If you are looking for high-quality modified roofing near you, check with the professionals at Union Roofing. We are experts in modified bitumen and built-up roofing, with over 40 years of experience installing, repairing, restoring, and maintaining roofs of all sizes.
Modified bitumen roofing and built-up roofing (BUR) are popular choices for low-slope or flat roofs, such as those found on many commercial properties.
While each roofing material has its advantages, it can be helpful to know the differences.
Modified Bitumen Roofing
Modified bitumen is typically sold as a membrane, in rolls that contractors can install directly onto the substrate.
Generally speaking, a modified bitumen roof relies on bitumen, a black, sticky, highly viscous substance to which additional elements, called modifiers, are added. These modifiers, which often consist of fiberglass or polyester-based fibers, strengthen and increase the durability of standard roofing asphalt.
Moreover, the roofing material is often installed in multi-ply or two-layer systems, providing added protection against heat, cold, and inclement weather.
If you are choosing a bitumen roof system, be aware that the membrane comes in two basic forms, SBS and APP:
Built-Up Roofing (BUR)
Another popular modified roofing option is called built-up roofing, also known as BUR, which has been in use for over a century in the United States.
Constructed using several layers of ply sheets and asphalt, a built-up roofing system is designed to enhance its durability and redundancy.
After installing several layers of roofing material, a contractor will complete the system by adding a cap sheet or flood coat of asphalt and granules.
The multiple layers found in built-up roofing result in exceptional resistance to harsh weather, such as heavy rain, hail, snow, ice, or high winds.
