GRACC can be considered as a reasonably successful project having developed the first UK specific code of best practice for green roofs, together with supporting documents, and demonstrated effective engagement of a national body representing the roofing industry. The project’s work should support the use of green roofs which can be expected to reduce flash flood events. However, the project was unable to complete the development of a Supplementary Planning Document for local authorities or a pan-European green roof code for reasons largely out of its control.

The project successfully developed a UK-specific Code for Green Roofs. The Code sets out minimum standards for the specification of green roofs that will help to address climate change. It specifies that the depth of substrate material used should be at least 80mm. This is essential to ensure sufficient water retention to help reduce temperatures in urban environments, reduce the heating and cooling needs of buildings and provide increased biodiversity value.

The project worked successfully to engage the key stakeholders – particularly the roof contracting industry, but also local authorities and other government agencies - effectively in the elaboration of the Code. This should improve longer term acceptance and use of the Code and also helped raise awareness of the Code and green roofs more generally.