Modified bitumen roofing is a type of asphalt-based roofing material commonly used in low-slope or flat roof applications. It is made by modifying traditional asphalt with polymers to enhance its durability and resistance to weathering.

Modified bitumen roofing typically consists of a base layer reinforced with fiberglass or polyester, followed by one or more layers of modified bitumen. It can be installed using a variety of methods, including torch-applied, cold adhesive, or self-adhered.

Modified bitumen roofing is known for its excellent flexibility, making it well-suited to areas with extreme temperature fluctuations. It is also resistant to UV radiation, punctures, and tears, and has a relatively long service life.