Project1_Layout 1 07/ROOF WINDOWS
What to look for when it comes to
roof window weather resistance
For the third in our six-part series on the technical factors to consider when choosing a roof
window, Lee Griffiths, technical sales manager GBI at Dakea, considers why strength and
weather resistance are so important when it comes to getting it right
Just like the rest of the roof, roof windows
Roof windows are exposed to storm damage from flying debris and the force of the wind
are exposed to the very worst of the
weather, including storm damage from
flying debris and the force of the wind
itself. If not selected and installed
correctly, the window may fail, which is neither
good for your customer or your professional
With the inclement British weather becoming
ever more unpredictable and severe storms,
previously thought to be a once in 100-year event,
now happening much more frequently – it has never
been more important to choose products that are fitfor
purpose, whether for a newbuild, replacement
or a new addition to an existing property.
However, with high quality aluminium clad roof
windows available offering a lifespan in the region
of 60 years, it is reassuring to know that a window
installed now will be able to cope with the weather,
even into the second half of the 21st century. But
it’s not just about the external factors of a window’s
construction; it must be able to resist impact from
the inside as well.
The pressure of rising house prices is meaning
many homeowners are extending or reconfiguring
their homes, rather than moving, with loft
conversions often used to create that extra bedroom
or much-needed play room.
Roof windows are perfect for such situations,
offering that all-important natural light, but from
a safety perspective it is important that the glass is
both strong enough to withstand any impact and
not present a hazard should it be broken.
Choosing a high quality modern roof window
will ensure both longevity and weather resistance.
For example, the Dakea Ultima roof window
features resilient panes inside and out. The
construction also includes an advanced “welded”
seal system to ensure durability and watertightness.
Furthermore, with a 6mm thick toughened
external pane, which is 1.5 times thicker than
average, the window is even resistant to heavy
impacts from the outside. It has also been tested for
wind speeds of up to 104mph – the equivalent of a
Category 1 hurricane.
For added safety, the 2x3mm thick internal
panes are laminated so that in the event of an
impact that is strong enough to break the glass,
the shards will stay in place rather than fall into
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