● ‘Incorporating green roofs is a bonus when it comes to gaining planning permission, as they are environmentally friendly, combat heat loss and save on energy, as well as increase biodiversity in the ecosystem. All this makes them popular with local planning offices.
● Allow for at least 300kg of weight per square metre, bearing in mind that green roofs must retain moisture in order to live through dry periods, but also be free-draining enough to not overload the structure and flood.
● Drainage is a very important aspect, and designers and builders of green roofs have to follow strict guidelines. These are engineered solutions that aim to mimic natural drainage processes, helping to reduce pollution and localised flooding.’
Sean Butler, Cube 1994