屋面防水层长期处于自然环境中,其老化损坏是缓慢的化学变化过程,而设计上不合理或失误造成防水卷材面层的破损,应引起足够重视。多年经验证明,由水泥砂浆制作的防水基层,因其自身强度低、刚度小,又因在填充的保温材料上,脱水快,干缩大,终凝后产生许多龟裂。在上部卷材铺设过程 The roof waterproofing layer is in the natural environment for a long time, its aging damage is a slow chemical change process, and the design is unreasonable or mistaken to cause the damage of the waterproof membrane surface layer, should pay enough attention. Many years of experience have proved that the waterproof base layer made of cement mortar has low strength and small rigidity, and because it is filled in the insulation material, the dewatering is quick, the drying shrinks, and many cracks occur after the final coagulation. In the process of laying the upper coil