Distorted and curled up shingles are often a sign of insufficient attic ventilation. Proper air flow is crucial to extend the life of your roof and help alleviate ice dams and attic condensation in the winter. Air flow will also reduce heat build up in the summer. Soffit vents allow fresh air into your attic while roof vents exhaust hot, humid air. You need to have equal intake and exhaust vents in order for attic ventilation to be effective,. Therefore, for every soffit vent, you also need a roof vent, or a ridge vent. Before you begin, be sure that you follow any precautions on your ladder.