One of the fastest growing green building trends in the U.S. and Canada is the installation of green roofs. That is, systems that use living plant materials as roofing. The idea of green roofs isn't new. The earliest green roofs are thought to date back as far as 500 B.C. However, technological advances are now making the installation of green roof systems practical and affordable for both commercial builders and homeowners alike.
Green roofs can be broken down into two basic types of systems: extensive and intensive systems. Extensive green roof systems are generally designed to be lighter in weight (averaging 10-50 lbs. per square foot), while maximizing building and environmental performance. They typically feature low-lying plants like sedums, mosses, and native grasses, and require only 1-6 inches of soil. Most residential applications are composed of extensive green roof systems.
Intensive systems feature deeper soil designed to support a wider variety of plants. These systems are much heavier (from 80 to more than 120 lbs per square foot) and typically harder to maintain. Intensive systems are typically used in commercial buildings and are designed to be accessed and enjoyed by the public.
Green roofs provide multiple aesthetic, environmental, and financial benefits-to both homeowners and communities.
Aesthetic benefits:
Environmental benefits:
Financial Benefits:
*(listed from the bottom up)
The initial costs for research, design, and materials of a green roof system will vary depending on its size, but you can expect to pay 2 to 3 times more than a conventional roofing system in upfront costs. Additional operation costs also need to be considered, although when the increased life-span of the system and savings from reduced energy costs are factored against overall costs, green roof systems are on par with many of their traditional counterparts.
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About The Author: Ellen Brown is an environmental writer and photographer and the owner of Sustainable Media, an environmental media company that specializes in helping businesses and organizations promote eco-friendly products and services. Contact her on the web at http://www.sustainable-media.com
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Love it! I am trying to talk my dh into this, so your article may well help. Keep up the innovative "green" ideas, please, and check out subterranean housing, permaculture and the like, if you wouldn't mind. Thanks again.
What keeps it from all sliding off during heavy rain or snow?
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