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近年来建筑的屋面有了很大的变化,因为现代建筑多为平屋顶,这可使建筑在不增加高度的情况下多一层使用面积。在这种形势下,瓦或石板等传统的屋面材料就逐渐让位于其它的防水材料,先是沥青,然后是改性沥青,现在人们越来越多地使用硫化橡胶片材做防水材料,这一点在美国尤为突出。片材是在工厂进行压延和硫化,最后在施工现场用胶进行粘接的。从前使用的是丁基橡胶,现在则经常使用三元乙丙橡胶片材。这是一种具有优良耐老化性和耐恶劣气候的片材,其价格具有很大的竞争能力。
In recent years, the roofs of buildings have undergone great changes because modern buildings are mostly flat roofs, which allows the building to use one more floor without increasing the height. In this situation, traditional roofing materials such as tiles or slate gradually give way to other waterproof materials, first asphalt and then modified asphalt. Nowadays, more and more vulcanized rubber sheets are used as waterproof materials. Especially prominent in the United States. Sheets are calendered and vulcanized at the factory and finally glued at the construction site. Previously used was butyl rubber, and now EPDM sheets are often used. This is a sheet with excellent weatherability and weather resistance, and its price is highly competitive.