How to Identify Hail Damage on a Roof

Quick answer: Hail damage on asphalt shingles looks like dark circular bruises with displaced granules and a softened mat underneath. On metal roofs, look for round dents on north and west slopes plus cracked coating. On tile, look for corner chips and hairline cracks. Hail under one inch rarely damages asphalt; one inch and larger usually does (IBHS hail research, NOAA NWS Storm Prediction Center).

What hail damage looks like on asphalt shingles

Hail impacts on an asphalt shingle leave four distinct signatures. Knowing which signature corresponds to which size of stone is what separates a real storm claim from a wear-and-tear denial.

Bruising is the dark circular impact mark where the hailstone struck and compressed the underlying fiberglass mat. Press the bruised area with a thumb. A hail bruise feels soft, almost spongy, because the mat fibers fractured under impact. A normal shingle feels firm. This soft-spot test is the single most reliable way to tell a hail bruise from an ordinary granule-loss patch. Bruising is what the Haag Engineering hail damage assessment guidance treats as the primary functional-damage signature.

Granule loss shows up as a black-edged pocket where the protective ceramic granules have been knocked off, exposing the asphalt mat. Granule loss in the shape of a circle (not a streak) at the center of a bruise is a high-confidence hail indicator. Granule loss in streaks along the gutter line is usually weathering and water flow, not hail.

Exposed mat is the next stage past granule loss. The asphalt is visible to UV. UV exposure begins degrading the asphalt the moment the mat is exposed, which is why an unaddressed hail impact accelerates the rest of the slope toward end of life over the months after the storm.

Random distribution matters. Real hail damage shows up on multiple slopes in a random pattern, with most impacts concentrated on the north and west faces (hail usually arrives on a southwest-to-northeast track in much of the United States, and the prevailing wind drives stones into the windward face). Damage concentrated on one slope along a line is usually mechanical (a ladder, a foot, a tree branch), not hail.

What hail damage looks like on metal roofs

Metal roofs respond to hail with denting and coating fracture rather than bruising. The same size hailstone that bruises asphalt leaves a round, contained dent on metal.

Dents on a metal panel are easiest to spot in raking light at sunrise or sunset, when the shadows along the dent rim make the impact visible from the ground. Stand at the eave and sight up the slope at a low angle. Dents on the north and west slopes of a steel or aluminum roof confirm the storm direction. Dents concentrated on one panel along a line are mechanical, not hail.

Coating fracture is the cosmetic-vs-functional dividing line on metal. A dent that did not crack the coating is usually classified as cosmetic by carriers using ISO HO 04 95 endorsements. A dent that fractured the paint, primer, or galvanized layer exposes the underlying steel to corrosion and is functional damage. The Metal Construction Association publishes a hail-damage technical bulletin that walks through the test methods.

Seam impact matters more than field-panel impact. A hailstone that struck a standing-seam crimp or a screw line can deform the seal or back out a fastener, both of which create a leak path. Inspect seams and screw lines independently from the field panel even if the rest of the roof looks intact.

What hail damage looks like on tile and slate

Concrete and clay tile resist hail well in the center of the tile but chip and crack at the edges and corners.

Corner chips are the most common tile hail signature. A clay or concrete S-tile struck at the corner loses a visible chunk. Even a missing corner under 1 inch can break the watershed path on the underlying batten and is functional damage.

Hairline cracks run along the long axis of a tile after a direct impact. Cracks are easiest to spot when the tile is damp, because moisture wicks into the fissure and darkens the line. Walk the slope on a foggy morning or have a contractor mist the roof with a hose before inspection.

Slipped tiles that have rotated out of alignment after a hail-and-wind event indicate broken battens or fasteners underneath. The damage may be the tile, the fastener, the batten, or the underlayment, and only a lift inspection will tell.

Slate slate roofs follow tile inspection rules with one additional check: tap the slate gently with a wooden hammer handle. A sound slate rings; a cracked slate gives a dull thud.

The soft-metal test

The cleanest way to confirm hail did or did not hit your property at a damaging size is the soft-metal check. Soft metals on a house bend and dent at lower energy thresholds than the roof itself, which makes them an early-warning surface.

Inspect these four soft-metal targets from the ground before you ever climb a ladder:

| Surface | What confirms hail | What rules it out | | --- | --- | --- | | Aluminum downspouts | Round dents from the side, dimples on the face | Crumpling, kinks (mechanical impact) | | Aluminum gutter aprons | Round impressions on the top face, sometimes paired with a bend | Long lines (snow shovel or branch) | | AC condenser fin coil | Bent fins in a random pattern across the top of the unit | Bent fins in a single direction (debris) | | Roof flashings and vent caps | Round dents on the top face | Diagonal scuffs (foot traffic) |

If the downspouts, gutters, AC fins, and vent caps show no impact damage and the storm date is recent, the shingle damage is unlikely to be hail. If the soft metals are dented but the shingles look intact, the hailstone was likely below the threshold for shingle damage (often around 1 inch). If both show impacts, the case for hail is strong.

Hailstone size to damage threshold

Hailstone size correlates directly with the type and severity of damage. The thresholds below are drawn from IBHS hail severity research and field-tested in Haag Engineering hail damage assessment guidance.

| Hailstone diameter | Common reference | Damage threshold | | --- | --- | --- | | Under 3/4 inch | Pea to small dime | Generally no damage to typical asphalt or metal | | 3/4 inch to 1 inch | Penny to nickel | Possible damage to aging asphalt, soft metals, vinyl | | 1 inch to 1.25 inch | Quarter to half dollar | Damage common to standard asphalt; functional damage to soft metals | | 1.25 inch to 1.75 inch | Half dollar to ping-pong ball | Widespread damage to asphalt; dents on metal panels | | 1.75 inch to 2.5 inch | Ping-pong ball to lime | Mat fracture on asphalt; coating fracture on metal; tile chip and crack | | Over 2.5 inches | Larger than a tennis ball | Catastrophic damage across most roof materials |

Hailstones rarely fall as uniform sizes. A storm cell can drop pea-sized hail at one address and golf-ball hail four blocks away. The size that hit your roof is established by physical evidence (impact dimples on soft metals, impact dents on flashings, the diameter of the bruise pocket on asphalt), not by the broader storm report.

