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.
