Carlisle's Sure-Weld heat-weldable Walkway Roll is designed to protect the Sure-Weld TPO membrane in areas exposed to repetitive foot traffic and other hazards. It must be installed at all traffic concentration points (i.e., rooftop ladders, roof hatches, access doors, etc.) regardless of traffic frequency and must also be installed if regular maintenance (once a month or more) is necessary to service rooftop equipment.