Green Roof Overvew 
For Electric & Natural Gas Customers

A green roof can help lower a building's energy costs by reducing the rooftop surface temperature and minimizing heating and cooling losses from a building. Green roofs help combat the urban heat island effect by soaking up some of the sun’s radiation on hot summer days and can reduce storm water runoff. The installation and design costs of a green roof, however, may a downside because they may require modifications to a building in order to sustain the additional weight load of the green roof design. Additionally, any future maintenance or repairs involving the roof structure may make it difficult to access.
Green roofs typically contain the following:
  • Vegetation
  • Growing medium (soil)
  • Waterproof roof membrane
  • Root barrier
  • Irrigation system

Green roofs are categorized by the level of necessary maintenance and the depth of medium required by the vegetation which affect the overall weight load on the building structure. Green roofs that require a higher amount of maintenance are labeled intensive, while those extensive roofs, those designed with lighter vegetation, tend to be more self-sustaining.
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