What is Mod Bit roofing?

Modified Bitumen Roofing is an engineered product for flexibility.

Expansion and contraction from weather temperatures/humidity/dryness makes asphalt/bitumen/tar products crack when hardened/aged.

On low pitched roofing systems, boxed curbs are built to house large penetrations in order to keep water out. As the roof meets these boxed curbs, a 45* slanted board (cant strip) is installed at the bottom junction, to allow the rolled roofing membranes to bend gradually. Even with the added cant strip in place, regular field membrane cap sheets (granulated roll) can break at the transitions, therefore a need for a more flexible roofing membrane. The modified bitumen products may be used on the horizontal planes as well as the vertical planes, for a longer lasting roof and a higher price.