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We have a Green Roof

The Nancy C. Sawin Math/Science Center building has sported a “green roof” since 2007—the first for a Delaware school.  

The sedum bedecking the flat roof:
  • Saves energy by keeping the building cooler in the summer.
  • Reduces the urban “heat island” effect.
  • Slows the natural deterioration of the roof by protecting it from UV radiation and temperature-related expansion and contraction.
  • Filters pollutants from rainwater and air.
  • Reduces by 50–60% the volume and speed of erosion-causing runoff.
  • Reduces the “silting in” of Cab Calloway Pond adjacent to the building, making it more hospitable for a variety of beneficial plants, animals, aquatic life, and organisms.
  • Contributed to a 10% energy savings in the roof’s first year alone.
  • Provides a hands-on learning opportunity for students of all ages in a variety of disciplines, from biology and physics to civil engineering, economics, and environmental science.

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