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Modified Bitumen

Modified bitumen membranes are another popular roofing product. This product type pairs the benefits of built-up roofing with the convenience of installation of a single-ply system.

Modified Bitumen Membrane

Common Types

There are two types of modified bitumen – SBS and APP. SBS (Styrene Butadiene Styrene) membranes are typically installed using either hot asphalt or cold adhesives. Some SBS modified membranes are available with self-adhering properties. As a result of safety considerations, self—adhering and cold-applied membranes are becoming more and more popular since they can be installed without having to use an open-flame application method like a specialized welder or torch. APP (Atactic Polypropylene) products are typically installed with a torch or heat-weld method.

Common Applications

Common applications for modified bitumen roofing include conventional and inverted roofs.

Application Method

Modified bitumen roof products can be installed using a number of methods. For instance, it can be installed with the torch, cold adhesive and asphalt methods. The most common SBS modified bitumen roof product is a two-ply system laid down in rolls, with each roll overlapping the edge of the prior roll.


Modified bitumen offers many benefits that make the roofing product highly suitable to commercial/industrial use. It is highly durable, is resistant to weather-related wear and tear, is simple to fix, is available in factory-made rolls that lead to simplified installation and ensure quality control, and is supple enough to allow for adequate contraction and expansion.

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