近年来大多数建筑都用钢筋混凝土平顶屋面,但这种屋面楼房的顶层,室内气温都很高。为了解决这个问题,设计人员多数都采用焦灰隔热层或利用混凝土板搁在砖墩上架空隔热。从实践中得知,焦灰隔热层不隔热而吸热保温,它白天吸收大量的太阳热,夜间向室内外缓慢散发, In recent years, most buildings use reinforced concrete flat-roof roofing. However, the roof temperature of such roofing buildings is high. In order to solve this problem, most of the designers have adopted the coke ash heat insulation layer or use the concrete plate to rest on the brick piers for overhead heat insulation. It is known from practice that the coke ash heat insulation layer is not heat-insulating and heat-insulating, and it absorbs a large amount of solar heat during the day and is slowly distributed indoors and outdoors at night.