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Where To Buy Modified Bitumen Roofing

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Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or "flat" roof structures. Engineered modified bitumen roofing membranes originated in Europe in the mid 1960's and have been used successfully in the United States and Canada since approximately 1975. Modified Bitumen Roofing Systems are designed to withstand harsh exposure to extreme environmental elements. With five layers of protection, it's one of the most trusted flat roofing systems used in the industry today.

Over the past 50 years or so, modified bitumen roofing has evolved from being an experimental innovation to one of the most common commercial roofing systems in the industry. Its tensile strength, durability, and relative ease of installation have made it the roofing material of choice for millions of projects worldwide. But what, exactly, is modified bitumen roofing, and what makes it superior to other roofing types

Modified bitumen is thought of as the evolutionary cousin of the built-up roofing systems (BUR) that have been used on low-slope roofs for more than 100 years. It is made of asphalt combined with polymerized rubber or plastic, then reinforced with fiberglass to create a rugged-yet-flexible waterproof membrane.

Modified bitumen roofing is primarily used on flat or low-slope commercial roofs. Depending on the type and material, these membranes may be installed as part of a two-layer system or as part of a multi-ply system.

Modified bitumen first appeared in commercial roofing in the mid-1960s in Europe. Before that time, the conventional roofing system used on most commercial structures was built-up roofing (BUR), a complicated system of alternating layers of asphalt and fabric with a top layer of gravel.

While BUR was a tried-and-true method, it was heavy, costly to install, difficult to repair, and often had trouble holding up against extreme temperatures. By integrating the bitumen with polymers and fiberglass into a simple membrane, the developers of modified bitumen hoped to simplify the roofing process while resolving some of the most common issues with BUR.

Overall, the efforts were successful. Modified bitumen proved to be easier to install while providing enhanced protection compared to BUR systems, even in very cold temperatures. By 1975, modified bitumen was in wide use here in the United States, and today, it has all but replaced BUR as one of the most reliable roofing materials on the market.

Some modified bitumen membranes may also be mechanically attached. Most applications call for at least two layers (a base layer and a cap layer), but in some cases, it may be installed in a multi-ply system of three or more layers.

Polyglass offers a wide range of high-quality modified bitumen roofing products for a wide range of applications. Browse our modified bitumen products, and be sure to sign up for our newsletter below for even more helpful roofing information and resources.

From the very beginning, Polyglass has led the industry in the development of high-quality modified bitumen roofing. That legacy continues today as we offer a large selection of modified bitumen roofing products and accessories designed to accommodate a wide range of commercial and residential roofing applications.

Polyglass provides a broad range of base, interply, and cap APP modified bitumen roofing membranes constructed with premium Atactic Polypropylene resins. Superior polyester and/or fiberglass reinforcing are incorporated to offer exceptional tensile strength, puncture resistance, and flexibility.

Unlike single ply membranes such as EDPM, TPO, and PVC, modified Bitumen multi-ply systems provide several layers of defense. When properly installed, modified bitumen membranes have a stable thickness throughout its life, while single-ply membranes have annual thickness loss due to weathering.

Polyglass is an ISO 9001:2015 Certified, leading manufacturer of modified bitumen roofing and


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