Originally opened in 1972, the University of Sussex's Accelerator Building was constructed into the hillside of the physics complex to house a three-million-volt Van de Graaf Accelerator. Today, the building supports leading research in physics and material sciences. To future-proof the facility, a high-performance roofing system was required, delivering watertight protection, improved thermal efficiency, and alignment with the university’s long-term sustainability targets.
Addressing Complex ChallengesThe University of Sussex and building surveyors Gleeds appointed Garland UK Technical Manager Sam Rigden to design and deliver a roofing solution that enhanced waterproofing and energy performance as part of the university’s net zero action plan.
A comprehensive roof survey revealed multiple active leaks, threatening the valuable research equipment below. The complexity was heightened by the original structure being buried under two metres of soil, requiring careful excavation to avoid structural compromise or disruption to sensitive equipment.
A key aspect of the brief was to integrate a sustainable green roofing system to improve biodiversity, air quality, and energy efficiency. Achieving this demanded careful material selection and close coordination between stakeholders to ensure seamless integration with the existing infrastructure, all while meeting stringent sustainability and performance standards.
Sustainable, Long-Term Roofing SolutionPrincipal contractor i4 Projects carried out the delicate excavation to expose the original concrete screed and roof deck. A self-levelling compound was applied to establish a robust, uniform base, essential for the optimal performance of the new StressPly Flex Plus bituminous membrane waterproofing system.
To meet thermal requirements, flat board and tapered PIR insulation were installed, achieving a U-value of 0.18 W/m²K. The build-up was completed with Garland UK’s Green Shield Wildflower system, a semi-extensive green roof designed to enhance biodiversity, support stormwater drainage, and deliver a visually striking finish. This final layer significantly improved the building’s environmental credentials in line with the university’s sustainability strategy.
Garland UK ensured full visibility throughout the project lifecycle by providing twice-weekly inspections and real-time reporting through the Roof Asset Management Programme (RAMP). This collaborative, service-led approach enabled smooth coordination with i4 Projects, Studio 4 Architects, Gleeds, and university stakeholders.
Technical Manager Sam Rigden commented, “This refurbishment significantly enhances the building’s energy efficiency and ensures the protection of cutting-edge research. It’s a privilege to support an environment that enables students and researchers to excel in a safe, modern, and sustainable space.”
Lasting Results Backed by GuaranteeTo ensure peace of mind, Garland UK issued its market-leading 25+5 year Single-Point Guarantee, covering design, materials, and installation. This eliminates the risk of split liability between manufacturer and contractor, offering one point of contact and a fully accountable solution that reduces lifecycle costs and ensures building performance for decades to come.
