ABG blueroof - Green Extensive & Paved Areas, Grosvenor House, 1 Wellington Street, Sheffield, UK

The new six storey HSBC building at No.1 Charter Square in Sheffield utilises ABG’s blueroof system to meet the National Planning Policy Framework and the site's Flood Risk Management Policy. Attenuation for the building is provided at roof and street level, comprising void formers constructed within the roof and streel level structures to temporarily attenuate storm water, before gradually releasing it over a number of hours via the ABG restrictor chambers.

At street level the system was installed underneath the surrounding walkways and access routes to restrict discharge rates at ground level, including a large landscaped podium deck area above a service yard where heavy duty void formers were used in the event emergency vehicle access is required.