Wind vs. Hail Damage: How to Tell Them Apart on a Roof

"Storm damage" on a roof is almost always one of two perils — wind or hail — and they are not interchangeable. They hit the roof in different places, leave different marks, and get written up as different line items. Call a creased shingle "hail" or a hail bruise "wind" and you've handed the adjuster a reason to question the whole file. Worse, you may scope the repair wrong and leave money — or a leak — on the table.

Here's how to tell wind damage from hail damage on an asphalt-shingle roof, why the two get scoped differently, and how to document each so it holds up with a carrier.

Wind vs. hail at a glance

Feature	Hail damage	Wind damage
Force	Impact from above	Uplift and tearing at edges and seams
Where it concentrates	Open field of the slopes that faced the storm	Rakes, ridges, eaves, corners, and the windward slope
Signature	Round bruises, knocked-loose granules, fractured mat	Creased or folded tabs, lifted or missing shingles, broken seal strips
The mat underneath	Fractured at the impact — that's the functional damage	Intact, but creased or torn along the fold line
Pattern	Random scatter, directional toward the storm	Directional with the wind, heaviest at edges and transitions
Collateral	Dented gutters, downspouts, vents, A/C fins	Displaced ridge caps, lifted flashing and drip edge, debris, fence and fascia damage
Ties to the record	Matches a dated hail report in the NWS record	Matches a dated high-wind or gust report in the NWS record

That table is the whole article in miniature. The sections below are the same logic with the reasoning behind it.

What wind damage actually looks like

Wind doesn't press evenly on a roof. It accelerates over the ridge and curls around the rakes and corners, creating uplift — negative pressure that pulls shingles up, not down. That's why wind damage clusters at the edges and the windward slope while the center of a slope can look untouched.

The sequence is mechanical. Wind gets under the leading edge of a tab, breaks the adhesive seal strip that bonds it to the course below, and lifts it. If the gust is strong enough, the shingle folds back on itself and either tears off or flops back down. The shingle that flops back down is the one that fools a ground-level look: it's lying flat again, but the seal is broken and the mat is creased — a fracture line across the tab where it folded. That crease is functional damage. The shingle will fail there, and it's no longer sealed against the next wind.

The signatures to look for:

• Creasing or folding — a horizontal fracture line across a tab where the wind bent it. Lift the tab; a crease won't lie back down cleanly and the seal is gone.
• Lifted or unsealed tabs — shingles you can raise by hand with no resistance because the seal strip let go.
• Missing shingles — blown off entirely, exposing the underlayment or deck. Often along a rake, ridge, or the windward eave.
• Torn or split tabs, especially around penetrations and at hips and ridges where caps take the most uplift.

Then confirm it with collateral, the same way you would for hail — just different collateral. Wind strong enough to crease shingles also displaces or cracks ridge caps, lifts step and counter flashing, peels back drip edge, throws debris, and bends fascia and gutters at their fasteners. Look at the neighbors, too: a row of houses with missing shingles down the same slope is a wind pattern you can stand behind.

What hail damage looks like (the short version)

Hail is the opposite geometry: an impact from above that lands in the open field of the roof, not at the edges. A genuine hail strike leaves a soft, round bruise where the granules are knocked loose and the fiberglass mat underneath is fractured — press it and it gives, like a bruise on fruit. The distribution is random and directional, heavier on the slopes that faced the storm, and it shows up on soft metal as dents: gutters, downspouts, vents, valley metal, and the aluminum fins on the A/C condenser.

We go deep on the hail signatures — and the look-alikes that fool quick inspections — in hail damage vs. blistering and in our guide to documenting hail damage for a claim. The one line to keep here: hail bruises the field and dents soft metal; wind creases the edges and breaks seals. They rarely look alike once you know where to stand.

Why the two get scoped differently

This is where calling the right peril actually matters in dollars.

A hail claim turns on density and severity. You chalk a 10' × 10' test square on the worst-facing slope, count the functional impacts, and that count — bruises with mat fracture, not cosmetic marks — is what supports repair versus full replacement. The argument is "how much real damage per square."

