DURING THE 1ST SHIFT ON 6/17/04, THE ROOF STARTED WORKING AT SPAD #1297 IN THE #3 HEADING. EMPLOYEES WERE EVACUATED FROM THE AFFECTED AREA AND THE AREA WAS DANGERED OFF. THERE WERE NO INJURIES AND NO EQUIPMENT WAS INVOLVED. THE FALL WAS 8' HIGH, 30' LONG, AND 30' WIDE AT THE INTERSECTION. THE FALL HAS BEEN CLEANED UP AND BOLTED.