Urban development over the last 50 years has led to the paving over of large areas of countryside with cities and supporting infrastructure. In addition, cities are increasingly impervious to water, reducing permeable ground to absorb rainwater run-off leading to potential environmental problems such as flash flooding.
Green roofs retain a very high percentage of rainwater and provide slow, controlled water run-off. They also improve air quality by attracting particles to the vegetation and soil. These Plants also absorb airborne pollutants through the leaves, removing them from the environment.
Green roofs can also improve the acoustics, thermal properties and aesthetic qualities, while also providing additional space for recreational and leisure purposes.
They can significantly increase the life of the waterproofing membrane, protecting it from UV degradation and the extremes of climatic conditions.