A roof fall measuring 20' long, 20' wide and 5' thick was found in the #7 neutral entry at spad 49879, 5000' outby the working section. The fall occurred due to subnormal coditions at or above the 5' torque tension roof bolts. Ventilation and the passage of men was not affected, no personal injuries resulted from the fall. Fall entrances were cribbed and barricaded.