There are two general types of polymer modified bitumen membrane roofing systems, atactic polypropylene (APP) and styrene butadiene styrene (SBS). These polymer modified membranes differ in chemical characteristics. Both modified bitumen membrane types are thick, heavyweight membranes that are reinforced with either polyester, fiberglass or a combination of both. Modified bitumen membranes commonly come with a factory applied mineral, granule surface or an approved coating which is applied after the product is installed.
Modified bitumen roofing systems offer the redundancy of built-up roofing with the added strength, flexibility and UV resistance of a modified bitumen membrane. Installation of modified bitumen is generally by cold adhesive, self adhered, heat fusion, hot asphalt or mechanically attached.
Advantages of modified bitumen roofing are:
Compatibility to solve rooftop challenges
Tough, durable roof
High resistance to roof top traffic
High puncture and tear resistance
Variety of application
Easily installed and maintained