Crew heard roof fall in adjacent room. Section foreman went to investigate and found fall in #2 room through #3 room. Fall was 18' high x 45' long x 5' high. Area was bolted with 4' resin bolts. Rock was laminate. This was in the 1 west butt section 95' inby spad # 731 in #2 room and 65' inby spad #728 in #3 room. Area was dangered off with cribs.