The life of any building is dependent on the designer recognizing and considering all the factors relevant to its location, shape, and function of the building. Reliable roofing is the most important part, which decides the quality & ultimately the life of the building. An efficient roofing membrane should never allow even small traces of water to pass through at any given point and should maintain this characteristic over a long period of time. It should withstand slight movements of the structure, bad weather, chemical degradation and mechanical stress and strains.