Since roof and outer surface of the wall is most likely to suffer from weather conditions, like, rain, frost, dew; this is the reason roof surface must be coated with water proof paint. Not only roof, but also walls, being the exterior surface of the house, is more prone to weather damage. That is why, roof and exterior surface of the house, i.e. walls need to be covered and coated with weather proof paint.
These weather proof paints protect the walls and roof from getting damage. The market is full of varied kinds of Weather Proof Paint which have high tendency of acting as a barrier between the roof and weather. These paints do not only provide protection to roofs and walls but since they carry characteristic of longevity; it also prevents the house owner from getting the wall painted on a regular basis.