Damage or Just Age

Separating Legitimate Hail Impact From Granule Loss Blistering Foot Traffic and Manufacturing Defects

Sunday, May 31st, 2026 Claims Pages Staff After the Hail Stops

An adjuster I worked with early in my career had a habit of repeating the same warning every time we pulled up to a roof.

A roof will show you anything you want to see if you go up there wanting to see it.

He was right. Climb up looking for a total loss and every dark spot becomes a hail hit. Climb up looking to deny and every genuine impact becomes a manufacturing quirk. The discipline of telling real damage from ordinary age is the discipline of wanting to see what is actually there, nothing more and nothing less.

That neutrality cuts both ways, and that is the part adjusters sometimes forget. Calling age damage cheats the carrier and invites a roof to fail prematurely with no coverage. Calling damage age cheats the policyholder out of a claim they paid premiums to have honored. An honest read protects both sides. This article is a field guide to the most common things that get mistaken for hail, and how to tell them apart on the roof.

What real hail damage looks like

Start with the genuine article so you have something to compare against. Functional hail damage to an asphalt shingle has a recognizable signature:

• Randomness. Hail falls without a pattern. Genuine impacts are scattered irregularly across a slope, not lined up or evenly spaced.
• Directionality. A storm comes from a direction, so damage concentrates on the slopes and the soft metal facing that direction. The roof should agree with the gutters and vents.
• A fractured mat. A true hit bruises the shingle and fractures the fiberglass mat beneath the surface. Press it and you feel a soft give, like pressing a bruise on fruit.
• Granule loss at the point of impact. The strike knocks granules loose exactly where it landed, exposing the asphalt in a small crater rather than thinning the whole field evenly.
• Size correlation. The impacts match the size of the hail evidenced on soft metal. Pea-size spatter and golf-ball craters do not belong on the same roof from the same storm.

When those traits line up, you are looking at hail. When they do not, you are probably looking at one of the imposters below.

Imposter one, normal granule loss from age

Asphalt shingles shed granules their entire lives. It is how they age. Over many years the surface thins, the asphalt below becomes more exposed, and the roof gradually loses its protective layer. Inexperienced eyes see bare asphalt showing through and assume impact.

The tell is distribution. Age-related granule loss is broad and even. It covers the field of the slope in a general way, often heavier on the sun-facing slopes, and it has no craters and no fractured mat underneath. There is no soft spongy give when you press it. It is just a tired roof. Hail granule loss, by contrast, is concentrated in discrete impact points with damage to the mat below each one.

Imposter two, blistering

Blistering is one of the most common false positives in the entire trade. It happens when gases or moisture trapped in the asphalt during manufacturing or from heat expand and pop small bubbles in the shingle surface. When a blister pops, it leaves a small round open spot that can look startlingly like a hail hit at a glance.

Several traits give blistering away:

• The spots are typically smaller and more uniform in size than hail impacts.
• They appear across the slope without regard to storm direction, often heaviest on the hottest slopes.
• There is no fractured mat beneath. The damage is shallow and confined to the surface.
• The openings often have a rounded, almost crater-like edge from the popped bubble rather than the irregular bruise of an impact.

Blistering is a maintenance and product issue, not a storm loss. The danger is that there is often a lot of it, and a contractor counting blisters as hits can build an impressive but false damage count.

Imposter three, mechanical and foot traffic damage

People damage roofs. Installers, other contractors, satellite dish technicians, chimney sweeps, and curious homeowners all leave marks. Mechanical damage has a signature that is almost the opposite of hail. Where hail is random, foot traffic is patterned and purposeful.

Look at the location. Mechanical damage concentrates where people step and work. The path from the access point, the route to a chimney or a vent, the ridge line where someone walked the peak. Scuff marks, shingles knocked askew, and granule loss in a line or a footprint shape all point to traffic rather than weather. A directional, located pattern is the giveaway. Hail does not walk to the chimney.

Imposter four, manufacturing defects

Sometimes the shingle was flawed before it ever left the plant. Manufacturing defects can cause cracking, surface irregularities, adhesion failures, and patterned blemishes. The hallmark of a defect is repetition. Manufacturing happens on a line, so defects often repeat at regular intervals or appear in a consistent way across many shingles from the same lot.

When you see the same flaw showing up at predictable spacing or in a uniform manner across the roof, think product rather than peril. Hail has no factory and no pattern. A repeating, regular defect distribution is nature's way of telling you the storm did not do this.

Imposter five, the catch-all of weathering

Beyond clean categories, roofs simply weather. Thermal cycling cracks aging shingles. Curling and clawing appear as shingles lose their oils and pull at the edges. Algae streaking discolors the surface. None of these are storm damage, and all of them tend to show up on the same older roofs where a homeowner is most motivated to find a covered reason for replacement.

The unifying principle is the same one running through every imposter. Weathering is broad, gradual, and unrelated to a single event. Hail is discrete, recent, and tied to a storm you can corroborate. When you find yourself uncertain, ask whether the condition tells the story of one bad afternoon or many slow years.

A side-by-side comparison

It helps to see the signatures next to each other. The table below summarizes how genuine hail differs from the conditions most often mistaken for it. Use it as a quick mental checklist on the roof rather than a substitute for testing each mark.

The tactile test that settles most arguments

If you remember one physical technique from this article, make it the press. Genuine functional hail damage fractures the mat, and a fractured mat gives under your thumb with a soft, spongy yield. Most imposters do not. Blisters are shallow. Age loss is firm. Defects are usually surface level. Foot traffic scuffs the granules without that deep bruise.

Press the questionable spot. Feel for the give. Then check whether it agrees with the soft metal, the storm direction, and the randomness test. A mark that is soft, random, directional, and size-consistent with the gutters is hail. A mark that fails those checks is something else, no matter how much it looks like a hit from across the slope.

Holding the line in both directions

The reason this skill matters so much is that the pressure almost always runs one way, toward finding more damage. The contractor wants the job, the homeowner wants the new roof, and the count of marks keeps climbing. Your job is to be the one person on the roof who distinguishes the eight real impacts from the forty circled spots a storm-chasing crew marked, and who is equally willing to confirm real damage that a stingy first look might have missed.

That is what neutrality looks like in practice. You are not the denial adjuster and you are not the approval adjuster. You are the person who reads the roof honestly, names each condition for what it is, and documents the difference so clearly that a reviewer can follow your logic from the photographs alone.

The takeaway

Damage or just age is the question underneath almost every contested hail claim, and the answer lives in the details. Real hail is random, directional, mat-fracturing, and consistent with the soft metal. Granule loss, blistering, foot traffic, and defects each carry their own signatures that give them away once you know what to look for. Go up wanting to see what is actually there, press the questionable spots, and let the roof tell you the truth rather than the story you or anyone else arrived with.