|
The aluminium
flashing on the header wall got wet leaving damp marks. Aluminium
is great for waterproofing if it's done properly. It can withstand
high heat temperatures, is very strong and durable and doesn't rust.
If it's not installed correctly water can seep in between the joints
of the aluminium sheets and cause water damage.
This is why
we use a toch-on waterproofing system. It has all the attributes
and qualities of aluminium flashings but it can be molded to melt
and shape over almost any object. In the picture to the left you
will see that the torch-on waterproofing was torched against the
header wall at the foot of the tiles. The edge of the torch-on was
heatfused over the highest brick. When water runs down the header
wall it won't run underneath the torch-on waterproofing system but
over it.
Once all the
slate roof tiles has been removed make sure that all the battens
is clean from clout nails. This will make the roofing
process much easier as the clout nails will lift the slate roof
tiles and make all the tiles uneven.
In the next
step of our roofing project we will lay the malthoid on the battens
of the roof. Malthoid is available in 2 and 3 ply thickness and
comes in rolls of 900mmx20m. It's used for waterproofing.
In the picture
to the left you will see that the malthoid is laid out horizontally
over the battens of the roof. You'll notice that we started the
roofing project from the lower part of the roof.
After you've
laid the malthoid on the battens of the roof and put the slate roof
tiles in place you're ready to space the tiles.
All you need
to do is use a slate tile and position it in-between the two tiles
you want to space. Remember to pack the first row of slate roof
tiles as perfectly as you can in a row.
Each roof slate
tile has 2 holes which is used to hammer 2 clout nails through.
These two clout nails will fix the slate tile down onto the battens
of the roof. The 3rd hole in the middle of the slate tile is used
for the copper disc rivet as shown in the section "example
of a copper disc rivet" further up on this page.
When doing a
roofing project it's very important that your tiles line up perfectly
from left to right on the roof. If the first row of tiles are skew
the rest of the rows of tiles will also go skew.
Use a chalk
line and shoot a straight line on the bottom row of tiles. Make
sure that the holes of the tile to go on top of the bottom row of
tiles line up with the battens. If not the second row of slate tiles
won't be able to be fixed down.
Once you've
made a chalk line you can start to lay the slate tiles. Notice that
the roofing contractor is hammering the clout nails that is positioned
in the middle of the tiles on the sides. He is also resting his
hand in the middle of the slate roof tile as this is where the batten
is running under the tile.
You will see
in the picture to the left that the top row of tiles are perfectly
lined up on the chalk line.
Malthiod is
900mm in width and covers just about two slate tiles. When you lay
the malthoid make sure it rests comfortably on the battens and overlaps
onto the slate tile. If this isn't done correctly the malthoid will
slip off the battens and allow water to leak. If the molthoid doesn't
over lap on the second row of tiles water could also leak in from
the tile which will be placed on top of the second row of tiles.
|
