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A green roof reduces cooling load chiefly through

  • A.reduced thermal mass in the roof construction
  • B.evaporation from the planting and the soil's insulation
  • C.reflection of the incident solar radiation
  • D.increased air movement across the roof surface

Answer: B

Correct answer: evaporation from the planting and the soil's insulation

The soil and vegetation add thermal resistance and store heat, and the water they transpire and evaporate carries away a great deal more as latent heat. Together those keep the roof surface tens of degrees cooler than a dark membrane, and the effect extends to the surrounding air.

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