Aucoin’s Cambridge service-area page points to EPDM, TPO, and modified bitumen membranes as flat and low-slope roofing systems engineered for drainage and movement over time. The right material depends on the structure, the roof design, and how the space is being used. At Aucoin Roofing, the focus is on matching the roofing system to the building properly so the finished roof performs well under real local conditions.