Although green roofs have only existed in the United States for about a decade and expertise with green roof applications is sometimes hard to find, one thing remains understood: waterproofing is the most important and critical element of the system.
Commonplace in European countries such as Germany, and gaining popularity in major U.S. cities, green roofs have expanded construction opportunities to other areas of the country. They are being used more frequently because of their long-term integrity and their ability to minimize storm water drainage and the effects of urban heat islands.