A wind claim turns on creasing, missing shingles, and repairability. The pivotal question an adjuster asks on a wind loss is whether the damaged shingles can be replaced without destroying the good ones around them. To slide a new shingle in, you have to lift the course above it. On an aged or hard-sealed roof, lifting the surrounding shingles cracks them — so a "spot repair" creates more damage than it fixes. That's the brittleness, or repairability, test, and when a roof fails it, the scope moves from a handful of shingles toward the full slope or roof. Matching matters too: if the shingle is discontinued and can't be matched, many policies and some state rules support broader replacement.

So the peril you name drives the documentation you need. Mislabel a wind loss as hail and you'll go looking for a test-square count that isn't there; mislabel hail as wind and you'll skip the soft-metal collateral that proves the claim.

How much wind it takes

Asphalt shingles carry wind ratings — ASTM D3161 (Class A/D/F to 60/90/110 mph) and ASTM D7158 (Class D/G/H to 90/120/150 mph) — but those numbers describe a new, properly sealed shingle in a lab. A shingle whose seal has already let go, or one that's a decade into a hot attic, fails far below its rating. That's why a 55–60 mph gust can strip an old roof and barely touch a new one next door.

For grounding the date of loss, the National Weather Service treats 58 mph (50 knots) as the severe-thunderstorm wind threshold, and microbursts can briefly hit 100+ mph in a footprint a few hundred yards wide. Anchor the loss to the record the same way you would for hail: pull the dated wind or gust report from NOAA's Storm Events Database before anyone files. Our storm-season field checklist walks through the date-of-loss step.

The look-alikes worth knowing

A few non-peril confusers get written up as wind by inspections that move too fast:

Installation defects. Shingles nailed too high, overdriven, or installed in cold weather may never seal properly and lift in ordinary wind. That's a workmanship issue, not a storm peril — and it's often visible in the nailing pattern.

Thermal curling and cupping. Old shingles curl and cup at the edges from years of heat cycling. It photographs like lifting, but it's uniform across the roof and tied to age, not to a dated storm.

Foot-traffic creases. A crease along a walk path or below a penetration is usually someone's boot, not the wind. Wind creases follow the windward exposure and the edges; traffic creases follow where people step.

When it's both

The supercell that drops hail usually arrives with damaging wind, and a microburst can pair straight-line wind with hail in the same ten minutes. So you'll frequently document both perils on one roof — hail bruising across the field and creased, missing shingles along the windward rake. Write them up separately. They're different line items, the adjuster evaluates each on its own evidence, and a roof can qualify on one peril, the other, or both. Don't let a single-peril mindset — yours or the adjuster's — quietly drop half the claim.

How to document each so it holds up

Photograph damage the way it'll be judged — a tight close-up and a wide shot that locates it on the roof — and split your evidence by peril.

For wind: lift the creased or unsealed tab and shoot the broken seal strip and the fold line; capture missing shingles with the exposed underlayment; show the windward slope and every edge transition; and photograph the collateral — displaced caps, lifted flashing and drip edge, fence and fascia. Do a hand-seal check on a few shingles and document whether they lift without resistance.

For hail: chalk a 10' × 10' test square and count functional impacts, shoot the soft-metal collateral, and show the granule loss and mat fracture with a size reference. Keep GPS and timestamps on, and anchor the date of loss to the weather record before filing. HAAG Engineering's field research and the IBHS are solid references when a homeowner wants to understand what each peril actually does.

Where AI helps — honestly

Sorting wind from hail across a 150-photo storm set is exactly the kind of fast, repetitive read where a consistent second opinion earns its keep. Roof Diagnose names the signature in each photo — hail bruising versus wind creasing, lifting, and missing tabs — grades severity, and frames the low-confidence calls as "verify on-site" rather than asserting them.

The honest caveat matters here more than usual: the wind claim often turns on the seal and brittleness test, and no photo tool can lift a shingle and feel whether the one next to it cracks. Use AI for the fast first pass and the write-up; make the repairability call and the final read with your own hands on the roof. That's the posture that keeps your files clean and your credibility intact — AI-assisted, verified on-site.