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What is the difference between EPDM and 3 layer built up felt systems?

April 26, 2017built EPDM felt SYSTEMS

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What is the difference between EPDM and 3 layer built up felt systems?

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An EPDM system is a single layer of synthetic rubber, cut to size and then adhered or ballasted to your roof. We guarantee this system for 20 years. A 3 layer built up felt system is layers of bitumen based felt applied using hot bitumen and then covered with granite chippings.