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 or mold and mildew growth
Possible cause: Inadequate or faulty shingle
underlayment allowing leakage or inadequate
ventilation
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.
