After a hailstorm, most roofs look fine from the driveway. No holes, no missing shingles, nothing obviously wrong. That is exactly why hail damage is one of the most missed problems in community associations. The damage that shortens a roof's life is usually the damage you cannot see from the ground. This page explains what hail actually does to an asphalt shingle, how to tell real damage from normal aging, and what your board should document.
This page covers asphalt specifically. For wind damage, for hail on metal, slate, wood, or a flat roof, and for the documentation protocol that applies across all of them, start with Wind and Storm Damage Recognition.
What hail does to a shingle
An asphalt shingle has two parts that matter here. The granules are the colored ceramic bits on the surface that shield the shingle from sun and weather. The mat is the fiberglass layer underneath that gives the shingle its strength. Hail damages both, in three ways:
- Granule loss. The impact knocks granules off, leaving a bare spot where the darker asphalt shows through. With the shield gone, the exposed asphalt breaks down faster under sunlight.
- Bruising. This is the one people miss. A hailstone can fracture the mat underneath without removing many granules. The surface looks close to normal, but the spot feels soft or spongy when pressed, like a bruise on a piece of fruit. Bruising is usually invisible from the ground.
- Cracking. Larger hail can crack or split the shingle outright, often with the break radiating out from the point of impact.
The common thread is that hail damage is often subtle and slow-acting. What looks cosmetic right after a storm can turn into brittle, cracking shingles and eventual leaks months or years later.
How to recognize it
Some signs are visible from the ground, but confirming hail damage on the shingles themselves almost always takes an on-roof look by someone who knows what to check. From the ground and the gutters, look for:
- A sudden, heavy deposit of granules in gutters and at the bottom of downspouts after a storm (not the light, steady grit of normal aging).
- Dents and dings in "soft metals," the roof vents, flashing, gutters, and downspouts. These soft metals are the clearest ground-level tell that hail was large enough to do damage, because they dent when shingles are also being struck.
- Spatter marks on painted or oxidized surfaces nearby, spots where hail knocked off a thin film of dirt or oxidation. Spatter helps confirm that hail actually fell and which direction it came from.
On the roof surface, a trained inspector looks for:
- Dark, roughly circular impact marks scattered randomly across the shingle face, with fresh dark or shiny asphalt showing through.
- Soft spots that give slightly when pressed, the signature of a fractured mat.
- Damage concentrated on the slopes that faced the storm rather than spread evenly over the whole roof.
In Minnesota, roughly one-inch hail (about quarter size) is the common threshold for taking asphalt damage seriously. Much of what falls here runs quarter to golf-ball size, which can leave real damage that only shows up on a close, roof-level look.
How a professional documents it: the test square
The industry method for recording hail on a roof is the test square, an approach developed by Haag Engineering and now standard practice. An inspector chalks off a square section of the roof, commonly ten feet by ten feet, on each slope. Every impact inside that square is marked and counted, which turns a vague impression ("this roof looks hailed") into a number that can be compared slope by slope and building by building.
A chalk rub across the surface makes shallow impacts easier to see and photograph, since the chalk catches on the disturbed granules and skips the intact ones.
Two things make this method worth knowing even for a board that will never run it:
- It is per-slope, not per-roof. Hail is directional. A north slope can be untouched while the west slope of the same building is heavily struck. Any assessment that reports one number for a whole property has flattened information your board needs.
- It produces a record that holds up. Marked, counted, photographed squares with slope and building noted are the difference between a documented condition and an opinion.
Hail damage versus normal wear
This is the distinction that protects a board from both overreacting and underreacting. Every asphalt roof loses granules slowly as it ages, and that steady thinning is not hail damage. The two look different:
| Feature | Hail damage | Normal aging |
|---|---|---|
| Pattern | Random, scattered, no relation to shingle edges | Uniform, gradual, spread evenly |
| Location | Concentrated on storm-facing slopes | Often worst on the sunniest slopes |
| Exposed asphalt | Fresh, dark, sometimes shiny | Gray, oxidized, weathered |
| Edges of bare spots | Sharp, distinct | Soft, feathered |
| Timing | Lines up with a specific storm date | No single event, just years |
A professional can usually tell the two apart on sight and with a simple press test. When the loss is random, scattered across multiple slopes, and paired with dented soft metals, it points to hail. When it is even, gradual, and edge-focused, it is most likely age.
Two other lookalikes are worth naming, because both get misread as hail. Blistering, small raised bumps that pop and leave a shallow crater, comes from moisture in the asphalt and appears in a pattern unrelated to any storm. Foot-traffic damage, from service technicians walking a roof, tends to run in lines and concentrate near rooftop equipment rather than scattering randomly.
What it means for your association
Hail brings a few concerns that are specific to associations, where one storm can touch many buildings at once.
Damage is directional, so it is uneven across the property. Because hail is driven by wind, some buildings or slopes can be badly hit while others a hundred feet away are untouched. A property-wide assessment matters more than checking one representative building.
Confirmation takes an on-roof inspection. The most consequential damage, bruised mats and broken granule bonds, is invisible from the ground. Ground-level photos alone will NOT tell your board whether the roofs are compromised.
Keep a clear record. If hail is suspected, document it thoroughly: the storm date, ground-level photos of dented gutters and vents, and a professional's on-roof findings noted slope by slope and building by building. That record is what every conversation afterward runs on.
Keep people off the roof. Walking a hail-struck roof to look for damage is a job for professionals with fall protection. Board members and residents should stay on the ground.
How we work with your board
TruPoint is on the association's side of the table. We document condition, we work with your carrier on the board's behalf, and we bring in a licensed professional, an attorney, an engineer, or another specialist, when the situation calls for one.
The materials angle: impact-rated shingles
When hail damage leads to a roof replacement, the material choice becomes a live question, so it is worth understanding the one spec that measures hail resistance.
Impact resistance for roofing is rated by a standard called UL 2218. A steel ball is dropped onto the shingle from a set height to mimic a hailstone's force, and products earn a class from 1 to 4. Class 4 is the highest: a two-inch steel ball dropped from twenty feet, struck twice in the same spot, with no cracking or rupturing through the back (cosmetic denting is allowed).
Class 4 impact-rated shingles are made by several national manufacturers, typically using more flexible, modified-asphalt formulations, and generally cost somewhat more than standard architectural shingles. Whether the upgrade earns its cost for your association depends on your carrier's credit, your reserve schedule, and what the rating does and does not cover. See the impact-resistant (Class 4) shingles section of our Asphalt Shingles guide for that full assessment.
Take the next step
If a storm has moved through, or if your roofs are aging and you want a documented baseline before the next one, the productive move is a professional on-roof assessment that records condition slope by slope. Waiting for a visible leak means waiting past the point where the damage was easy to document.
Send us the property address and the storm date, and we will walk the roofs, document what is actually there, and help your board decide what comes next. The Post-Storm Documentation Checklist is available in the meantime so your board has a consistent record to work from after any hail event.
Sources and further reading
- Insurance Institute for Business & Home Safety (IBHS), "Relative Impact Resistance of Asphalt Shingles": ibhs.org (Opens in a new tab)
- UL Solutions, UL 2218 impact resistance standard: ul.com (Opens in a new tab)
- NOAA National Weather Service, severe hail information: weather.gov (Opens in a new tab)
- Haag Engineering, origin of the roof test-square inspection method (named for reference)
- Manufacturer specifications for UL 2218 Class 4 impact-rated shingles (compare products by their published class rating).