Modified bitumen roofing is one of the most common low-slope roofing systems.  Despite the availability of single-ply materials such as EPDM and TPO, modified bitumen remains the ideal choice for certain low-slope building applications.

What is Modified Bitumen Roofing?

Modified bitumen is a modern take on built-up roofing, a traditional material also known as “tar-and-gravel” roofs.  Modified bitumen roofs afford the same levels of protection as built-up roofs.  Despite its similarities to EPDM – in fact, the term “rubber roof” has been used interchangeably for both roof types = modified bitumen is entirely different:  EPDM is made from recycled rubber, while modified bitumen is made from asphalt.

The advantages of Modified Bitumen Roofing:

  1. It’s tear resistant – The main advantage modified bitumen roofing has over commercial roofing systems is that it’s extremely tear-resistant.  Thanks to the combination of fiberglass and/or polyester reinforcement layers  This feature makes modified bitumen roofing the ideal choice for low-slop.
  2. It’s waterproof – Bitumen is inherently waterproof, and several layers of it on a properly-installed roof makes modified bitumen roofs the most waterproof commercial roofing choice available.
  3. It’s energy-efficient – The top layer can be treated to add “cool roof” features such as solar reflectance and thermal emission, or the ability to reflect sunlight, and release already-absorbed heat, respectively  This helps reduce you property’s indoor cooling requirement, resulting in lower energy consumption.
  4. It’s flexible – Flexible low-slope roofing materials are important not just for impact resistance, but also for temperature shifts.  Modified bitumen expands and contracts with our losing its shape.
  5. It’s easy to repair and maintain – In case the roof does tear, repair can be done quickly and efficiently through bitumen patches.  Most instances of low-slope roofing failures occurs at the seals and flashing, but with professional installation and regular roof maintenance, this shouldn’t be a problem.

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