Modified Bitumen Roofing system is an asphalt based roofing & the materials of this roofing system are very similar to Built Up Roof. Modified Bitumen is designed only for the low slope or flat roofings & it is one of the most considerable roofing systems for commercial buildings. For more info: https://bit.ly/3j2qXAU Contact Us: Email: [email protected] Phone: (716) 715-0756