The result depends on the hailstone’s mass, hardness and speed, wind-driven impact angle, roof slope, roof-cover material, substrate and the exact point of impact. Asphalt shingles can dent, tear and lose granules; metal commonly dents, while functional damage depends on whether seams, coatings, flashings or other details are compromised.
Two houses across the street can go through the same Clovis thunderstorm and come away with different roof conditions. One may have obvious dents in metal vents and little shingle damage. Another may have concentrated impacts on a wind-facing slope. A third may have an older brittle roof that responds differently from a newer flexible product.
That variation is why hail damage is frequently misunderstood. People want a simple rule—quarter-size hail is harmless, golf-ball hail means replacement, metal is hail-proof, Class 4 cannot be damaged—but real roof performance is more complicated. Research from the Insurance Institute for Business & Home Safety looks at hailstone strength, diameter, mass, velocity and impact behavior because all of those factors influence what happens when ice strikes a roof.
The physics: hailstones do not all hit a roof the same way
The energy delivered by a hailstone is influenced by its mass and speed. Larger stones generally carry more potential impact energy, but size alone is incomplete. Natural hailstones vary in density and hardness. IBHS field research documents that hail can bounce, shatter or turn to slush on impact, and those modes affect how energy is transferred to the roof surface.
Wind changes the situation again. Standardized laboratory tests often use controlled impacts, while natural hail may strike a roof at an angle because of strong thunderstorm winds. Roof pitch also changes the effective angle. A steep roof face receiving wind-driven hail can experience a different impact pattern than a sheltered slope on the same house.
Eastern New Mexico thunderstorms can combine hail with strong straight-line or downburst winds. The National Weather Service notes that New Mexico summer thunderstorms can produce damaging downbursts, so an inspection should consider wind and hail together rather than looking only for round impact marks.
How hail affects asphalt shingles
An asphalt shingle is a layered product. The visible surface includes mineral granules embedded in asphalt over a reinforcing mat. Those granules provide color and help shield the asphalt from ultraviolet exposure. When hail strikes, the damage mode can vary.
GAF technical guidance notes that hail-related damage may appear as random indentations or fractures and that some effects may become more visible over time as granules loosen at an impact location. That does not mean every missing granule is hail damage. Shingles naturally shed some granules, and foot traffic, manufacturing variation, blistering and age can create marks that look suspicious in photographs.
Why a “bruise” is not diagnosed from the driveway
A dark spot on a shingle is not enough to determine what happened. The inspector needs to look at pattern, distribution, orientation and roof-wide context. Are marks random or aligned with foot traffic? Are soft-metal components dented in the same storm-facing areas? Are there tears or fractures at representative impacts? Are marks fresh or weathered?
Good storm evaluation is comparative. It looks for a consistent story across the roof and property rather than treating one ambiguous mark as proof.
How hail affects metal roofing
Metal reacts differently because it is a ductile sheet or formed component rather than a granule-surfaced asphalt product. The most visible hail effect is often denting. IBHS notes that metal roof covers can be dented by hail and that visible dents do not automatically mean the roof has lost its water-shedding function.
That distinction between cosmetic and functional damage is important. Functional concerns can involve open seams, punctures, damaged locks, displaced clips or fasteners, cracked coatings at severe deformations, damaged flashings, or compromised penetrations. A shallow dent in the middle of a sound panel may be an appearance issue; damage at a seam or transition deserves a different level of attention.
Panel profile, metal thickness, substrate support and roof geometry influence denting. Preformed shapes can concentrate stress differently from flat panel areas. No metal roof should be sold as “hail proof.”
What about vents, flashings, gutters and skylights?
Roof accessories can become some of the clearest storm witnesses. Thin metal vents, chimney caps, gutters and downspouts often show impact dents. Flashing can be bent or displaced. Plastic components may crack. Skylight glazing can chip, fracture or fail depending on the product and impact.
These clues help establish storm exposure, but each component still has to be assessed for its own function. Replacing a dented vent does not necessarily mean replacing the entire roof, and a roof can have shingle damage even when the gutters look relatively normal.
