In the past 50 years, modified bitumen roofing has gone from an innovative concept to one of the most popularĀ industrial roofing systems.

Its ability to stretch, its durability, and the fact that it is easy to install has made it the roofing material of choice for millions of projects worldwide.

This article will cover what modified bitumen roofing is, the different types of modified bitumen available, and answer many other frequently asked questions about this topic.

What Is Modified Bitumen Roofing?

Some people think of modified bitumen as the evolutionary cousin of built-up roofing systems (BURs), which have been used on low-slope roofs for over a hundred years.

Asphalt is combined with polymerized rubber or plastic to create a rugged, flexible waterproof membrane that is then reinforced with fiberglass.

Modified bitumen roofing membranes are commonly used on flat or low-slope commercial roofs. It depends on the type and material; these membranes may be installed as part of a two-layer or multi-ply system.

Application Methods for Modified Bitumen

Modified bitumen typically comes in the form of a membrane installed directly onto the substrate using an adhesive.

The material can be welded with heat, glued on cold, or adhere to surfaces by itself (like many of Polyglass’ top products that feature ADESO® self-adhering technology).

Some modified bitumen membranes come with the option to be mechanically attached. Usually, two layers are applied (a base and a top layer). Still, sometimes three or more may be necessary for the project.

Modified Bitumen Membrane Types

There are two common types of modified bitumen: APP and SBS.

APP Membranes

APP, commonly nicknamed “plastic asphalt” membranes, consists of blending elasticized plastic polymers with asphalt that becomes resistant to high temperatures under UV rays. It’s a good choice for structures seeking a cooling effect on their roof.

SBS Membranes

This membrane type is created by combining asphalt with polymerized rubber to produce natural flexibility and elasticity.

SBS is an ideal type of roofing for buildings in areas with significant temperature changes and high winds.

The benefits of Modified Bitumen Roofing

  1. Tear-resistance: Modified bitumen is not only resistant to tears from different types of weathering and debris but also provides excellent durability and tensile strength against consistent foot traffic.
  2. Waterproof: Modified bitumen installed properly provides some of the best waterproofing available on the market, and redundant layers enhance this quality.
  3. Ease of installation, repair, and maintenance: If it does get a hole or crack, all you need is a quick patch.
  4. Flexibility: Modified bitumen changes with weather conditions while maintaining stability.
  5. Energy-efficient: Some forms of modified bitumen are resistant to UV rays and can reflect sunlight, meaning lower energy costs for you.

Get Your Commercial Roofing up and Running With Our Service

At Walton Contractors, we’re the best in modified bitumen roofing. If you need a reliable contractor who can help with your next industrial roofing project, be sure to reach out to us.

We would be happy to discuss your needs and provide a quote for our services.

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