Green Roofs: Calculating the Benefits

by Alison Kibe

The known benefits of green roofs are nothing new; they can reduce building heating and cooling costs, aid in the remediation of the “heat island effect” often observed in cities, and reduce storm run-off. With this in mind, and perhaps putting aside risks and costs associated with green roofs, should I install one? Green Roofs for Healthy Cities, a non-profit industry association for green roof companies, strives to make that an easier question to answer via its Green Roof Energy Calculator (GREC) ( Developed by University of Toronto and Portland State University and funded by The US Green Building Council, GREC estimates annual cost and savings estimates for office and residential buildings with just a few clicks of the mouse. Continue reading