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What are Green Roofs?

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Green roofs as a combination of natural and artificial facility has many positive and negative aspects. By knowing properly about the positive and negative aspects, it gets easier for facility managers to plan and maintain the service according to space, infrastructure, people and organization. Carter and Butler (2008), studied the ecological impact of green roofs on test plots of Georgia and Massachusetts. It was evaluated that green roofs help in storm-water retention by retaining 78% of rainfall. They also help in improving building energy and managing the temperature according to the surrounding temperature. Approximately 2.5% of cooling load reduction and 0.5% of heating load reduction are provided by the presence of green roofs. Similar kind of study was done on the urban ecosystems of green roofs, examining the biotic and abiotic components that contributes to overall ecological systems (Oberndorfer, Lundholm, Bass, Coffman, Doshi, 2007). Though green roofs are beneficial in water retention and varying the roof temperature according to the surrounding temperature, it highly depends for these attributes on its design (Simmons, Gardiner, Windhager, 2008). A case study on Fencing Academy of Philadelphia was conducted by United States EPA Office of Water (2000) to measure the benefits of vegetated roof cover. The project showed that the vegetated roof cover helps to reduce the peak runoff rates for the storm events and helps in extending the roof life by 20 years or more.
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