Why older roofs and newer roofs can respond differently
Roofing changes with weathering. Asphalt shingles experience sunlight, heat, cold, moisture and mechanical stress over time. IBHS operates a Roof Aging Farm specifically because real-world aging affects material behavior and hazard performance.
An older shingle may be less flexible than when it was new. Sealant performance can also change. A roof that has already experienced multiple hail and wind events can have a different damage threshold than a freshly installed roof. That is another reason age is context, not a diagnosis.
What “Class 4” and impact-resistant labels actually mean
Impact-resistance ratings are useful, but they are not warranties that natural hail cannot damage a product. UL 2218 is a laboratory impact test used for certain roofing products. A Class 4 result indicates performance under the specified test conditions; it does not recreate every natural hailstone, wind speed, impact angle or storm duration.
IBHS has developed additional asphalt-shingle testing designed to better represent real hail damage modes such as dents, tears and granule loss. Their published ratings demonstrate that products carrying similar marketing labels can perform differently.
Use ratings to compare tested products, then consider the complete roof assembly, installation details, warranty language and your tolerance for cosmetic versus functional damage.
How wind and hail can work together
A roof may show more than impact marks after a severe thunderstorm. Wind can lift or crease shingles, break adhesive seals, loosen edge materials, displace ridge components and stress metal trim. Hail can strike those same areas during the event. Later, a homeowner may see a missing shingle and assume hail removed it when wind was the main mechanism.
The repair scope should follow the actual observed failure. If shingles are creased or displaced, wind damage may be central. If random impact marks and granule displacement dominate, hail may be the bigger issue. If both are present, the inspector should document both.
What a useful hail inspection looks for
- Overview condition of each roof slope and orientation.
- Representative shingle impact marks, tears, fractures or concentrated granule loss.
- Wind creases, lifted tabs, missing shingles and edge/ridge damage.
- Dents or damage on roof vents, flashing, gutters, downspouts and other exposed metal.
- Metal-panel dents plus seam, fastener, coating and penetration condition.
- Skylights, pipe boots, chimneys and roof-to-wall transitions.
- Interior or attic evidence of water entry when safely accessible.
- Older wear or installation defects that should not be mislabeled as storm damage.
Documentation should show both close-ups and wider context. Twenty extreme close-up photos with no location reference make it hard to understand whether marks are isolated or widespread.
Can hail damage a roof without making it leak today?
Yes. A roof can experience hail-related surface damage without immediate water entry. That is particularly true when impacts affect protective layers but do not create an open path through the assembly. Conversely, a roof can leak after a storm because wind displaced flashing or shingles even if hail impacts are minor.
This is why “no leak” is reassuring but not a complete post-storm assessment after a significant event.
Common hail myths
Myth: if the car was not damaged, the roof is fine.
Different materials, shapes and impact angles respond differently. Vehicle condition is not a roof test.
Myth: every hail dent on metal is functional damage.
No. Denting can be cosmetic. Seams, fasteners, coatings and water-shedding details determine whether function is affected.
Myth: impact-resistant shingles cannot be damaged.
They can. Ratings represent performance in specific tests, not immunity from every natural storm.
Myth: you can identify hail damage from one phone photo.
Usually not responsibly. Pattern and roof-wide context matter.
Myth: a storm automatically means you should file an insurance claim.
That is a policy and financial decision. First understand the property condition; then review your policy and speak with your carrier if needed.
What Clovis homeowners can do before the next hailstorm
Keep roof-maintenance records and dated photographs. Address loose flashings, open seams and deteriorated penetrations before storm season. When replacement time eventually arrives, compare product-specific impact and wind information rather than relying on broad material claims. Keep trees maintained where appropriate and ensure drainage systems are clear.
Most importantly, know what your roof looked like before the storm. Baseline photos and inspection records make post-storm changes much easier to identify.
For immediate post-storm steps, read What to Do After Hail Damage in Clovis. For service information, visit Storm & Hail Damage Roofing in Clovis, NM.
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Sources & further reading
We use manufacturer, roofing-industry and weather-service guidance as reference points, then apply it to the conditions Clovis-area property owners actually deal with.