IWA Publishing

Green Roof

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Courtesy of IWA Publishing

A green roof, or rooftop garden, is a vegetative layer grown on a rooftop (USEPA, 2010a).  The main tasks of a green roof are retention of rainwater and increasing of evaporation. It can be distinguished between intensive and extensive green roofs. Extensive green roofs have thin layer of soil, the plants are draught tolerant and they require little maintenance. Intensive green roofs have a thick soil layer and are covered by plants such as those you find in a normal garden (e.g. with flowers and trees). This type needs more maintenance and a roof that can bear heavy loads (Scandinavian Green Roof). Green roofs can be applied up to slope of 45°. Tthe local climate and weather have to be considered (inappropriate at very windy places). Typical section of a green roof are (USEP, 2010a):

  • Vegetation
  • Growing medium
  • Filter membrane
  • Drainage layer
  • Root barrier
  • Waterproof membrane
  • Cover board
  • Thermal Insulation
  • Vapour barrier
  • Structural Support

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