On 7/27/14 2-feet to 2.5 sagged onto the top of the longwall stage loader and prevented the loader from advancing normally. The area of sagging roof was approx. 4-feet wide by 70-feet long. The #3 entry of the B-15 headgate panel had been supported with 8-foot fully grouted resin bolts on 5-foot centers with steel roof mesh and cable truss bolts on 5-foot centers.