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Use an eco-roof for less pollution, improved insulation (Eco news)


Use an eco-roof for less pollution, improved insulation
Lakenewsonline.com reported

Instead of tar or asphalt, an eco-roof has a thin layer of soil and plants, says Greg Haines of Portland, Ore., who has been installing eco-roofs for several years. With a traditional roofing system, rainwater washes off rooftops and onto driving surfaces, eventually mixing with antifreeze and oil before it ends up in the sewer system. On an eco-roof, rainwater is absorbed into a vegetative roofing system, filtering out air pollutants and making cleaner water.

How it works

How an eco-roof works is simple. Rain falls on an eco-roof. The rainwater is absorbed through a layer of soil, then a layer of spongy material and carpet padding. The plants on the eco-roof grow, helping filter the air, providing habitat and food for wildlife and insulating the structure underneath.

“The plants are up taking the water. It’s evaporating naturally, and it’s being returned to the natural hydrologic cycle rather than becoming a waste product that the sewage treatment plant has to deal with,” says Haines.

When just an inch of rain falls, the eco-roof should absorb most of the rainwater. In a heavier storm, the eco-roof softens the impact of the heavy volume of rain, and water runoff is lessened in comparison to a traditional roof.

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