WHILE FIRE BOSSING A ROOF FALL OCCURRED, ONE BRKIN BY SUPPLY STATION 1090, WHICH WAS A CONTINUATION OF A PILLAR FALL. SIZE OF FALL 20' WIDE BY 60' LONG BY 15' HIGH. AREA HAD BEEN TIMBERED AND CRIBBED OFF ROOF FALL DOES NOT EFFECT VENTILATION, AND DOES NOT EFFECT TRAVEL.