How does a green roof help in terms of energy efficiency and insulation?
Temperatures on the roof surface have an effect on the indoor building temperature; in turn, this contributes to the amount of energy required to heat or cool the building. The additional vegetation layer over the roof acts as a buffer between indoor and outdoor temperatures. As well, during summer months Plants will transform heat and soil moisture into humidity which in turn cools the surrounding environment, including the building. During cooler months, the buffering capacity of the green roof provides insulation against heat loss through the building roof. Accredited thermally insulating drainage layers add to the insulating capacity of the green roof and therefore, help maximize insulation benefits.* By reducing temperature fluctuations within the building, less energy and less cost is required for temperature regulation.
