What The Heck is a Blue Roof?

An article in the September technology issue of Building Operating Management explains 8 technology developments shaping high-performance exteriors. Many of these may be familiar to facility managers - weather-resistant barriers, cool roofs, and new glazings technology. But the authors also describe something called a blue roof, a concept I hadn't been familiar with before. A blue roof is a new kind of roof that "attenuates peak stormwater flow from the roof to accommodate the limited capacity of an existing antiquated infrastructure." Basically, the idea is to minimize stormwater run-off, saving both the facility money and helping protect a community's increasingly fragile sewer systems. 

Have you heard of blue roofs? Used one? What do you see as the advantages? 

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