The main types of roof damage fall into nine categories: hail, wind, water and leaks, snow and ice, tree and impact, moss and algae, structural aging, animal and pest activity, and flashing failure. Every type belongs to one of two buckets that decide your repair path and your insurance odds: sudden storm damage or gradual wear. Identifying the type of roof damage you have tells you the likely repair cost and whether a claim will hold.
What are the main types of roof damage?
The main types of roof damage are hail, wind, water intrusion, snow and ice, tree and impact, biological growth, structural aging, pest activity, and flashing failure. Insurers group them differently: sudden, accidental events (hail, wind, a fallen limb) are typically covered, while wear, rot, and neglect are typically excluded. The table below maps each type to its telltale look, a 2026 repair range, and its usual coverage status.
| Damage type | Main cause | What it looks like | Typical 2026 repair cost | Usually insured? |
|---|---|---|---|---|
| Hail | Impact from hailstones | Round bruises, cracked mats, granule loss, metal dents | $150 to $600 spot, or full replacement | Yes, sudden event |
| Wind | Uplift from high wind | Creased, lifted, or missing shingles | $150 to $700 for a few shingles | Yes, sudden event |
| Water and leaks | Failed seal, flashing, or aging | Ceiling stains, damp decking, drips | $400 to $1,700 | Depends on source |
| Snow and ice | Ice dams, load, freeze-thaw | Edge icicles, interior leaks, sagging | $300 to $600 removal, more inside | Sometimes |
| Tree and impact | Falling limbs or debris | Punctures, crushed decking, broken tiles | $500 to $5,000 or more | Yes, sudden event |
| Moss and algae | Shade, moisture, organic growth | Black streaks, green mats lifting shingles | $400 to $700 soft wash | No, maintenance |
| Structural aging | UV, age, moisture over time | Curling, bald spots, decking rot, sagging | $1,000 to $3,000 decking | No, wear and tear |
| Animal and pest | Rodents, raccoons, birds, insects | Chewed edges, nests, torn vents | $300 to $1,500 | Rarely |
| Flashing failure | Corrosion, lifted metal, bad install | Rust, gaps at walls, chimneys, valleys | $200 to $600 | Depends on cause |
The split that matters most sits in the last column. A carrier pays for a peril that struck on a date, not for a roof that wore out. That distinction runs through every type below, and it is why our 2026 Severe Weather Roof Damage Report tracks hail and wind claims state by state.
Hail damage
Hail damage shows up as round, dark bruises where granules are knocked loose, cracked or fractured shingle mats, and dents on metal panels, vents, and gutters. Asphalt shingles usually start bruising at about one inch of hail (quarter size), and stones of 1.25 inches or larger commonly trigger insurance claims. The bruise feels soft, like a fresh apple, because the mat underneath has fractured.
Granule loss is the lasting harm: bare asphalt bakes under UV and ages fast. Metal roofs rarely leak from hail, but functional denting and coating fractures can still support a claim. See hail damage to roof shingles for a close look at what adjusters mark and miss.
Wind damage
Wind damage appears as creased, lifted, torn, or completely missing shingles, usually starting at edges, ridges, and rakes where uplift is strongest. Sustained winds of 50 mph and higher can break the self-seal strip, and gusts past 60 mph pull shingles free. Architectural shingles carry ASTM D7158 ratings from Class D (90 mph) to Class H (150 mph), but an aged seal fails well below its label.
A creased shingle that flapped and set back down still counts as damage: the seal is broken and it will leak or blow off in the next storm. Look for a horizontal crease line and exposed nail heads on the course below. Our guide to wind damage to roof shingles covers how to separate a fresh tear from old mechanical wear.
Water damage and leaks
Water damage is the downstream result of most other roof problems, not usually a first cause on its own. It reads as brown ceiling stains, a musty attic, damp or spongy decking, and active drips during rain. The entry point is often far from the interior stain because water travels along rafters and sheathing before it drops.
Chronic moisture rots the deck, corrodes fasteners, and grows mold inside the assembly. Because the root cause can be a sudden event (a wind-torn shingle) or slow wear (a cracked pipe boot), water damage lands in either insurance bucket depending on what the adjuster traces it back to.
Snow and ice damage
Snow and ice damage comes from three mechanisms: dead load from deep accumulation, freeze-thaw cracking of materials, and ice dams at the eaves. An ice dam forms when heat escaping the attic melts snow up-slope, and the runoff refreezes over the cold overhang, backing water up under the shingles.
- Ice dams: Water pushes under shingles and leaks into soffits and ceilings.
- Load: Wet snow near 20 pounds per cubic foot can overstress a weak or low-slope deck.
- Freeze-thaw: Water in small cracks expands as it freezes and widens them.
The IRC (section R905.1.2) requires a self-adhered ice barrier from the eave to at least 24 inches inside the exterior wall line in regions with a history of ice forming at the eaves. Roofs missing that membrane leak first.
Tree, debris, and impact damage
Tree and impact damage ranges from cosmetic abrasion to a limb through the deck. A branch resting on shingles scours granules every time it moves in the wind, while a falling limb can puncture the sheathing, crush trusses, and break tiles. Even small debris that dams a valley or clogs a gutter forces water sideways under the field.
A fallen tree is a sudden accidental event, so the roof repair is generally claimable, though removing the tree itself may have separate limits. Document the position before anything is moved. Impact damage is one type where a full structural check for rotted or broken roof decking is worth the cost before shingles go back on.
