Probable cause:
Leaky or inadequate shingle underlayment or deteriorated flashing
Leaks in your attic after ice build-up
Probable cause: Inadequate or worn out shingle underlayment that is allowing water from ice dams to back up and leak into your attic
Blistering and/or peeling of interior and/or exterior paint
Probable cause:
Excessive temperatures (hot or cold) – or high humidity due to poor attic ventilation
Stains on your interior ceilings and walls – or mold and mildew growth
Probable cause:
Inadequate or faulty shingle underlayment or inadequate ventilation that is allowing water leakage
Decay of roof shingles, sheathing, and/or siding
Probable cause:
Poor attic ventilation or age
Missing, cracked or curled shingles
Probable cause: Your shingles have reached the end of their useful life adn are about to fail
Dark, "dirty-looking" areas on your roof
Probable cause:
Environmental pollutants; vegetation, fungus or algae; and/or loss of granules due to the age of your shingles
Excessive energy costs
Probable cause: Insufficient attic ventilation. In warm weather, inadequate ventilation traps hot air in your attic causing air conditioning to work harder and leaving your home's interior hotter. In summer and winter, insufficient attic ventilation may cause moisture in the attic to become trapped and condense. Then water can drip down onto your insulation, reducing its effectiveness – and result in higher heating and cooling costs
