The survey asked member-companies to report on their completed 2004 and 2005 green roof projects in North America. Results indicate a 72 percent growth in green roof square footage across North America between 2004 and 2005, and over 80 percent growth in the United States. North American green roof infrastructure implementation increased from 1.3 million square feet in 2004 to 2.5 million square feet in 2005.

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Green roof infrastructure (a.k.a. eco-roofs and vegetated roofs) involve the use of technologies that incorporate drainage systems, high quality waterproofing, a root-repellant layer, light-weight growing media and specially selected plants onto the roofs of buildings

The top ten cities by square footage planted in 2005 are as follows:

• Chicago, IL
• Washington DC
• Suitland, MD
• Ashburn, VA
• New York, NY
• Culpepper, VA
• Austin, TX
• Arlington, VA
• Des Moines, IA
• Ottawa, ON.