RSI: Evaluating Ballasted Single-Ply Roof Systems

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“Stone-ballasted membranes constitute about 10 percent of all newly constructed built-up and single-ply roofing systems, and many older systems continue to perform well in the low-slope roofing market. Unfortunately, in their zeal some structural engineers have confused the smaller and lighter pea gravel used on built-up roofs (BURs) for fire and weather protection with the large size stones used as ballast on some single-ply roofing membranes.”

Author: Michael Russo

Source: RSI