一、一般老沥青油毡屋面的渗漏原因: 现今较多的老沥青油毡屋面渗漏,大都不是由于该材料的老化、自然腐损。①很多是被屋面板的热涨、冷缩、负重、挠屈、与原先灌缝不良等在结构上产生裂缝,导致在屋面板的端缝处首先拉裂防水层。②在一些屋面的节点细部、诸如汛水、天沟、墩柱、管根、下水口等处,由于没有按照要求精细铺 I. Causes of leakage of ordinary old asphalt linoleum roof: The leakage of most of the old asphalt linoleum roof today is not due to the aging of the material and natural damage. 1 A lot of cracks are caused in the structure by the thermal expansion, shrinkage, weight-bearing, flexion and flexion of the roof, and the original imperfections, leading to cracking of the waterproof layer at the end seam of the roof panel. 2 In the details of some roof joints, such as gurgling water, gutters, pier columns, pipe roots, and water outlets, etc.