Online program computes energy savings from green roofs; compares savings with other options

A free online tool can calculate the amount of energy savings from installation of a green roof. Portland State University‘s (PSU’s) online Green Roof Energy Calculator can be used for new or old structures. The user inputs the depth of the growing medium and percentage of roof to be covered. Energy usage can be compared with dark and white roof options. Questions about green roofs can also be posted on the web site and answered by the team managing the tool.

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