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Chicago has more than 7 million total square feet of green roof. In Toronto, large buildings over a certain size are now required to have 60 percent of their roof covered by vegetation, according Greenawnsers.com. Con Edison?EUR??,,????'?????< Green roofs may be extensive, composed of a thin layer of soil where vining or crawling plants grow. Or they may be intensive, involving larger and deeper-rooted plants, trees and shrubs. The best plants choices are those that require little maintenance or water but still insulate the roof from heat and cold. Plants such as thyme, stonecrop, ice plant, and sedum are recommended by experts. Working on a roof is much different than working on the ground and the risks are significantly greater from a safety and construction standpoint. ?EUR??,,????'?????< Depending on the job, the profit margin for a green roof is at least equal to what a landscape contractor can expect for a good residential or commercial project, Grothe says. The profit margin is good because the job requires risk and expertise and currently there is a barrier to entering the market. After installation, there?EUR??,,????'?????< |
