Modified Roofing

Modified Roofing is similar to Built-Up Roofing in that it uses redundant layers of roofing to create a durable weather-resistant surface, but it has one major difference—the bitumen itself.

Asphalt Bitumen is a waterproofing and adhesive all in one. It is created in the oil refining process and has very valuable roofing characteristics. Pliable through most temperatures, and “0 perms”, therefore 100% waterproof. When combined with a substrate like Atactic Polypropylene (APP) or Styrene Butadiene Styrene (SBS), it’s known as Modified Bitumen, which gives it increased low temperature flexibility.

The addition of APP gives roofs a plastic quality, which allows the bitumen to stretch without breaking. Similarly, SBS modified bitumen has a rubber quality that allows it to stretch, and to return to its original size afterwards.

These stretching properties provide extra wear-resistance in extreme weather conditions, and they have made Modified Roofs a popular choice since their introduction in the 1970s. Modified Bitumen is also used in Built-Up Roofs to create hybrid roofing products.

At Kirberg, we set the standard for professionalism and innovation in the roofing industry, and we’ve been doing so since 1920. Call us today at 866-574-2374 to schedule a free consultation and learn more about Modified Roofs and other types of commercial roofing systems.