DRILLING HOLES IN JOISTS & WOOD FOR PLUMBING – Plumbing Tips

Posted by in Plumber Talk, on February 24, 2017


Drilling holes in joists for plumbing and pipes is easy and we show you how in this video. There are regulations in the UK you must follow in new build installs. However on older buildings that is impossible. We show you how to measure out, what tools you need to drill the holes, and how large to drill them.

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Hope you’re gonna enjoy this video today, guys. Before we go right into it… Oh, I got a bit of a throat, as you can probably hear. If possible before we continue this video today, please do subscribe to our YouTube channel. That’s most important. Really happy that we’ve just hit 50,000 subscribers and we’re nearly at 14 million views, lucky YouTubers. So join our 50,000 subscribers and click that subscribe button now. Also, if you want to have a look down below in the links, we’ve got links to our Twitter and our Facebook. It’s a really great way for you to get in contact with us if you’ve got any photos or any problems, anything you want to share with us, you can do that on our Twitter and Facebook pages.
By the way, this is the start of a series of videos about an installation of an en suite that we’ve got going up behind us here. I’ll show you the layout for the en suite in a minute and then you’ll get an idea about why we’ve drilled holes in these joists where we have. Anyway, I hope you enjoy today’s video and remember, there’s one thing you all got to do. That’s hold tight!
So what we’re looking at today is how to install pipework inside timber joists. Now I had a look around on the interwebs about this and there’s not really many great videos about it. Most of them are from America where the regs are slightly different because there are regs that you need to think about when you’re doing this sort of thing if you want it crossed off by builder control. They’re gonna come out and have a look at it and they’re gonna want to see that your pipework has been installed properly. It might sound a bit mad that drilling a hole in a bit of 7×2 timber or something like that needs regulations, especially if you’re only putting a 15mm pipe through. But they are there and you do need follow them if you want to get this stuff signed off. So let’s have a look at how to do it. Number one, the first thing I want to say is this. If you’re drilling a 22mm pipe, say that’s what you’re first fixing, which is what we’re gonna be doing here today. But also we’re gonna to be running a little bit of 15mm as well. If you’re doing either of those two, I generally err on the side of going at least 4mm bigger than the pipe that you’re fitting, hole size. So if you’re fitting 15mm pipe, then it’s a good idea if you can find 19mm hole saw minimum, really. The reason for this is really because of ease of use.
So when you’ve drilled all your holes, you can pull your pipe through real easy and it will go in. And not clacking on the hole because it’s too small. Also, another reason. If the pipes get hot and cold a lot you don’t want that to be rubbing on any of the timber. That needs to have a nice even way of being able to move forward and backwards as it contracts and expands. That’s another reason as well. Leave your hole a little bit bigger than it needs to be. Don’t worry. If you’ve done this properly, if you’ve worked out your calculations properly, drilling a larger hole isn’t going to structurally affect the building in any way whatsoever. So don’t worry about that. So watch me now. I’m going to show you how to measure out the timber and then basically we’re just going to wang some holes in and then in our next video in this series we’re going to show you all about first fixing. So let’s give you an idea about actually where we’re going. We’ve got a joist kind of across like that. And this is the general shape of the room at the moment. Now our main services are coming from the house from the extension through here. Which is that joist just up there. Now above stairs there’s going to be a radiator here, and also a radiator here under the window. This is partitioned off upstairs because we’re going to have a loo here, a shower there, and a basin here. Which brings us on to the next bit. We’re also gonna have a hot and cold. So the first thing we need to think about is getting our flow and return in for our radiators across here and here and there. Those will T out like that.
Then also we need get our hot and cold in over here. So now I’m gonna measure out exactly where we need to put our holes in the joists in line with regulations.

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