While the foundation of a house is truly that, a foundation to build on, the roof is the finishing touch that brings the building together and seals the inside from the elements. The strength of roof is integral to the strength of the house and its protection through all means of weather and temperatures.
If the roof is damaged, it's only a matter of time before the damage will get worse or before the walls and internal housing space will also be affected as a result.
Although it is one of the most important aspects of the home, the roof also tends to be the most neglected. Not many homeowners take the time to regularly inspect their roof and catch any problems before they become exacerbated. As such, roof repairs end up being a costly affair when you finally realize you need the services posthaste. However, this is not simply the contractors trying to make profit off your misfortune.