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Spray-applied
polyurethane foams (PU foam) meet the Building Regulations
in respect of condensation control by compliance with
the Approved Document F 'Alternative Approach' for non-ventilated
roofs. Calculations are made using the method in BSEN
ISO 13788:2002 (and BS 5250 Appendix D): Code of Practice
for Control of Condensation in Buildings. Surface and
interstitial condensation on all building surfaces can
easily be prevented.
The ultimate
pitched roof design is 100mm PU foam or fibre at ceiling
joist level, unventilated loft space and 85mm of foam
at rafter level to provide the perfect balance between
optimum thermal performance and zero condensation risk.
This construction retains the storage usage of the loft
space, negates the requirement for insulation to pipes
and tanks and installed roof ventilation systems and achieves
a U-value of better than 0.16W/m2K.
When applied
directly to metal and asbestos roof types, the problem
of condensation is immediately solved. Whilst insulated
panels may still be able to offer a similar level of thermal
protection, they cannot eliminate condensation owing to
the fact that they are merely fixed in place and not bonded
to the cladding as PU foam is, meaning condensation will
still form above the panels and subsequently drip down
onto anything below it, including ceiling panels, expensive
equipment and such.
As little as
15mm of sprayed foam is able to eliminate condensation.
It is no wonder we are taking more and more enquiries
for this, and as a result our experience and knowledge
has increased to allow us to provide a solution to any
condensation problem you may have.
Call
us on 01405 812682 to speak to one of our friendly advisors.
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