British Standards for Roofing
Installing a roof should always
be done by a Certified Installer due to the nature of work and expertise needed
to carry out such a project. A certified installer is well versed in the regulations
and rules as well as being up to date with regulations. This is highly
important due to the fact that you are liable if the standards aren’t met and
can be penalised alongside needing to re install the roof.
A new roof will be required to:
- resist
weather
- resist the
spread of fire from one property to another
- be able to
support loads (weights)
- provide
resistance to heat loss (insulation)
- be ventilated
to protect from condensation (in most cases)
- have adequate
drainage
There are generally two types of roof construction used:
- Pitch roof -
This is where tiles or slates are used, and a void is usually created
underneath.
- Flat roof -
This usually consists of felting which has a slight fall to allow rainwater
to drain off.
To
enable compliance with the requirements of the Building Regulations to be
demonstrated, full details of the new roof will be needed - including materials
and their dimensions and performance properties.
Covering
The
materials used to cover the roof should be durable and capable of resisting the
elements of the weather. With a pitched roof the type of tile or slate
you wish to use will be partly governed by how steep or shallow the slope
is. If the roof is close to a boundary, which is often the case, the roof
should also have properties to limit the risk from fire spreading across
the boundary.
Ventilation
Not
all roofs need to be ventilated. Ventilation is not required to a warm
roof system, which is where the insulation is placed above the joists or
rafters. Otherwise, ventilation is required, and this is known as a 'cold roof system'.
When
ventilating a roof, the air should be able to enter at one end and travel
through to the other end where it can exit.
Re-roofing
If you are preparing to re-roof less than a quarter of your entire
roof space, then the likelihood of needing local authority approval for the job
is minimal.
On the other hand, you will need government approval in the
following cases:
- You are planning an extension
- Your roofing project will cover more than 25% of your existing roof
- You are making structural alterations to your roof
- The performance of the new roof will be significantly different to the existing roof
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