1. Dark, “dirty-looking” areas on roof - Possible causes: environmental pollutants; vegetation, fungus or algae; loss of granules due to shingle age.
2. Missing, cracked or curling shingles - Possible cause: shingles being at the end of their useful life.
3. Leakage in attic after driving rain - Possible cause: leaky or inadequate shingle underlayment or deteriorated flashing.
4. Roof shingle, sheathing and siding decay - Possible cause: poor attic ventilation.
5. Blistering/peeling of outside paint - Possible cause: excessive temperature or high humidity due to poor attic ventilation.
6. Stains on interior ceilings/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 allowing heating/cooling system to run excessively.
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