"An article by Amy Kraft posted on Salon that originally appeared on Scientific American claims that urban roof gardens have been performing below expectations. These roof gardens were supposed to cut energy usage and minimize rainwater runoff, but the results of several studies were mixed and not as favorably expected. However, research on how to maximize the benefits of green roofs continues to this day in various cities of the globe like New York. In fact, on a rooftop in New York City's Chelsea neighborhood, two students are collecting soil samples from boxes planted with two native species. They place the dirt from the soil into a plastic bag to be taken for analysis in the laboratory. It shows homeowners that choosing the right materials to install on their roof, whether from New York or Toronto roofing companies, is a process that must be carefully considered."
http://www.walkercontracting.ca/industry-news/choosing-the-right-materials-from-roofing-companies-in-toronto/
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