Missing Shingles

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Caused by improper fastening.

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Caused by exposure to high winds.

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Caused by aging.

 Buckling and Curling

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Caused by improperly applied felt.

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Caused by movement in the deck.

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Caused by under-saturation of asphalt felt.

 Blistering

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Caused by application over wet deck.

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Caused by moisture in shingle.

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Caused by inadequate ventilation.

 Fungus Growth

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Caused by growth of airborne fungi or algae deposited on roof.

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Appearance problem that does not affect the service life of the roofing material.

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Occurs most often in warm, humid climates such as the southeast (where fungus resistant shingles are available).