CASE STUDY DECEMBER 2012 Peacehaven Wastewater Treatment Works Case Study FACT FILE Location Peacehaven, Sussex, UK Year 2011 Architect Montgomery Watson Harza Contractor 4Delivery (a consortium of Costain, Veolia Water and MHW) Envelope constructor Prater Ltd Waterproofing specialist Alumasc The challenge The purpose of Southern Water’s £300 million environmental improvement scheme is to treat 95 million litres of waste water a day. Part of the scheme, the Peacehaven Wastewater Treatment Works was to feature a grassy roof expanse, concealing the various buildings underneath and enabling them to blend into the rolling hills surrounding the site. Creating the curvaceous profile and cantilevered construction of the 17.800m2 green roof was fundamental to the project success. As well as being sympathetic to the landscape, the grasscovering would enhance the site’s biodiversity by providing a habitat for downland plant species and creating a secure environment for nesting birds. It also needed to attenuate rainwater run-off and offer excellent thermal insulation.

CASE STUDY DECEMBER 2012 Benefits 17,800 m2 green roof construction – the largest in the UK Part of Southern Water’s £300 million environmental improvement scheme Habitat for downland plant species and nesting birds ROCKWOOL® products save more than 100 times the energy invested in manufacture, transport and ultimate disposal ROCKWOOL® solution The sustainable roof construction is a warm flat roof system that utilises the ROCKWOOL® 85mm HARDROCK® Dual Density range of tissue faced insulated roofing boards. These feature a robust, high density top layer with excellent point load compressive resistance...