Roof shingle, sheathing and siding decay.
Possible cause: Poor attic roof ventilation.


Missing, cracked or curling shingles.
Possible cause: Shingles have reached their useful life.

Dark, "dirty looking" areas of roof
Possible causes: Enviormental pollutants; vegetation, fungus or algae growth; loss of granules due to age of shingle.


Excessive energy costs.
Possible cause: Insufficient attic ventilation causes the heating and 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. 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 it's effectiveness. Excessive energy costs can result.
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