Ceiling Spots
- Caused by links in the roof
- Check attic and crawl space for leaks in the deck
- Check chimney and vents for cracks in the flashing
- Check rafters for leaks that "travel" away from original source
- Check eaves for ater backing up from ice dams
- Check roof for damaged shingles
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Damaged Flashing
- Caused by improper installation (on new roof)
- Caused by drying and cracking (on old roof)
- Can sometimes be repaired without replacing roof
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Missing Shingles
- Caused by improper fastening
- Caused by exposure to high winds
- Can usually be replaced individually
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Buckling & Curling
- Caused by improperly applied felt (buckling)
- Caused by movement in deck (buckling)
- Caused by under saturation of asphalt felt (curling)
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Blistering
- Caused by application over wet deck
- Caused by moisture in shingle
- Caused by inadequate ventilation
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Fungus Growth
- Caused by growth of airbourne fungi or algae deposited on roof
- Appearance problem - does not affect the service life of the roofing material
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Missing Granules
- Normally a certain number of granules will be loose, especially after application
- On aging shingles, indicates the need for replacement
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Rotting
- Caused by absorption of moisture by mat
- Common problem with organic-based shingles
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