1. Damaged Flashing
- Caused by improper installation
- Caused by drying and cracking
- Can usually be repaired without replacing roof
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2. Moss Growth
- Caused by growth of airborne particles
- Causes an unsightly appearance and affects the service life of the material
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3. Missing Shingles
- Caused by improper fastening
- Caused by exposure to high winds
- Can usually be replaced individually
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