either go 150 and then it jumps up to 175 because you've put a 25mm strip But it's messing about and by the time you go into the really thick jub light it starts to get expensive So it sort of brings you back down to the same price as the 100mm PIR boards, which is the one we use now extra the Kingsband cellotex everyone knows that stuff So we use the 100mm PIR boards that obviously reduces the amount of insulation you need under We have had people in the comments tell us that they have to use 150 But up here it's still under at the moment But I could see it going to 150 eventually, but obviously the thicker insulation the more you've got to dig out To get you depth for your hardcore, etc And but one of the most important things when you're doing insulation is First off you have to have two layers of DPM one straight on top of your hardcore sandblinding and the insulation sits on that that protects the PIR from getting any dump and then one over the top because obviously that's where your hungry is being poured but in between Your walls and your Layer of DPM you need a cold bridging strip, which we just use we use 25 mil jub light insulation and we cut that down to slot 200 mil strips. Yeah so that it's um You've got the 100 mil for your slab and then 100 mil drops down below the insulation So when you put the boards in it clamps into place so it won't move We'll show like a picture or a video of of an example Yeah, we used to we used to cut 100 mil strips and you put it in it's just all fallen over But the the 200 mil strips it goes right down It also protects the end of the PIR board as well if you've got post down at the end of it And obviously that stops any cold Trying to come in through the outside with that bridge in the way I'm not sure they do it anymore, but um, I have seen a few times where the insulation When you start building from DPC on the superstructure the insulation has to drop I think 150 below below the DPC And I think I think the cold bridging strip is just another alternative to that I'm not sure he has to do both But we don't have to do that. We're not told to do that with the insulation It's obviously a bit harder to do that with um, mineral because it's it's it's Our first piece sits on the towers at DPC. So that's it So if you're going below DPC, it's a bit more difficult to hold it in position So it's pain in the arse basically And that just about covers it for what we have to offer obviously It's the absolute basics. Yeah, this is this is just the basics of how we These are just the rules we apply when we're doing our extensions if you need any more information like this We're going to leave plenty of links in description to the government website describing the building regulations We're going to leave one hopefully for plasma for the There you go Get yourself one of these And if you can't we're going to leave the link to the script. We're going to leave a link to this I should imagine you can doubt. Sorry. Sorry, Alex. I should imagine you can download it off the website so Try and get yourself one of them Get one or download one Check your local builders merchants or material suppliers because it was it was from our local one We actually picked a few of these up and was handing these out to other anyone who wanted one. Yeah And we're going to leave some links to some of our other videos showing how we execute these Requirements in our extensions. We're going to leave a link for del the tall carpenter with his method of solving the coal bridging problem with rsj steels and Any other links? Oh stick them in when we have them when yeah, so For any extra information or any references be sure to check our link that all the links down below We'll have them labeled. You just click on the ones you need So that will be it for our basic cover of the part L conservation of fuel and power building regulations. Thank you very much for watching Thank you Do you want to change your glasses? No Are you sure? Can we work once so Yeah, we're not gonna work, are we? We're gonna work, yeah, talking about work Do you know I'm just look smarter I'm not going upstairs Okay What do you try to say? Do I look good in my videos? I'll play your glasses at once Like um spike hits George Collins guys is um removable Eye blacker George Clooney He was the president in spike hits And then there's at the end of the first movie George Clooney Yeah Are you sure? Yeah He was the president and he was there with blacked out eyes Then he takes it off because it's like glasses Right Right anyway That's a that doesn't mean you need to get rid of already So back then If I'm looking out there I keep looking out there and still looking there So so back then I did it again