Modified Roofing

Built-up roofing is a continuous roof membrane of layers of roof felts alternated with layers of hot asphalt. Modified Bitumen roofing was first used in the US in the 1970’s and is closely related to Built-up roofing. The Modified Bitumen system comes in a roll and is installed with either torch applied or hot asphalt applications.

Modified bitumen is a very durable product, especially in high-traffic areas and when confined to smaller roof areas with a high density of service equipment. The flexible nature of the "modifiers" allows owners to select a roof that is a thicker product and more resistant to building movement and metal-to-membrane interfaces than a built-up roof system.