What is a Modified Bitumen Roof?
Mod-Bit roofs are generally composed of alternating layers of asphalt, synthetic rubber and a reinforcing scrim. Together, these components ensure that your roof is weather and UV-resistant and, of course, watertight. Initially introduced in the 1960s in Europe, Mod-Bit roofs are an evolutionary step from Built-up Roofing (BUR). In Mod-Bit roofs, the bitumen can be modified in two different ways: with plastic (Atactic Polypropylene or APP) or synthetic rubber (Styrene Butadiene Styrene or SBS).