Modified bitumen is a type of roofing material made from asphalt or bitumen that has been modified with additional materials, such as rubber or plastic, to improve its performance and durability. Modified bitumen roofing is commonly used in flat or low-slope roof applications, such as on commercial or industrial buildings, and is often applied in layers to provide added protection and durability. Modified bitumen roofing is available in a number of different forms, including self-adhered, torch-applied, and hot-applied, and can be customized to meet the specific needs of a building, such as adding extra layers for added protection or insulation. It is also relatively easy to install, and can be made in a range of colors and styles to match the look of a building. Modified bitumen roofing is known for its durability, resistance to water, UV light, and extreme temperatures, and low maintenance requirements. However, it may require specialized installation techniques, which can result in higher installation costs compared to other roofing materials such as asphalt shingles. Additionally, modified bitumen roofing may have negative environmental impacts due to the use of petroleum-based products. Overall, modified bitumen roofing is a cost-effective and versatile roofing option that provides many benefits over other roofing materials, but also has some limitations.