While most roofs have a few different degrees of pitch, for the most part, your roof should appear fairly straight along its lines. This means that anytime you spot an area of your roof that seems to be warped or has started sagging, it is important to have a professional come out and take a look as soon as possible. Sagging areas of your roof indicate a major problem, and it’s one that’s only going to get worse as time goes on. Your best bet in this situation is to have the pros come in and get to the bottom of the issue as soon as possible.