Leakage in Attic After
Wind-Driven Rain
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Possible cause: Leaky or inadequate shingle underlayment or deteriorated flashing
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Leakage in Attic After
Ice Build-Up
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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
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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
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Possible cause: Inadequate or faulty shingle underlayment allowing leakage or inadequate
ventilation
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Exterior Decay,
Sheathing, and/or Siding
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Possible cause: Poor attic ventilation
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Missing, Cracked,
or Curled Shingles
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Possible cause: Shingles have reached the end of their useful life
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Dark, "Dirty-Looking" Areas
On Your Roof
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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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