An employee climbed onto the fourth story roof of a multi-family structure to begin installing flashing around chimneys. As he stepped to connect his lanyard to a lifeline, he slipped on synthetic felt covering the roof and fell approximately 30 feet onto a porch overhang, before falling about 10 more feet onto a concrete driveway. He was hospitalized with a fractured upper front right rib, a laceration to the back of the head, a concussion, and abrasions to the face.