The main purpose of the roof on your home is to protect itself and the structural components of the home against natural elements ( rain snow sleet hail and wind), most importantly moisture. For the purposes of a home inspection, the roof system consists primarily of the shingles, felt paper, flashings and chimney.
another important part of the roof system is the gutters and downspouts, they direct rainwater and runoff away from the foundation area, to help reduce the potential for water entering the basement area. Because of the important functions the roofing system provides, it's condition should be assessed yearly by a professional roofing contractors. One roofer who i have used in the past is David Ness. He does roofing and gutters in the following massachusetts towns and cities - hingham, fall river, chelsea, dover, waltham, woburn, somerville, revere, cambridge, quincy, needham, newton , cape cod, providence, boston .