Project profile: The Quorum in Bristol

By Tremco Roofing.

Learn how Axel Group used the AlphaGuard Bio Liquid Applied Roofing System to refurbish this commercial roofing project.

The roof at The Quorum, a fully occupied and operational office block in Bristol, required refurbishment to improve long-term waterproofing performance. With tenants working on-site throughout the project, the works needed to be delivered with minimal disruption, maintaining safe access and uninterrupted daily operations.

The existing single ply roof system required enhancement rather than full removal, and multiple roof-mounted elements — including plant areas, handrails and pigeon netting — added complexity to sequencing and detailing. Ongoing maintenance access also needed to be clearly defined and protected within the refurbished roof layout.

The plan

An overlay solution was selected to minimise disruption to the occupied building. The AlphaGuard® BIO system was applied over the existing single ply roof, providing a seamless, fully bonded waterproofing layer with enhanced durability. New plant housing was constructed, with all associated roof details formed and fully integrated into the waterproofing system to ensure long-term watertight integrity. Designated walkway routes were installed and clearly demarcated, providing safe access for future maintenance while protecting the roof surface.

Existing handrails and pigeon netting were carefully removed to allow works to proceed and then reinstated following completion of the waterproofing works. Perimeter gutters were fully coated and detailed as part of the roof system, ensuring continuity of waterproofing and improved rainwater management.

The result

The completed works delivered a high-performance, seamless roof system suitable for a live office environment. The AlphaGuard BIO overlay extended the life of the existing roof while improving waterproofing and durability, all without impacting the building’s occupants.

Integrated plant housings, protected walkways, refurbished gutters and reinstated safety features have ensured the roof is both functional and maintainable. The project was successfully completed with minimal disruption, providing The Quorum with a resilient, long-term roofing solution for a fully occupied office block.