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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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Websters
Insulation Limited, Crow Tree Farm, Crow Tree Bank, Thorne Levels, Doncaster,
South Yorkshire, DN8 5TF | tel:01405 812682 | fax: 01405 817201 | email:
info@webstersinsulation.com