Abstract: Employee #1 and a coworker were spreading out 3 ft by 20 ft by 9 5/8 ft corrugated sheet metal panels on a roof. They were working south to north, pulling panels from stacked bundles onto joists and laying the panels across the joists at equal lengths, with an approximately 1 in. overhang. The coworker would tap weld a panel and a welder would follow to weld it in place. Employee #1 was retrieving a panel when he stepped on an unsecured corner of another metal panel. It gave way, and he fell approximately 25 ft onto the concrete floor. Medical assistance was given, and Employee #1 was transported to the hospital. The cause of this accident was failure to follow verbal instructions on spreading the sheet metal decking. There were no accident-related violations.