Today we have a visit from building control - 3 Extensions in 1 - Episode 21

Añadido: 2026-05-21

[00:00:08]Good morning everyone. Welcome back to another video. It's a lovely sunny day in London and we are back on the extension build. So today is uh inspection day excavations. Spoke to building control this morning. So we're waiting for him and um we had a little chat a couple of things. So, we're going to just run through a couple of things when he comes. In the meantime, me and Kenneth are preparing our measurements for concrete. We're going to work out our volume of concrete that we need here so that we can book the right amount.

[00:00:41]We're going to need a pump as well. And also working out the cost. It's got a lot of money cuz it's a lot of concrete here. Um, so we've done a rough estimate and I estimated about 38 cubic meters.

[00:00:54]Uh, no, sorry, not 38 cubic meters.

[00:00:56]That's that's a lot. Sorry, 38 linear meters. Um, and from that we can work out what our cubic meters are. So what we do is we multiply the linear meter, that's basically the length of the trench by the width of the trench, which is kind of set. Some places we were like 800 wide. So way over on some places and some and the rest of it we're 600. That was because when we had the excavator, we only had a 750 mil um spade and not a 600. So, we had to dig more than we needed to. Just means we could put more concrete in more substantial foundations. So, it's not a bad thing.

[00:01:34]Just cost me more money. Um, so there's that. And then also, we have got to work out the depth of our concrete, what our depth is going to be. So, we're working that off the existing house and what makes sense cuz there are step levels here as well. So um we have done some calculations and stuff and we're looking probably at the moment about 625 mil roughly for our depth of our our thickness of our concrete. Now on on the building control drawings our minimum depth is 225 mm. So there is a sometimes a misconception about concrete. Everyone thinks you have to have lots of concrete to have a stable foundation. No, that's not the case. It's more to do with the ground that you're building onto. So, the concrete itself doesn't have to be very thick, but it needs to be on the right ground. So, we basically um we're at the right depth, which is a meter, and we're on a good chalky foundation here. Um so, we can go anywhere from 225 mm up to full field pretty much almost at ground level sort of thing. Um, so you just have to work it out. There's a balance of putting in more concrete, which means less foundation block work to do.

[00:02:52]Um, but what's the cost of the concrete compared to the cost of the block work and the time it takes to do the block work? So, it's probably it's pretty much kind of sometimes it's probably probably a little bit cheaper to do concrete uh more concrete and less block work underground uh just because of the time and sometimes depending on how difficult it is here. We've got 38 linear meters as I said of block work to do. So, we want to avoid as much as we can doing too much block work underground.

[00:03:24]But that being said, we've kind of worked it out roughly at 625 is what we want to go for.

[00:03:29]This is most of the concrete foundation filled or most of the trench filled and then we'll build out of the ground in block. So I'm going to show you number one how we measure the linear meters. Um I've got a laser level makes it a lot easier. I'll explain that. And then we're going to work out how we do our leveling and we're going to put some stakes in the ground to give ourselves some levelings. We also got two areas that we need to box step up. So we've got to do that as well. And then we've also got to box in around um a sewer pipe as well. So got a couple of things to do in preparation and then fingers crossed in two days time we can get a concrete truck here and pour this concrete. So anyway, enough yapping. I'm going to show you guys what we're going to do now. This is the tool I'm using to measure the trenches. So obviously you can use a tape measure and measure your length from from your trench. Typically what you would be measuring is for instance you the concrete's going to start here. So you'd measure from here and you'd measure all the way down to here. And then obviously you'll measure it down here. But what you need to take in consideration is if you imagine you're going to fill your concrete, it's going to come all the way to the width of this trench, right? So you imagine that trench is going to come all the way here. Your next measurement or your next bit of concrete really is going to start start from here. It's not going to start from here. You could over measure it, but we're going to measure from there to there. And then we're going to start from here. This line across the next bit. Now, I'm going to be using this cuz it's just a lot easier. It's quite accurate. So, what it is, it's laser laser meter level. So, I've got it set in meters and four decimal points. So, it's quite accurate. What's important when measuring this is to make sure that you're in the right setting here. So, that square is represents this machine.

[00:05:17]And then you can see you've got a line touching the back of it and an arrow going forward. If I press uh this button. Oops, not that one. Sorry.

