Due to harsh weather conditions and the process of freezing and thawing, shingles can expand and contract causing nails to back out allowing water to penetrate the roofing structure and cause leaks.
The best way to extend the life of your residential roof is with a comprehensive roof maintenance plan. Ideally a residential roof needs to be checked twice year, once in the spring (after trees finish budding), and once in the fall (after the leaves have fallen). The gutters and downspouts need to be cleaned to eliminate damage from water back up into the roof or ice damage due to poor drainage. A well-maintained roof will last much longer than a roof that is ignored. A maintenance program can be very beneficial to extend the life of your roof system.
Whether it be on a home or a commercial building, keeping the gutters and downspouts clean of debris is an important step in the right direction to ensuring the longevity of your roofing system. When water can't properly drain off the roof it causes ponding water, leaks and deterioration.