Sustainable Green Roofing for University Physics Building

The installation process began with the careful excavation of the existing earth by the principal contractor, i4 Projects, to expose the original concrete screed and roof deck. Once the substrate was exposed, a new layer of self-levelling compound was applied across the roof, creating a smooth and robust surface critical for the performance of the new waterproofing system.

Garland UK’s approved contractor, Sussex Asphalte Roofing, prepared the deck with Garla-Prime, a high-performance bituminous primer that enhanced adhesion and durability. The Torch Flex VCL membrane was then torch-applied to the surface, providing a secure vapour control layer with expertly sealed 80mm side laps and 100mm end laps to ensure complete watertightness.

To address thermal performance, a combination of flat board and tapered PIR insulation was installed to achieve 0.18 W/m2k, enhancing energy efficiency and aligning with the University’s sustainability goals. The Torch Ultra-Vent Base layer was applied over the insulation as a durable foundation for the final waterproofing.

The top waterproofing layer featured StressPly Flex Plus Anti-Root, an advanced SBS-modified bitumen capsheet. This high-performance material was applied with precision, offering superior tensile strength, flexibility, and resistance to weathering. Together, the multi-layered system provided a durable, long-lasting waterproofing solution designed to meet the unique demands of the building.

The project’s final phase focused on sustainability. To safeguard the waterproofing system from the semi-extensive green roof system, a semi-intensity protection mat was applied, forming a protective barrier. The roof was then completed with Garland UK’s Green Shield Wildflower system, designed to enhance biodiversity, improve air quality, and deliver a visually striking finish. With excellent drainage capacity and various plant options, the system added significant environmental value and further improved the building’s energy efficiency, supporting the university’s commitment to sustainability.

Technical Manager Sam Rigden specified and oversaw the roofing project, which received hands-on support through twice-weekly site visits throughout the work. The proactive management ensured that all stakeholders, including i4 Projects, Gleeds, Studio 4 Architects, and the university, were kept informed via regular progress reports delivered through Garland’s Roof Asset Management Programme (RAMP) system. Reflecting on the project, Sam Rigden commented,

“This refurbishment will significantly impact the university, providing a watertight and energy-efficient building that ensures the protection of vital research equipment while enhancing the overall campus environment. It’s rewarding to know that this work directly supports students and researchers in achieving their academic and scientific goals within a sustainable, modern facility.”

Garland’s collaborative approach, which prioritised close coordination with contractors, architects, and the client, was pivotal in overcoming the project’s unique challenges. This project delivered a watertight, energy-efficient facility that protects vital research while enhancing the wider campus, supporting students, academics, and long-term sustainability goals.

To underscore its commitment to quality and reliability, Garland UK provided the client with an industry-leading Single-Point Guarantee of 25 years + 5 years. This guarantee ensures peace of mind and long-term value, safeguarding the building against future risks and reducing lifecycle costs.