How to Tell If Your Roof Has Hail Damage: What to Check From the Ground, the Gutters, and the Attic

QUICK ANSWER: Hail damage on a roof shows up as dented soft metals like vents, flashing, and gutters, dark round spots where granules were knocked away, soft bruises that feel like a bad spot on an apple, and in worse cases cracked or punctured shingles and fresh stains in the attic. Hail about one inch across, roughly the size of a quarter, is where real shingle damage starts to become common, though smaller stones can still loosen granules and age a roof early. Start with what you can see safely from the ground, check the gutters and downspouts for a sudden pile of granules, look at the attic ceiling with a flashlight, and have a roofer inspect the slopes that faced the storm. Many hail bruises do not leak on the first day, which is why a roof can look fine and still be hurt.

Most hail damage does not announce itself. A storm rolls through a Tuesday afternoon, the ice stops after ten minutes, the sun comes back out, and the roof looks about the way it did that morning. Then a winter passes, the freeze and thaw cycles of a Chicago area season work on the spots the hail bruised, and the first sign anyone notices is a brown ring on a bedroom ceiling.



We have walked a lot of roofs after storms in Northlake and the surrounding western suburbs, and the pattern repeats. The homeowners who catch hail damage early are rarely the ones who climbed up to look. They are the ones who knew which clues show up at ground level, in the gutters, and in the attic, and who knew that a roof can be hurt without any visible hole. This guide walks through those clues in the order we would check them, explains what is actually happening to the shingle when hail hits, and lays out what a careful inspection covers so you know what you are looking at when someone is on your roof.

What Hail Actually Does to a Roof

An asphalt shingle is not solid asphalt. It is a mat, usually fiberglass, coated with asphalt and then covered in ceramic coated mineral granules. The granules are the wearing surface. They shield the asphalt from sunlight and they give the shingle its color and some of its fire resistance. Roughly a third of a shingle's weight is granules, which tells you how much of the product depends on that surface staying in place.

When a hailstone strikes, the shingle has to absorb the energy of a falling chunk of ice. Three things can happen, and they matter in different ways.

Granule Displacement

The stone knocks granules loose and exposes the asphalt beneath. On its own this shortens the life of the shingle because the exposed asphalt weathers faster, but a shingle that is still mostly covered in granules usually keeps shedding water.

A Bruise, Or Fracture In The Mat

This is the damage roofers and engineers care about most. The impact cracks or crushes the fiberglass mat under the surface. The spot feels soft when pressed, much like the bruise on an apple, and the granules over it are often knocked away so the asphalt shows through. The mat is what holds the shingle together, so a fractured mat is a shingle that has lost strength at that point.

A Puncture Or Tear

With larger stones, older shingles, or shingles that sit over a hollow spot with little support underneath, the stone can break clean through. That one leaks right away.

The reason bruises are easy to miss is simple. Nothing falls off the roof. The shingle still sits where it was nailed, still overlaps its neighbors, and still looks like a shingle from the street. Over time, water works into the fracture, the asphalt oxidizes where the granules are gone, and the mat weakens until the spot cracks open.

Start on the Ground: Soft Metals Tell the Story First

Before anyone goes near a ladder, walk the property and look at everything hail would also have hit. Soft metal and painted surfaces record hail hits very clearly, and they are easier to read than shingles.

Roof Vents And Caps

Dented box vents, turbine vents, and plumbing caps can indicate damaging hail. Multiple dents concentrated on one side suggest stronger storm impact.

Gutters And Downspouts

Look for shallow, rounded dimples along gutters and downspouts. Dark, sand-colored granules near outlets can also indicate roof surface damage from hail.

Flashing, Drip Edge, And Ridge Caps

Fresh dents in flashing, drip edges, and ridge caps indicate impact. Bright spots where paint or oxidation disappeared can reveal recent hail strikes.

Air Conditioner Fins And Condenser Tops

Bent condenser fins and dimples across outdoor unit grilles can indicate hail damage. These components are vulnerable because their metal surfaces are relatively thin.

