Green roofs are an excellent way to reduce stormwater runoff because they soak up a significant amount of rain, reducing the amount of stormwater discharge from a residence. Researchers at North Carolina State University have found that a 3 inch green roof can retain approximately 6/10 of an inch of rain for each rainfall event, even when storms come on consecutive days. The Center for Green Roof Research at Penn State University reports that a 4 inch green roof can retain 50 percent of total rainfall over a series of storm events.
Why Green Your Roof?
- They are beautiful and can add value to your property.
- Buildings with green roofs are warmer in the winter and cooler in the summer, reducing heating and cooling costs.
- They reduce the “heat island” effect.
- They absorb more noise pollution than standard buildings.
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