Using Green Roofs to Reduce Heat Islands
2022-09-12
Green roofs have been proven to help reduce heat islands. This page provides a brief overview of the role of green roofs in mitigating the heat island effect, including green roof types, other environmental and social benefits, and cost-benefit considerations.
A green roof, or rooftop garden, is a vegetative layer grown on a rooftop. Green roofs provide shade, remove heat from the air, and reduce temperatures of the roof surface and surrounding air. Using green roofs in cities or other built environments with limited vegetation can moderate the heat island effect, particularly during the day. Green roof temperatures can be 30-40°F lower than those of conventional roofs and can reduce city-wide ambient temperatures by up to 5°F.