Hi, I'm Omar from Specialised
Waterproofing and Trades Group.
We've been invited to do a green roof here
in this property.
The main issue,
is that water penetrating
through the roof above.
It's a plywood structure.
Sometimes you do
have concrete structures,
but this one's a plywood one,
as the contractor wanted
to do a lightweight construction.
So, first instance for doing
any sort of waterproofing is preparation.
And what we do first,
If it's a sound or
new area, we will floor scrape it
or we will cup grind it
with our diamond cup grinders
and then we will blow off the whole area,
sweep it and have it
ready for membrane installation.
The membrane that has been
specified for this project,
is the Sika Sarnafil G 410-15 L
It's 1.5 millimeters thick.
This is the role here, it's two metres long.
Here's an off-cut showing
what the membrane looks like.
We do have external
and internal patches which are used on
the project, so wherever we cut a
internal or external corner, we do have a
proprietary thing that goes over it
it, which is hot air welded.
There are other ancillary items too,
which can be used for solar
or air-conditioning units
and you do have
other types with threaded rods
where they can be fixed
onto the substrate.
There are also proprietary
profiles that are used
for termination.
And that's where the membrane
is terminated to.
We've laid the membrane down here,
the Sika G 410,
Ready to have the laps welded.
For large areas,
we use the robotic welder,
which will run along the lap,
which we'll demonstrate shortly.
For detailed work we use the
handheld guns which will
fuse the joints together,
pushed with the silicon roller
and brass roller.
[lap welder fan noise]
Now that the welds
have been done, we'll actually
get our probe testing tool
and we'll run along the laps
and we push as hard as we can
along the lap
to ensure that we have a water tight seal.
Alright, we're up here on the green roof
and we've started to install the
perimeter profiles, which
is the termination
where the membrane stops.
They're here like this.
We also mechanically
and chemically secure them to the
substrate, so there's no chance
of any movement.