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Modified Bitumen roofing systems are Bargen Incorporated's premier roof system. Unlike conventional built-up roofs, a modified bitumen roofing membran allows ot to be highly elastic. It resists cracking and splitting, and saves weight because no rock is needed ro ballast. Sealed with aluminum coatings, this roof reflects sunlight, making the roof cooler.

Modified Bitumen (MB) is asphalt that has had modifiers added to it to give it plastic or rubber-like properties. The most common types of modifiers being used are APP (Atactic Polypropylene) and SBS (Styrene Butadiene Styrene).

Rolls of modified bitumen membrane come in widths of 36" (0.9 m) to approximately 39" (1 m) and cover an area of approximately 100 square feet to 112 square feet. Surfacings for these roll materials consist of mineral granules, aluminum, copper, or an aggregate such as gravel or slag.

Modified Bitumen roof systems consist of one, two, or three ply systems. The type of substrate will often determine the type of system being installed. Modified membranes can also be installed in conjunction with built-up roof materials (such as multiple plies of fiberglass felt) to form a hybrid roof system. Modifieds have proven performance on residential, commercial, and industrial applications.