REGULARS: ROOFING MATTERS
Insulation and waterproofing systems need to be determined together to ensure delivery on client specifications.
together to ensure the client’s brief is
achieved for long-term performance.
Installing insulation onto a
roof before waterproofing
Best practice in terms of the installation of
insulation is dependent on the type of
waterproofing system to be used above or
below it.
There is a vast range of waterproofing
systems from screw fix polyvinyl chloride
(PVC) membranes, liquid applied coatings
through to flame applied torch on
membrane systems and – depending on
which system is used – will dictate what
type of insulation system will be considered
to achieve the required thermal, fire and
acoustic performance.
The insulation must provide a flat
surface on which to apply the
waterproofing. Therefore, the density of the
insulation is important to consider when
ensuring that the area to be waterproofed is
firm enough to withstand the weight of the
installation team. If the insulation is not at
the correct density, then the waterproofed
surface could show undulations that will
cause water ponding conditions.
When installing
waterproofing, what is
best practice?
All the various waterproofing systems have
a unique installation methodology with
experienced contractors who install the
systems. Most waterproofing contractors
are experienced in the installation of the
insulation and the associated
waterproofing system. A compliant
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