Window Screens, Siding, And Painted Trim

Torn screens, chipped paint, and pitted siding can reveal hail direction. Wind-driven hail often causes heavier damage on west- and south-facing surfaces.

Spatter Marks

Fresh hail can leave clean, lighter circles where ice removes dirt or weathering. Photograph these marks quickly becau

If the soft metals show few or no marks, that is a good sign, but it does not clear the shingles. Metal vents dent from smaller stones than it takes to bruise a shingle in good condition, and a shingle that is already old will bruise more easily than one that is new. A lot of dents does not guarantee shingle damage either. It does tell you that a roof inspection is worth doing.

Check the Gutters and the Yard

Granules wash off the roof into the gutters and out the downspouts. A small amount of granule loss is normal, especially on newer shingles that carry a little extra surface. A sudden dark, sandy pile at the base of a downspout after a hailstorm is different. It means the storm stripped granules from a roof in a short time.



Also check the lawn and the beds around the house. Leaves and small branches stripped from trees, and bits of broken roofing material, give you an idea of how hard the storm hit. A tree that lost green leaves in July, or one with a scarred trunk on its windward side, tells you the stones were significant.

On the Shingles: Real Bruises and Look Alikes

Seeing the shingles up close is the work of a trained person standing on the roof, but it helps to know what separates hail from the many other things that mark a roof. Roofing engineers who study this point out that inspectors and homeowners often mistake ordinary shingle anomalies for hail, so it is worth knowing both sides.

Signs That Point To Hail

A bruise is a roughly round dent, usually a half inch to an inch or two across, where granules are missing and the asphalt looks dark and fresh. When you press it with a gloved finger it feels soft or gives slightly. The marks sit in the field of the shingle, away from the edges, and they appear on every affected slope in roughly the same density. Fresh exposed asphalt looks black and unweathered, while asphalt that has been exposed for years looks gray and dull, which is one way to tell a new hit from an old one.

Fractures that radiate out from the impact point, or a visible hole, are clear hail damage on a shingle in good health.

Things That Get Mistaken For Hail

Blisters are small bubbles in the shingle surface, usually a quarter inch or smaller, caused by moisture or trapped gas during manufacturing, not by ice. Foot scuffs from people walking the roof leave a smeared patch of lost granules. Nail pops and fasteners driven too high push up under the shingle above and can leave a round mark that looks like an impact. Spots where shingles were stuck together in the bundle and pulled apart can leave a round bare patch. Aging itself produces cracking, cupping, curling, and general granule loss across the whole roof, with no pattern from the storm.

The difference is mostly pattern and location. Hail produces random, scattered hits across the slope, more of them on the sides that faced the wind, singular on each shingle, with matching marks on the soft metals. Wear tends to show on the sunniest slopes and along every exposure, regardless of the storm. A roofer who sees hail marks on the shingles and none on the vents, or the reverse, will keep looking until the evidence lines up.

Look From Below: The Attic and the Ceilings

Some of the best evidence is on the underside of the roof, and you can check it safely.

Use A Flashlight In The Attic

Use a flashlight to inspect the roof deck for dark stains, damp insulation, or wet wood. Check storm-facing slopes carefully, and note any unexpected light visible through the decking.

Check Around Penetrations

Inspect plumbing vents, chimneys, and skylights for signs of water entry. Storm damage can crack vent boots or bend flashing, creating openings where rainwater reaches the attic.

Look At The Ceilings

Check ceilings for brown rings, bubbling paint, or stains that expand after rainfall. These visible changes indicate water has traveled through roofing materials and reached the interior surface.

Notice Timing

Hail can fracture shingles without creating an immediate opening. Leaks may appear during later heavy rain or snowmelt, so stains appearing weeks or months afterward can still relate to storm damage.

Hail on Metal and Flat Roofs

Not every roof in the area is a shingle roof. Garages, additions, and many commercial buildings carry other systems, and hail affects each one differently.

