St George’s tree-canopy design transforms sports facilities

AN inspiring sports facility, featuring a striking Sika Sarnafil single ply membrane roof, has been built at St. George's Weybridge

The exciting architectural development was built as part of the establishment’s 150th anniversary celebrations and includes a premiership level hockey pitch and six-court sports hall, as well as a strength and conditioning suite, dance studio and flexible multi-use areas. 


Transforming the existing, functionally simple sports hall, this now beautifully designed facility has a tree canopy-like roof structure draping over the building’s internal spaces. 


Designed by global architectural practice Scott Brownrigg, the roof needed to achieve 30m clear spans across the main hall and the design needed to be clever and sensitive to the fact that the site’s location sits within the green belt. It also required a flexible and durable waterproofing solution to ensure the building leaves a lasting legacy for future generations of Georgians. 


The design features a bespoke freeform glulam roof that curves in multiple directions. Computer modelling software allowed the architects to create and control this complex roof form in virtual reality, pushing and pulling it to blend into the landscape. 

Needing a roofing product that was elegant and pliable enough to accommodate the complex design, lightweight enough to minimise the impact on the roof’s structure and cost effective enough to cover such a large area, Sarnafil G410-ELF lead grey single ply membrane was specified, along with Sarnavap 5000, 120m SarnaTherm G insultation board and Sika SolarMount-1. Sarnafil adhered décor profiles were also installed, allowing rainfall to be interrupted and guided across the roof. 


Sarnafil worked closely with the architects and contractors to develop a specification that not only had the correct U-value, but was also compatible with the Cross Laminated Timber roof build-up and ancillary roof mounted systems used, such as Photovoltaics, Latchways, a built-in gutter and upstands for roof openings. 


Roofing contractor Malone Roofing was tasked with realising the architect’s roof design. With both Malone and Scott Brownrigg having specified Sarnafil in the past, the entire team were confident that Sarnafil single ply was the right fit for this unique roof form. 


Malone Roofing spent a combined total of 12 weeks on the project. Despite being faced with a particularly rainy period and a challenging design, with curves sloping up to 30 degrees in some areas, they were able to complete the roof on time and to budget. 


The architect’s vision was to create a contemporary building that would inspire students to achieve their very best. Thanks to an exceptional design, impeccable installation and Sika’s robust roofing guarantees, the team was able to achieve just that, while also ensuring this timeless design will be protected and enjoyed for years to come.


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