Abstract: Employee #1, part of a six-person work crew, was installing a 6 ft long by 25 ft wide section of insulation that had been unrolled across the width of the building, parallel to the leading edge of the finished roof. Employee #1 and three coworkers were sliding the insulation out 6 ft across the purlins to the other crew members, who were working from a 2 ft wide by 3 sheets thick piece of roof decking that was 6 ft from the leading edge. During this process, Employee #1 fell approximately 47 ft between the insulation and the roof deck onto clay. He was killed. Employee #1 was not wearing any fall protection at the time of the accident.