Built-Up and Modified Bitumen Membranes

Bituminous roofing membranes represent a major portion of today's roofing and have a strong record of reliability. JM offers over 150 years of experience with these systems. There are two major types of bituminous roofing systems.

Built-Up Roofing Membranes (BUR)

With BUR roofing systems, the waterproof membrane is field-fabricated with layers of bitumen alternating with plies of reinforcing felts and appropriate protective surfacing. The reliability of BUR is enhanced by the redundancy of the plied-in layers of roofing felts.

Modified Bitumen Membranes

By modifying premium-grade asphalts, JM has developed formulations that enhance the asphalt's overall weatherability. By combining these modified asphalts with nonwoven polyester or fiber glass reinforcements, JM produces waterproofing systems that exhibit tremendous strength, elasticity and weatherability. The systems feature either SBS or APP membranes.

Optimize performance with Invinsa™ roof board

Invinsa™ Roof Board is an integral component in a Johns Manville single ply roof system, as well as in cold-applied and self-adhered bituminous roofing systems. This lightweight board optimizes the long term performance and longevity of the roof. Its reduced weight provides labor and installation savings, including easy hoisting and maneuvering around the roof. Easy scoring and cutting allow for tight fabrications around roof penetrations.