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
Exterior Decay,
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.