Verifying the storm date by ZIP

The NOAA NWS Storm Prediction Center storm reports page publishes daily logs of severe-weather events including hail size by location. Cross-check the storm date and ZIP code with the SPC report to confirm hail of the right size occurred near the property on the day the homeowner believes damage occurred.

The procedure:

Open the SPC storm reports archive.
Select the date of the suspected storm.
Find your county or city on the hail-reports map.
Note the reported hailstone size and the time of the event.
Compare against the physical evidence on the roof.

The NCEI Storm Events Database carries the same data in a searchable format and is the source most insurance carriers cite when validating a claim. Carriers also subscribe to third-party hail-verification services (CoreLogic, ImpactGuard, ICMS) that geocode storm reports to the property address. A homeowner who knows the SPC date and size of the hail near the property is positioned to rebut a "no qualifying storm at this address" denial.

How long after the storm can damage appear

Hail impacts happen during the storm. Visible signs of those impacts can take weeks or months to develop into obvious damage. The mechanism:

Granule loss accelerates after the impact as the loosened granules wash off in subsequent rain events. A bruise that looked minor right after the storm can show clear exposed-mat patches three to six months later.
UV degrades the exposed asphalt mat, which makes the bruise area visibly darker and rougher over time.
Leaks usually do not appear until the next heavy rain or until water finds a path through the impaired shingle layer to the underlayment, then to the deck, then to the interior. Interior leaks can take many months to surface, especially in attics with healthy ventilation that dries the deck between rain events.

Most policies require notice of the loss within a defined window from the date of the storm, not from the date the homeowner noticed damage. Common policy notice windows run from 30 days to one year, with state-specific hurricane and windstorm windows tighter still. File a claim quickly even when the damage looks minor; the NAIC state directory of insurance departments lists the prompt-notice rules for each state.

What documentation to gather before calling

Before you call a roofer or your insurance carrier, gather what you can from the ground:

Date and time of the suspected storm.
ZIP code and county.
The SPC storm report URL for that date and area.
Ground-level photos of soft-metal targets (downspouts, gutters, AC fins, vent caps).
Any photos a neighbor took during the storm of hailstones next to a known-size object (a coin, a baseball, a ruler).
Your policy declarations page, with the deductible and the wind/hail deductible line circled.

A contractor inspection produces the slope-by-slope photo file the carrier needs. The homeowner's ground-level documentation supports the contractor inspection and proves the timeline. Both are part of the same record. The Roof Insurance Claim Appeal guide walks through what to do if the carrier comes back with a smaller scope or a denial.

When to request an inspection

Schedule a professional inspection if:

Visible bruising, granule loss, or denting on any slope, even one impact.
Confirmed hail of 1 inch or larger near the property per the SPC report, regardless of visible damage from the ground.
Soft-metal hail signatures on downspouts, gutters, AC fins, or vent caps.
Interior signs (ceiling stains, attic moisture) within six months of a known storm.
Roof is over 10 years old and a storm of any size hit the property.

Stay off the roof yourself. Walking on a hail-impacted roof can dislodge marginal shingles and turn cosmetic damage into functional damage. Ground-level inspection plus a contractor on the roof is the standard procedure. The contractor produces a written report with slope-by-slope photos and impact counts that becomes the foundation of any insurance claim.

FAQ

What does hail damage look like on a shingle roof?

Dark circular bruises with displaced granules, a softened mat underneath that feels spongy when pressed, and random distribution across slopes with concentration on the north and west faces. Damage along a single line is usually mechanical, not hail.

How big does hail have to be to damage a roof?

One inch and larger commonly damages standard asphalt shingles. Three-quarter inch can damage aging shingles and soft metals like aluminum gutters and AC fins. Two inches and larger usually causes widespread functional damage across asphalt, metal, and tile.

How do I know if a storm hit my house?

Cross-check the date and ZIP with the National Weather Service Storm Prediction Center storm reports at spc.noaa.gov/climo/reports. Find the day, locate your county or city on the hail-reports map, and note the reported hailstone size and time of the event.

Can hail damage show up months later?

Yes. The impact happens during the storm but the visible damage develops over weeks or months as granules wash off, the exposed mat oxidizes, and the impaired shingle layer lets water through. File the claim on time per your policy notice window even if the damage looks minor.

Should I get on the roof myself?

No. Inspection from the ground or by a licensed roofing contractor is the recommended path. Walking on a hail-impacted roof can dislodge marginal shingles and turn cosmetic damage into functional damage. The professionals carry liability insurance for ladder and roof work.

Does insurance pay for hail damage?

Most HO-3 policies cover sudden hail loss subject to the deductible, any wind/hail sub-limit, and any cosmetic damage exclusion. Metal roofs commonly carry an ISO HO 04 95 endorsement that limits payment to functional damage only. Read your declarations page and the endorsement schedule before filing.

This guide was written by the Local Roofing Help Editorial Team and reviewed by a licensed roofing contractor. Last reviewed: 2026-05-26. Ready for quotes? Talk to a local roofer in our network by phone.