One of the most recent changes in the roofing industry is the use of the green roof, also known as a garden roof or vegetative roof. A green roof is a roof of a building that is partially or completely covered with vegetation and soil, or a growing medium, planted over a waterproofing membrane. As energy demands continue to threaten power supplies and smog, cities are encouraging the use of green roofs with incentives such as tax credits.
The benefits of green roofs are numerous and include conserving energy by moderating the temperature on the green roof, dramatically reducing storm runoff volume, and protecting the roofing systems, typically doubling the service life of the roof. Green roofs also increase the impervious ground cover.