Posted on: December 29, 2016 by in Plumbing Videos
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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.
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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.
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– [Narrator] Plumberparts.co.uk,
home of Find Your Plumber.
So what we’re looking at today
is how to instal 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 15 mil 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 22 millimetre 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 15 mil as well.
If you’re doing either of those two,
I generally err on the side of going
at least 4 mil bigger than the pipe
that you’re fitting, hole size.
So if you’re fitting 15 millimetre pipe,
then it’s a good idea if you can find
19 millimetre 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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