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Modified Bitumen Roof is a roofing system that uses ashpalt to replace plasticizers removed during the distillation process. Bitumen is reinforced with fiberglass and polyester fiber matting which helps maximize its strength and durability. SBS and APP are the two most common types. The use of SBS (styrene-butadiene-styrene) increases the flexibility of the membrane and allows it to have stronger expansion and contraction capabilities. APP (attactic polypropylene) increases the aging ability of the roof system. SBS is often the more popular system since it increases the roof flexibility.