- There are
stains on your interior ceilings and/or walls.
cause: You either have inadequate or faulty shingle underlayment
allowing leakage from ice dams.
- You notice
decay of roof shingles, sheathing, and/or siding.
Possible cause: Poor attic ventilation
- You find
missing, cracked or curled shingles.
Possible cause: Shingles have reached the end of their useful
- You see dark,
"dirty-looking" patches on your roof.
Possible cause: Environmental pollutants; vegetation, fungus
or algae; loss of granules due to age of shingles.
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.