[00:05:27]Let's start again. We got it on straight line. That's what we're working on. Um let's change this. So now you can see that little line is gone to the front.

[00:05:36]So that is measuring the distance from the front of the machine to wherever the laser points. And um on this setting, this is measuring from the back, which is where I want it. So, what I would basically do is I will rest it on on here like this. You can see it's resting on the wall. Okay. A lot of people use these to measure rooms. So, you would touch it on the wall here and it would measure from the back of here to wherever the laser is. This laser is quite bright actually. It's a red laser, but it's quite bright. So, I can see it maybe 15 20 m away. Now, if I press the read button twice, I can see a laser on the wall on the soil here. You might not be able to see it. And we've got 2.4 m. So, I know from here to here is 2.4.

[00:06:26]So, I've made a note of that already.

[00:06:29]Then, I'm going to measure from basically roughly where this line is, which is about here. So, measure from the back here and I'm going to measure um to that little bit of wall where the pipe is over there. So, I'll set the laser onto that and I'll measure it again from there and I've got 4.5. So, it shows me, it tallies it up as I'm going along on the screen. So, it saves the data. So, that's the first measurement.

[00:06:55]That's my second measurement. It's ready for the third measurement. So, my third measurement, we're going to measure basically from the back of this cuz this is where our boxing is going to be. So, we'll measure from the back of this and we'll press it and it'll measure from the back of it. Oops.

[00:07:16]Sorry, my tripod might be in the way.

[00:07:23]Let me move this out the way.

[00:07:29]So, we're basically going to measure from from here.

[00:07:37]So 3 point call it 3.8 3.79. So that's measured from there to there. Just like we did before instead of me measuring it from this wall cuz we don't need to include this area here. I will start it from about this line here. And I can measure that all the way up there.

[00:08:00]You do have to try and hold a steady hand. It helps if you've got your rest against the wall.

[00:08:07]Let's see. Try again.

[00:08:19]Right. So, that was our final measurement is 13 m. So, we've got 30 m from here all the way down down there. And then I can measure the other trenches as well, which I've done already. So, I'm just going to show you how we do it. So, we worked that all out and our measurement came out to exactly 36 m. So, we got 36 line. Now, what we do is we multiply that by the width of the trenches. In most cases, the trenches are 600. All these trenches here are 600 all the way down to all the ones we've done inside the garage. The ones we've done over there is a little bit wider, but most of it 600. Some areas are 800. So, I'm just going to go for 700 in the middle to sort of average it out. So, we'll multiply 36 by keeping meters. So, it'll be multiply 36 by.7 m, which is 700 mm. And then we're going to measure it, multiply it by the depth, which is 3, sorry, 0.625 mm. Okay. 625 mil. So we multiply that and that gives us the cubic meters or volume of the trenches that's going to be filled with concrete. Now we worked that out and I think we came up somewhere in the region of 15 cubic meters or something like that. I can't remember it was 13 or 15 cubic meters.

[00:09:38]So that's what I will call up the company and tell them that I want and I'll book a pump with that as well. So, um, yeah, and then I'll just get a quote of that for the price. So, I know roughly what the prices are. Probably somewhere in the region of 180 a cubic plus pumps plus bats, plus delivery cost, all that stuff. So, we're going to somewhere between 3 and 4,000 probably for the for the concrete for this. So, um yeah. So, we're going to um uh start doing the uh measurements uh heights, laser heights. So, [snorts] we're going to use this tool as well, which I'm going to show you guys how we do that. And we're going to get some metal stakes in here and start laying leveling it out where we've got the step ups. I just show you where we've got the step ups here. We've got a step up right here. And what we want to do is we want to keep the concrete consistent. So, um, we could just go straight over it. Uh, but what it would mean is the concrete would be sort of like maybe 4 400 mil over here, which is fine as long as it's within a minimum of 225 mil. because there's another step up, then it starts to get a bit too thin up there. So, what we're going to do is we're going to box here and we're going to raise our concrete up so we can continue our 625 mil up to that first step and then up again so we get 625 all the way up the top as well. So, that's what we're going to do and keep it all consistent. Okay.

[00:11:05]So, next job is getting the stakes out and leveling them all up from here all the way around.

[00:11:13]All right. So, we're setting up now and this is where we are going to be going.

[00:11:19]Unblocking it.