Moss, algae, and biological growth
Biological damage is a maintenance problem, not a peril. Black streaks are Gloeocapsa magma algae feeding on limestone filler in asphalt shingles, which is mostly cosmetic. Moss is the structural threat: thick green mats hold water against the surface, lift shingle edges, and let moisture wick under the course, which speeds rot in shaded, humid, north-facing slopes.
Insurers treat moss and algae as owner neglect, so cleaning and any resulting rot come out of pocket. Soft washing, not pressure washing, removes growth without stripping granules. Zinc or copper strips near the ridge suppress regrowth. For the streak version specifically, see how to clean and prevent algae streaks on a roof.
Structural aging and material wear
Structural aging is the slow failure every roof reaches: shingles curl, cup, and lose granules, sealants dry out, and the deck softens. This is the type insurers explicitly exclude as wear and tear, because it is expected, not accidental. Bald patches, widespread curling, and exposed fiberglass mat mean the roof is near the end of its service life.
The parts that rot from below matter as much as the shingles: fascia, soffit, and plywood decking decay under chronic moisture and undermine everything above them. A sagging ridge or a deck that flexes underfoot is a structural signal, not a surface one, and it usually points to full replacement rather than a patch.
Animal and pest damage
Animal damage comes from raccoons that tear back shingles and nest in insulation, squirrels and rats that gnaw fascia and wiring, birds that block ridge and box vents, and wood-boring insects in the deck. The entry hole is often small, but the interior nesting and the leak it opens are not. Droppings in the attic and scratching sounds are early tells.
Most policies treat animal damage as a maintenance or exclusion issue, so it rarely pays out. Sealing gaps at the ridge, soffit, and vent penetrations with rigid metal, not foam, is the durable fix, since animals chew straight through foam and mesh.
Flashing failure
Flashing failure is a leading source of roof leaks even when the shingles look fine. Flashing is the metal that seals joints at chimneys, walls, valleys, skylights, and pipe penetrations. It fails from corrosion, lifted or unsealed laps, thermal movement, and poor original installation that relied on caulk instead of proper overlap.
Because flashing sits at every transition, a single gap the width of a pencil can channel a large volume of water into the assembly. Rust streaks, a visible gap where the roof meets a wall, and stains directly below a chimney point to flashing, not the field shingles.
Storm damage versus normal wear: the insurance line
The practical difference between storm damage and normal wear is timing and cause: a peril that struck on a specific date versus deterioration that accrued over years. Insurers pay for the first and exclude the second, and that single distinction decides most roof claims. Hail, wind, and fallen limbs are sudden and accidental. Moss, curling, granule loss from age, and rot are wear.
| Signal | Points to storm damage | Points to normal wear |
|---|---|---|
| Onset | After a dated event | Gradual over years |
| Pattern | Directional, on the storm-facing slope | Uniform across the whole roof |
| Shingle look | Fresh crease, bright fracture, soft bruise | Brittle, curled, faded, bald |
| Coverage | Usually claimable | Usually excluded |
Carriers also pay on either actual cash value (depreciated) or replacement cost value, which changes the payout even when a claim is approved. Whether a specific loss qualifies varies by policy, state, and the age of the roof, so read the perils and exclusions before you file. For the full breakdown, see whether homeowners insurance covers roof damage, and start with the fundamentals in our roofing learning hub.
Frequently asked questions
What are the most common types of roof damage?
The most common types are wind and hail damage, followed by water intrusion and leaks. Wind lifts, creases, and removes shingles, hail bruises and cracks them, and water damage follows once the surface is breached. Storm perils dominate insured claims, while moss, granule loss, and decking rot are the most common wear-related problems homeowners pay for themselves.
What is the difference between storm damage and normal roof wear?
Storm damage is sudden and accidental, caused by a dated event such as a hailstorm or high wind, and it usually appears in a directional pattern on the storm-facing slope. Normal wear is gradual, uniform across the whole roof, and shows as brittle, curled, faded, or bald shingles. Insurers cover the first type and exclude the second as wear and tear.
What types of roof damage does homeowners insurance cover?
Most policies cover sudden, accidental perils: wind, hail, fallen trees, and fire. They typically exclude wear and tear, age, rot, poor maintenance, moss, and pest damage. Coverage and payout depend on the policy, the state, the roof’s age, and whether the claim is settled on actual cash value or replacement cost value, so review your perils and exclusions before filing.
What does hail damage look like on a roof?
Hail damage looks like round, dark spots where granules are knocked off, cracked or fractured shingle mats, and dents on metal panels, vents, and gutters. A hail bruise feels soft when pressed because the mat beneath has fractured. Asphalt shingles usually begin bruising at about one inch of hail, and stones of 1.25 inches or larger commonly cause claimable damage.
How much does it cost to repair roof damage?
In 2026, a minor shingle or flashing repair often runs $150 to $700, a traced leak repair $400 to $1,700, ice dam removal $300 to $600, and decking replacement $1,000 to $3,000. Costs depend on the damage type, roof pitch and material, and how much of the deck is involved. Widespread storm damage often makes full replacement the cheaper long-term choice.
Can moss damage a roof?
Yes. Moss holds moisture against the roof surface, lifts shingle edges, and lets water wick under the course, which accelerates rot on shaded, humid slopes. Algae streaks are mostly cosmetic, but moss is a structural threat. Soft washing removes it without stripping granules, and zinc or copper strips near the ridge slow regrowth. Insurers treat moss as maintenance, not a covered peril.
Reviewed by The Roofing Brief Team. Last reviewed July 2026.