1. Dark, “dirty-looking” areas on your roof
Possible cause: Environmental pollutants; vegetation, fungus or algae; loss of granules due to age of shingles
2. Missing, cracked or curled shingles
Possible cause: Shingles have reached the end of their useful life
3. Leakage in attic after wind-driven rain
Possible cause: Leaky or inadequate shingle underlayment or deteriorated flashing
4. Roof, shingle, shealthing, and siding decay
Possible cause: poor attic ventilation
5. Blistering and/or peeling of interior and/or exterior paint
Possible cause: Excessive temperature or high humidity due to poor attic ventilation
6. Stains on interior ceilings and walls or mold and mildew growth
Possible cause: Inadequate or faulty shingle underlayment allowing leakage or inadequate ventilation
7. Excessive energy costs
Possible cause: Insufficient attic ventilation causes heating/cooling system to run excessively