Fig.1: Missing Cracked or curled shingles

Possible cause: Shingles have reached the end
of their useful life.

Fig.2: Areas on your roof that look dark and dirty

Possible cause: Environmental pollutants;
vegetation, fungus or algae; loss of granules due to the age of the shingles

Fig.3: Decaying of roof shingles, sheathing, and / or siding

Possible cause: Poor attic ventilation

Fig.4: Leakage in attic after wind-driven rain, or ice build up

Possible cause: Leaky or inadequate shingle underlayment,
deteriorated flashing