Leakage in attic after
wind-driven rain
Possible cause: Leaky or inadequate shingle underlayment or deteriorated
flashing
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Leakage in attic after ice
build-up
Possible cause: Inadequate shingle underlayment allows water from ice dams
to leak into attic
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Blistering and/or peeling of
interior and/or exterior paint
Possible cause: Excessive temperature or high humidity due to poor attic
ventilation
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Stains on interior ceilings and walls or
mold and mildew growth
Possible cause: Inadequate or faulty shingle underlayment allowing leakage
or inadequate ventilation
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Decay of roof shingles,
sheathing, and/or siding
Possible cause: Poor attic ventilation |
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Missing, cracked or curled shingles
Possible cause: Shingles have reached the end of their useful life |
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Dark, "dirty-looking"
areas on your roof
Possible cause: Environmental pollutants; vegetation, fungus or algae; loss
of granules due to age of shingles
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Excessive energy costs
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 c onditioning 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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