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Why is a UK code required? The German FLL guidelines, widely perceived to set the highest standards for green roofs, have long been followed and cited by the quality green roof manufacturers that are operating in the UK market. However, there are important differences between Germany and the UK, notably in terms of the climate and the drivers for green roof installations:


•Climate: The UK’s unique weather patterns have important implications for the green roof build-up, particularly in terms of the planting that can survive (and the subsequent effect upon the substrate and drainage layer to provide the planting with the appropriate air, water and nutrients.


•Drivers: In Germany, there are numerous incentives and local legislations driving green roof installations to derive the communal benefits of green roofs, notably stormwater management. The sustainable drainage potential of green roofs is also a key driver for UK green roof specifications. However, the second of the primary specification objectives for UK green roofs is the re- creation or enhancement of habitat lost during the urbanisation process to improve biodiversity. This is an important issue in the UK due to the smaller land mass and highly concentrated population within urban areas; less so in Germany, where the greater land mass permits biodiversity to be managed more easily at ground level.


The Code’s Mission The Code is a clear concise guide that aims to:


• Provide specifiers and installers with the requisite understanding of the key issues that affect the design, installation and maintenance of high quality, flourishing green roofs for the long term;


• Highlight the implications of different green roof specifications, notably in respect of the design, in-life performance and long-term maintenance requirements;


• Standardise and clarify the terminology used to describe green roof issues and components through the publication of definitions for key terms;


• Enable specifiers to comparatively assess the different manufacturers’ systems through the provision of guidance as to the function


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and relevant performance characteristics of each component within the build-up;


• Guarantee a minimum quality standard for systems that comply with the requirements of the Code;


• Promote the benefits of green roofs and highlight how different green roof build-ups can be tailored to prioritise specific objectives;


• Highlight important health and safety issues that must be reflected at the early design stages of a project;


• Encourage green roof installers to undergo specialist, structured training courses to gain the expertise that will underpin greater numbers of quality green roof installations;


• Provide for the long-term success of green roof installations by encouraging entry into maintenance contracts with the installing contractor;


• Provide a foundation upon which further iterative developments can, in time, be based; leading to green roof guidelines that are as comprehensive as any available, including the publication of standard procedures for the characterisation of components and of required performance levels, so as to underpin the continuous improvement of green roofs in the UK.


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