Facility managers consider green roof system to be environmentally preferable, lasts for longer time and also saves energy for the facility. Green roof system has originated centuries ago in places of Europe where there is no material available for constructing the roof. It is essential to understand the issues such as cost of installing green roof, short and long term maintenance of the green roof by hospital and school administrators, before installing a green roof system.
The significant benefit of green roof system is stormwater management. It effectively addresses the problem of stormwater as the rooftops of the buildings gather pollutants, bacteria and other contaminants. The U.S Environmental Protection Agency estimates that after every one-half inch of precipitation, minimum 75 percent is absorbed by green roof after a rainfall.
Green roof plays a major role in energy conservation. The precipitation absorbed by green roof after every rainfall is released into the atmosphere slowly. Green roofs help to protect the roof from temperature extremes that causes the roof to wear and crack.
The roofs are designed that last for twenty years, however, the installation and replacement can be very costly and disruptive for building users.
Green roof systems provide a habitat for wild life, reduce energy costs and extend life of existing roofs.
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