屋面防水等级的划分和设防的要求在建筑工程设计时．根据建筑物的要求不同，曾将防火、抗震等划分为若干等级．并按不同等级的要求进行设防．但屋面防水多年来从未划分过等级，多年实践证明，重要的、高级的建筑，如民面采用低档次的防水材料和简单的防水设防构造，则难以... Dividing and fortification requirements for roof waterproofing grades during construction engineering design. According to the different requirements of the building, fire prevention, earthquake resistance, etc. have been divided into several levels. And according to different levels of requirements for fortification. However, the roof waterproofing has never been classified for many years. It has been proved for many years that important and advanced buildings, such as the use of low-grade waterproof materials and simple waterproof fortification structures, are difficult to...