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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.

Benefits

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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