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How heavy are green roofs? Could my roof support the weight?

April 26, 2017heavy roof roofs support weight

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How heavy are green roofs? Could my roof support the weight?

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The weight of a green roof depends on how deep and what type of soil is used. Some lightweight systems can weigh as little as eight to ten pounds per square foot fully saturated with water, while more typical green roofs with four inches of soil weigh between 25 to 40 pounds per square foot. Most row house roofs in Philadelphia can support an additional fifteen pounds of green roof material per square foot in addition to a heavy snow load, but having your roof double-checked by an engineer and at very least a roofing professional familiar with evaluating structural integrity is highly recommended.