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Ceiling Spots
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Cause: Leaks in the roof (check roof for damaged shingles). Check eves for water backing up from ice dams, check rafters for leaks that "travel" away from original source, check chimney and vents for cracks in flashing, and check attic and crawl space for leaks in the deck.
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Damaged Flashing
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Cause: Improper installation (new roof) or drying and cracking (old roof). This can sometimes be repaired without replacing roof.
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Missing Shingles
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Cause: Improper fastening or exposure to high winds. Shingles can usually be replaced individually.
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Buckling & Curling
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Cause: Improperly applied felt (buckling), movement in deck (buckling), or under saturation of asphalt felt (curling).
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Blistering
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Cause: Application over wet deck, moisture in shingles, or inadequate ventilation.
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Fungus Growth
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Cause: Growth of airborne fungi/algae on roof. This is an appearance problem that typically does not affect the service life of the roofing material.
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Missing Granules
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Cause: Normally a certain number of granules will be loose, especially after application. On aging shingles it indicates a need for replacement.
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Rotting
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Cause: Absorption of moisture by mat. This is a common problem with organic-based shingles.
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