Possible Damage

 Attic Leakage-Wet, Rainy Climates
 Attic Leakage-Icy, Winter Climates
 Blistering/Peeling Paint
 Interior Stains
 Exterior Decay
 Cracking and Curling
 Dirty-Looking Areas
 Energy Costs

Leakage in attic after wind-driven rain
Possible cause: Leaky or inadequate shingle underlayment or deteriorated flashing

Leakage in attic after ice build-up
Possible cause: Inadequate shingle underlayment allows water from ice dams to leak into attic

Blistering and/or peeling of interior
and/or exterior paint

Possible cause: Excessive temperature or high humidity due to poor attic ventilation

Stains on interior ceilings and walls
Possible cause: inadequate or faulty shingle underlayment allowing leakage from ice dams

Decay of roof shingles, sheathing,
and/or siding

Possible cause: Poor attic ventilation

Missing, cracked or curled shingles
Possible cause: Shingles have reached the end
of their useful life

Dark, "dirty-looking" areas on your roof
Possible cause: Environmental pollutants; vegetation, fungus or algae; loss of granules
due to age of shingles

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 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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