If you have an underfloor, that's constructed out of web trusses like
these, then perhaps you're wondering how you can insulate it. Hi! I'm Maurice Beinat,
I'm Technical Director at ecoMaster, and in this video I'm going to show you how
you can easily insulate a subfloor made out of web trusses such as these. So in
order to insulate an underfloor made out of web trusses, there's really just two
parts to it. You can certainly use our regular underfloor material, and if you
measure the spacing, the center, leading edge to the leading edge, it's
probably going to be about 450, the same as our material. But of course you can't
just lay it straight across because as you can see the web trusses have a 90
mil timber laid on the flat. So that causes us a little bit of an issue. So
the simple thing to do here is actually cut the material lengthwise, into two, so
that the big piece fits between the trusses, and the little off cut gets
pushed up between the webs. Okay, so the part in the middle gets stapled to the
floor, so pull aside a little bit and staple through about 20 or 30
millimetres of the material into the floor. And the part that gets threaded
through the web truss, well mostly it gets held up by the material either side
but you may need the odd staple just here and there. Just to secure it, and of
course where parts join together. So let's have a look now at that actually
being done. The first part is to measure the space between the web
trusses, and add 10 millimeters, and cut a length along the material to that width.
And the offcut we're going to put in the web truss.
So step one, measure and cut; step two, fit to the floor. The first step is to
measure the space between the trusses. In this case we've got 365, and so we're
going to cut the material at 375, and the offcut is going to go in there. Before
cutting the material, it's important to set up a nice work surface. So a good
idea is a couple of the underfloor rolls on the flat like this together, and
something on the top that you can cut into, so that we're going to put the
material over the top and we're going to cut along this way, and pull the material
along and cut. So that that way, we can cut any length up to the full roll at
the same width. Once we've got our work surface ready then we can unroll some of
the underfloor material on top of our cutting surface, and then we're ready to
go. Now it's really good to have a piece of straight timber, so that you can just
lay it on the surface of the material that you're going to cut. It's going to
make it very easy to run the angle grinder along the edge of the timber. So
we need 375, so we can just, put the, use a measuring tape to line up the edge of
the timber at the appropriate place. Like that. And then the next thing is to run
the angle grinder along the timber just to mark the cut, then move the timber off,
and complete the cut with one or two further passes with the angle grinder.
Make sure you've got your ear defenders on.
9-inch grinder.. Straight edge ready to go.
Take the straight edge off, you've got a cut there.
Okay, so we just need one more cut, in order to finish this off.
So there's the cut. This part is going to go between the web trusses, and we're
going to staple through just 20 or 30 millimeters of this each side into the
floor. It's good to use the slightly tougher edge rather than the fluffier
edge - use a slightly tougher edge against the floor in this case. And staple along
like that. And the offcut, gets slipped into the web trussing, and then turn
sideways. It's going to end up about the same level as the bottom of the
insulation. And you might need one or two staples just where the web trussing
is less frequent, just to hold it together. And also if you need to join
pieces, then staple where there are joins. But basically using this
method you can cut any length up to the full 11.6 meters of the roll,
and go all the way across. So we've cut the material and we're ready now to fit.
So we start with the slightly heavier side towards the floor, and we're just
going to feed it in, like this. And push it up, like so. And then we're going to
pull the material aside a little bit, and staple into the floor.
Once the centerpiece is fitted firmly, then it's time to fit the offcut into
the web trussing. So the way we do that is we're going to thread it this way, and
then we're going to turn it 90 degrees like that, and push it up hard. That's it. And make
sure you turn it 90 degrees. You'll need to staple in the end, and you might need a
staple here, where there's not much web trussing. Otherwise when the material
goes in the other side, it's going to press into that, and it's going to hold
it pretty firmly up against the floor. And so you can see we're going to have
quite a nice finish.
So there you have it, you can see above me the finished result. So simple to do.
First up measure the width between the trusses. Remember that it may be
different from time to time, they're not necessarily all uniform. Cut the material
along the length. A piece of timber is a great tool to facilitate that. Use a
9-inch grinder, be careful - of course rotating machinery, so you wear ear
protection. And then staple up in place, and thread the offcut through the
webbing, and turn 90 degrees. You're gonna get a great result like this.
Everything's going to be perfectly insulated. So there you have it, how to
insulate an underfloor that's made out of web trusses. Thanks for watching, I
hope that's been helpful.