Columbia Roofing & Sheet Metal in Portland, Ore., has been successful in pitching the green benefits of regular roof maintenance, this article says. The company's recent single-ply retrofit of a commercial building in Oregon helped save the client 25% on energy costs. Meanwhile, extending the lifespan of asphalt roofing keeps petrochemicals out of landfills longer while reducing the strain on roads when such materials are transported, according to president Mark Carpenter.

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