Architectural charm often lies in the diversity of the roofs found in older properties. Flat roofs contribute to the character of historic buildings, and require specialist materials and workmanship to maintain their integrity.
Specifiers and contractors may not immediately consider liquid-applied membranes for heritage refurbishment. Yet, there are many advantages for using this technology.
Going Green with Liquid Waterproofing
Liquid-applied membranes can offer the advantage of being manufactured in bespoke colours, making them ideal for heritage projects featuring aged copper roofs. Over time, the weathering process and exposure to moisture transform copper metal into a distinctive light green colour known as “patina.” By mixing different pigments during the manufacturing process, a liquid can be matched to patina roofs, providing the exact shade of green necessary to achieve a consistent colour for both refurbishments and extensions.
An Alternative to Lead
Liquid technology offers a viable alternative to lead, providing a more cost-effective solution while mitigating the risk of theft. Liquids can be used to waterproof entire roofs or for smaller, more specific design requirements. For instance, during a project of ours of the refurbishment of North Western Hall in Liverpool, architects specified Kemperol to waterproof 40 chimneys that encircled the Grade II listed building and its slate roof. The architects aimed to achieve a lead-like appearance, and thanks to a specialised installation process, combined with the seamless grey Kemperol membrane; it successfully achieved the desired aesthetics.
Important Considerations for Specification
When it comes to any roof refurbishment or renovation, it is crucial to correctly specify and install a liquid membrane for a heritage project to ensure it performs to the required standard and protects historic buildings for the long term. With numerous liquid roofing products available, specifiers must thoroughly research which one is most suitable for the application.
Compliance with building regulations and, in some cases, the requirements of organisations like Historic England, is essential. Other important considerations include fire resistance, compatibility with the surfaces to be waterproofed, ability to withstand substrate movement, and resistance to damage from anticipated load levels or trafficking.
At Kemper System, our solutions have independent product accreditation including British Board of Agrément (BBA), which is used to establish conformity and suitability.
With the right specification and installation, a liquid membrane can not only meet bespoke design requirements but also ensure that historic buildings remain watertight for many more years to come, by preserving the character and integrity of heritage properties while embracing modern technology.