ABSTRACT
Beyond the aesthetic benefits a well-designed and maintained green roof can bring, green roofs have a role to play in supporting green infrastructure initiatives, mitigating the impacts of climate change, and boosting urban resilience. The planning, implementation, and maintenance of the three main categories of green roof – intensive, semi-intensive, and extensive – are covered in the UK Green Roof Code of Practice, the GRO code. Biodiverse substrate Extensive substrate required as growing medium. All companies specializing in waterproof membranes for green roofs have purpose-designed integrated systems for roof drainage and can offer design advice on the number of outlets and sizes proposed based on various factors: area of green roof, local rainfall intensity and building life and safety factors. There should always be a minimum of two outlets, or one outlet and one overflow, for safety reasons.