[00:11:22]You can see we've set our um I'm blocking it. Anyway, this is where we're setting our mark at 62 and A2.

[00:11:33]We need to slide down tight. Tiny bit down. Ken, stop. Up.

[00:11:39]Just down a touch.

[00:11:41]Yeah. Stop there. Up.

[00:11:47]>> Moving too quick. Have to move a tiny bit. R.

[00:11:54]>> There we go. Cool. So, that's our mark there. So, what we do is we know we've got our level 62 and 1/2. So, we're just going to use that level to do our stakes all the way down. Guys, so it is after lunchtime. Building control came around.

[00:12:10]Everything's good to go. And concrete has been bought as well. So we bought 16 m cubed of concrete and that's coming in 2 days time. In the meantime, we picked up some rebar. We've cut some 1 m lengths of rebar and we're going to use those to set up our stakes for um our concrete level. So, we'll probably put one every every two or three meters or something. Every two meters maybe, we should be fine for us to um use to get our level with our footings. And we're going to work that all the way around the building.

[00:13:08]Okay, let's just go down a little bit more. Another two inches.

[00:13:16]All right.

[00:13:25]All right.

[00:13:32]Gone almost an inch.

[00:13:36]All right.

[00:13:41]Like a little That's a cimeter.

[00:13:50]Okay.

[00:13:56]little bit again.

[00:14:02]>> Yeah, that's fine.

[00:14:03]>> What do you want to hear about?

[00:14:07]>> Let's see. Let's go. Let's go.

[00:14:12]>> All right. Hold on. Hold on.

[00:14:13]>> Let's check it.

[00:14:14]>> Let's check it. Let's check it. Where we at?

[00:14:19]>> Oh, right here. Isn't it? I'm in the way.

[00:14:22]Go on. Keep going. Go on.

[00:14:27]Go on. I can see it. I can see it. Go on. Go on. Keep going. Keep going. Keep going. Keep going. Go on. A little bit.

[00:14:34]Again. A little bit. Little bit. Little bit. Stop there.

[00:14:42]All right.

[00:14:44]Cool. Moving on.

[00:14:47]Yeah. Let's do one here. Bring it closer to that. A little bit closer. Yeah.

[00:14:51]There.

[00:14:51]>> We're going to box that in.

[00:14:53]>> Yeah. He's literally going to go right up to it. Tight to it.

[00:14:58]Hit the stone. All right. Move it over a bit.

[00:15:20]I can see it there.

[00:15:26]>> Yeah, that's perfect.

[00:15:27]>> I'm bad.

[00:15:32]>> All right, guys. So, we're done. This is the last section. This was the other further extension around the back. And just show you how we've leveled these out. There we go. You can see there.

[00:15:43]What we usually use is this little line here.

[00:15:46]>> Oh, sorry. And that's what we want.

[00:15:51]Okay. So, that's the top of this steel.

[00:15:53]So, we've done down here, done here as well, and we've done all the way around the other side, which I'll show you. So, basically, that's that section here done and ready to go. We've also done this section here. As you guys can see, there's our steak here running all the way down that way, running that way. We just got some boxing in to do which we will do on the morning of concrete. So we need to box in here. And also we've got some boxing in to do cuz we leveled up. So as I was saying before about the steps, all this is level. And actually when we did our level, this level was actually like 1 cm out from that end. So we dug this really flat. So when we come here, we step up. So, we're going to box some boxing in here cuz this side the concrete is going to raise up. It's going to raise up to the new height here. Okay. So, this height is um a full block higher than that side, which is 225 mil higher. Then when we come here, we go up one full block higher again to 225. And then this is all level all the way down here. It's level to there. That's our concrete. You can see our concrete's going to come to similar place to where the concrete was before. And then we've also got concrete here as well. We got concrete here. So I spoke to wooden control about this as well. He's cool. What he what I said is that we're going to just run a new one.

[00:17:18]So he said, "Yeah, just pour that and just condemn it basically." So that's what we're going to do. So it gives us a bit of time to get the pipe work sorted out later. So that's that. And uh yeah, guys, our trenches are finally there.

[00:17:33]And yeah, guys, that is it. We are packing up. We are off for today. And I hope you guys enjoyed today's video. If you did, please like, comment, share, and subscribe. And we'll see you guys soon. Take care. Thanks for watching.