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EXTERNAL ENVELOPE
As liquid-applied membranes can be manufactured in bespoke colours, this makes them ideal for heritage projects featuring aged copper roofs
Specification considerations As with any roof refurbishment or renovation, it is essential that a liquid membrane is correctly specified and installed for a heritage project to ensure it performs to the required standard and that historic buildings are protected for the long term. With such a large number of liquid roofing products now available, specifiers must ensure they thoroughly research which one is most suitable for the application. As well as complying with building regulations, and in some cases the requirements of bodies such as Historic England, there are other important considerations; such as resistance to fire of the proposed roof build-up, the compatibility of the surfaces to be waterproofed, ability to withstand substrate movement, and resistance to damage from anticipated load levels or trafficking. Independent product accreditation is used to establish conformity and suitability, so it is advisable to research the manufacturer’s latest product certification, which is usually provided by the British Board of Agrément (BBA). With the right specification and
installation, a liquid membrane can not only meet bespoke design requirements, but also ensure a historic building remains watertight for many more years to come.
Project Focus: St. John the Baptist RC Church, Rochdale This Grade II listed building required a comprehensive overhaul of its roof to address issues with leaks. A tapered insulation solution was specified for the first phase which saw the refurbishment of the west transept roof.
The second phase of the church roof’s overhaul saw the building’s east transept roofs refurbished, which required the use of cut-to-falls and ‘lamella’ insulation boards to fit over the barrelled roof sections. A polyester resin-based fully bonded waterproofing system was used for both these phases.
The final phase saw the refurbishment of the central dome roof. After being treated with the solvent free, epoxy-based penetrative primer, a waterproofing system was installed.
Victoria Ramwell is commercial manager from Kemper System UK
WWW.ARCHITECTSDATAFILE.CO.UK
ADF OCTOBER 2023
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