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What is blue roofing?

Green roofing has become a pretty common term these days. Adding a layer of plants to your roof instead of shingles or single-ply has a variety of advantages – insulation, reduced water runoff, mediating the urban heat island effect, growing fruits and vegetables — well, you get the idea.

So what exactly is a blue roof?  A blue roof has a series of ponds/tanks and temporarily stores rainwater. Once the rain has stopped, the ponds or tanks slowly release the water. In short, it mimics the hydrology of the site before the building was place there.

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Photo Source: Hazen & Sawyer

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