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| Possible cause: Leaky or inadequate shingle underlayment or deteriorated flashing |
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| Possible cause: Inadequate shingle underlayment allows water from ice dams to leak into attic |
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| Possible cause: Excessive temperature or high humidity due to poor attic ventilation |
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| Possible cause: Inadequate or faulty shingle underlayment allowing leakage or inadequate ventilation |
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| Possible cause: Poor attic ventilation |
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| Possible cause: Shingles have reached the end of their useful life |
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| Possible cause: Environmental pollutants; vegetation, fungus or algae; loss of granules due to age of shingles |
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Possible cause: Insufficient attic ventilation causes heating/cooling system to run excessively
In warm weather, inadequate ventilation will trap hot air in the attic, causing air conditioning systems to work harder, or leaving your home's interior hotter and less comfortable.
Attic Ventilation: In both hot and cold weather, insufficient attic ventilation may cause moisture in the attic to become trapped and condense on the rafters. This condensed moisture can drip down onto the insulation and reduce its effectiveness.
Excessive energy costs can result.
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