The roofs of buildings can be a significant catchment area for stormwater. There is significant volumes of stormwater run off from roofs during high rainfall events. This can contribute to flooding in the areas adjacent to buildings.
Green roofs are able to absorb and hold rainfall for a period of time, slowing down flows and enabling it to be released into the stormwater system in a more controlled manner.
Comprised of special soils and waterproofing systems, they also:
- Significantly reduce heat gain and loss through building roofs which are often the worst performing elements of a building envelope. Thermal comformt is improved in the building, energy costs reduced.
- Help with water quality improvement in removing airborne pollutants that fall with the rain
- Provide amenity for building occupant, and habitat for wildlife