Pavilion of Armenonville
April 6, 2020
Hørsholm Library
April 6, 2020

Water treatment plant

95 million litres per day

The coastline from Brighton to Peacehaven is one of the most beautiful of England. But the beautiful nature hid an ecological problem. The waste water of the surrounding areas did not receive any treatment before being discharged into the sea. This meant that the European standards for sewage water were not followed on this site in Sussex. Luckily things are changing now. A new installation that can treat 95 million litres sewage water per day is planned.

The largest green roof dome in England

The design phase took 10 years and it were in the end the sustainable waterproofing and the green roof that helped in obtaining the building permit. Because of the green roof, the installation is optimally integrated into the rural environment, a must for this project. The works started in 2009 in Sussex and the roof was finished in May 2011. The whole installation became operational in the spring of 2013. The roof is over 17.000 m² and is curved. A real challenge for any roofer. The build-up of the roof was designed by Alumasc, the Derbigum-partner in England, together with an approved contractor. On the steel deck, a primer and a self-adhesive layer were applied. On this came the glass wool insulation and, bonded with Derbibond NT, some 16.000 m² of Derbigum AR anti-root membrane was applied in single ply.

Anti-slip upstands

For this project, anti-slip upstands were made for some areas in order to prevent the green roof from sliding on the steep slope.

Project and contractor are rewarded

Paul Webb, Project Manager of roofing company Prater, relates: “The Derbigum system complied with the demands for waterproofing and offered the most effective base for the green roof. The challenge was to get the 16.000 m² anti-root roofing and all the other material for the green roof onto the roof without producing a too large ecological footprint. We always took into consideration the environmental impact, that is why we choose for sustainable and recyclable materials.”

As a result of this project, the roofer Prater was rewarded with the “Costain Blue” prize for contractors. They are also nominated for the “Contractor of the Year Awards”.
16 000 m2
Peacehaven, Essex, UK
Green roof,