Modified Bitumen Roofing Systems are created when a polymer is added to asphalt to extend temperature limits and increase the pliability of asphalt.
APP Modified Bitumen is developed when asphalt is blended with an atactic polypropylene (a rubber like thermoplastic). APP Modified Bitumen holds up well under UV exposure.
SBS Modified Bitumen is developed when asphalt is blended with styrene butadiene styrene (a rubber like thermoplastic). Surfacing for SBS are more critical than they are for APP as the polymer will break down when exposed to UV over a long period of time. SBS is stickier and granules will adhere better so many SBS cap sheets have a granule surface.
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