Abstract: At approximately 3:20 p.m. on March 28, 2007, an employee and a coworker were trimming off the top of a 4-in. vent pipe protruding through the roof of a residential project. Using a large chain pipe cutter, the employee and the coworker were just about completed with the cut when the 4-in. vent pipe broke causing the employee to loose his balance and fall 9 ft 8 in. off of the roof and onto a concrete walk sustaining a broken leg and sprained wrist. The coworker got down off the roof and called the emergency medical services. The employee was transported to a local hospital, where he was hospitalized and treated for a broken leg.