By landscaping your roof you can insulate your house, purify rainwater, cool the air, generate oxygen, restore habitat for native critters, and double the lifetime of the roof. If a sufficient total acreage of roofs is planted in a city, the urban heat-island effect of a city center can be mitigated.
Intensive green roofs are installed on commercial buildings and have a soil depth of one foot or more. Extensive green roofs for residential buildings landscape soil that is only 1 to 5 inches deep. Another
According to an article in San Diego Magazine , carefully selecting native plants can yield a roof that is lightweight, hardy, drought-tolerant, and shallow. San Diego-based Building Green Futures is featured in the article. Chicago's City Hall has been green since 2001.
More information is available at www.greenroofs.com and www.greenroofs.org.
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