The inspection degree of process quality control reaches 100%, the inspection degree of material and equipment quality control reaches 95%, the concealed works are 100% accepted on site, and the on-site inspection is 100% implemented as required. The patrol parallel inspection and witness shall not be less than 4 hours every day. Through the control of each control point, problems can be found in the patrol and acceptance, and the construction unit can be urged to rectify the existing problems, so that the roof works