Green roofs have been in use for many years in Europe. Traditional green roofs, so called intensive green roofs, were composed of a thick sod layer, plants and trees, and required extra structural support. An alternative green roof, called an extensive green roof, is the most common type of green roof being installed. The extensive green roof uses a thinner, lighter, growing medium, and is planted with low growing, drought tolerant plant species such as Sedum. In most cases, the extensive roofs do not require extensive structural support, yet still provide a stormwater benefit. Research at UConn has shown that around 51% of rainfall can be retained by an extensive green roof. There are additional benefits including increased insulation capabilities, which can result in lower heating/cooling costs. In addition, an attractive, functional space can be created in locations where space is often at a premium.
More information about green roofs can be found at www.greenroofs.com.
Funded in part by the Connecticut Department of Energy and Environmental Protection through a
United States Environmental Protection Agency Clean Water Act Section 319 Nonpoint Source Grant.