- Uplifting or splitting of the roofing membrane (the material that covers the roof) or decking on flat roofs.
- Punctures in the roof caused by debris hitting it.
- Cracking or other age-related deterioration. This is typically most apparent on southern exposures, and especially on wood or composition shingles.
- Damaged roof-mounted vents or air-conditioning equipment.
- Stripped ridge tiles, or missing or broken tiles on concrete or clay roofs.
- Pitting or pock marking on asphalt shingles or membranes. This can be caused by hail or from toxic substances in seedpods.
- Stripped or torn shingles on asphalt, fiberglass, or cedar roofs.
- Algae growth from poor drainage.
- Previous roof repairs.
- Rotted or rusted decking.
- Worn or rusted flashing.
- Wrinkled roofing membrane.
- Holes from missing shingles or other roofing materials.