Metal roofing dents more readily than it leaks. Standing seam panels and exposed fastener panels can show cosmetic dimpling that does not change how the roof sheds water, but hail can also loosen fasteners, bend seams, and damage coatings, so we check those details on top of the dents.

TPO and EPDM membranes can be punctured or bruised by large stones, particularly where the membrane sits over a soft insulation board that gives under impact. Small round divots, cracks in the membrane surface, and displaced or damaged seams are the points to examine. Ponding water on a flat roof makes any breach worse because water sits on it.

Modified bitumen shows hail as fractured or displaced granules on the cap sheet and, in more serious cases, as cracks through the surface layer that expose the base.

For commercial property managers, a flat roof that took hail should be checked even if nothing leaks, because the membrane, seams, drains, and rooftop equipment flashing can all be affected, and these systems are harder to evaluate by eye from the ground.

What a Proper Hail Inspection Looks Like

If you bring a roofer out after a storm, here is what a thorough check should include.

Every Slope, Not Just The One With The Stain

Inspect every roof slope, not only where staining appears. Comparing windward and leeward sides helps determine whether the damage pattern matches the storm's direction and overall impact.

A Test Square On Each Slope

Mark a ten-foot by ten-foot test area on each slope and count confirmed hail impacts. Consistent sampling provides a measurable comparison between roof sections instead of relying on visual estimates.

Soft Metals Documented First

Document dents in vents, gutters, and flashing before examining shingles. Their size, shape, and direction can provide useful evidence about hail size and the storm's direction of travel.

Differentiating Hail From Wear

Examine suspected damage carefully by checking exposed asphalt and pressing questionable areas. Rule out blistering, foot traffic marks, fastener damage, and normal weathering before identifying hail impacts.

Flashing, Boots, And Penetrations

Inspect pipe boots, flashing, and other roof penetrations for dents, cracks, or displacement. These components can sustain storm damage while remaining easy to overlook during a basic inspection.



Attic And Ventilation Review

Inspect the roof deck from inside the attic and review ventilation components. Evidence below the roof can help confirm exterior findings and reveal moisture problems that are not visible outside.

Photo Documentation

Take dated and clearly labeled photographs of each finding, including roof slopes, components, and interior evidence. Thorough documentation provides a useful record for repairs, inspections, insurance, or future decisions.

What to Do in the Days After a Storm

You do not need to rush onto the roof, but you also should not wait a season.

Photograph First

Document dents, granule piles, interior stains, and other visible evidence with dated photographs. Clear records can help establish when damage appeared and provide useful information during later inspections.

Stay Off The Roof

Avoid climbing onto the roof to inspect storm damage. Check from the ground, through accessible windows, or from the attic where conditions allow safer observation.

Control Active Leaks

If water enters the home, a temporary tarp installed by a roofer can limit further exposure. Inside, use buckets and move belongings away from dripping areas.

Schedule An Inspection While Evidence Is Fresh

Arrange an inspection soon after the storm. Fresh asphalt exposure and clean dents are easier to distinguish from older wear before weathering changes their appearance.

Do Not Assume The Answer

A roof may look intact while hidden fractures remain, while granule loss does not automatically prove damage. Neither condition can be confirmed accurately from the driveway alone.

Frequently Asked Questions

Reading Hail Damage Before Winter Makes It Worse

Hail rarely ruins a roof in a single afternoon. It leaves quiet damage that settles in through the next few seasons of rain, snow, and freezing nights. Knowing what to look for from the ground, in the gutters, and in the attic gives you a real head start. Dented vents, a pile of granules at a downspout, or a faint stain on a bedroom ceiling can each point to a roof that took more than it showed on the first day.

With 13 years of experience, DOGGOS ROOFING PLLC in Northlake, IL, has seen how often a roof that looked fine turned out to be hurt. An honest inspection separates real bruising from ordinary wear and tells you whether the roof came through the storm. Photographing early, staying off wet shingles, and checking every slope while the evidence is fresh all make that answer clearer. Acting before the freeze and thaw cycles begin keeps a small problem from becoming a larger one.