面防水是建筑工程中存在的质量通病，也是多年来一直未能很好解决的难题。目前，较多采用的是刚性及柔性防水两种做法。刚性防水由于温差应变，易开裂渗水；柔性防水，多为沥青，油毡等有机材料，易老化，寿命短。近年来，虽然各种新型防水材料相继问世，但由于价格较高，缺乏施工经验，且耐久性还有待于进一步检验等原因。因此，目前还是采用较为廉价的材料为主。　　
采用刚性防水和柔性防水相结合的办法，理论上可提高屋面的防水，而在实际施工过程中，或多或少地存在一些不够重视底层刚性防水层的心理，使得刚性防水层开裂，起鼓或渗漏，这样刚性的防水层形同虚设，加上柔性防水层也存在其自身的缺点，因而"双重保险"也不能有效防止屋面渗漏。 　　
在此，就安居工程4＃楼屋面防水处理，谈谈其设计与
Surface water is the common quality problems that exist in construction, also has been unable to solve the problem very well. Currently, more use of the rigid and flexible waterproof two approaches. As the temperature response of rigid water-proof, easy to crack water seepage; flexible waterproof, mostly asphalt, linoleum and other organic materials, easy to aging, short life. In recent years, although a variety of new waterproof material one after another, but higher prices, lack of construction experience, and needs further testing, and durability reasons. Therefore, it is still mainly used cheaper materials.
Rigid waterproof and flexible method of combining water, in theory, can improve the roof's waterproof, and in the actual construction process, there are not more or less attention to the underlying psychological rigid waterproof layer, so rigid waterproof layer cracking, the drum or leakage, so rigid, waterproof layer of dead letter, together with flexible waterproof layer there are the shortcomings of its own, and therefore a "double insurance" can not effectively prevent roof leakage.
Here, the housing project 4 # Floor, roof waterproofing, to talk about its design and