What Size Hail Damages a Roof?

Quick answer: hail smaller than about ¾ inch rarely hurts a healthy asphalt roof, 1 inch (quarter size) is where genuine bruising starts, and 1¾ inch (golf ball) and up reliably causes the kind of damage insurance claims are made of. Size isn’t the whole story, though. Here’s how to read what a storm actually did.

Why size thresholds are only half the answer

Damage is energy meeting condition. Wind turns marginal hail damaging: 1-inch stones driven sideways at 50 mph hit far harder than the same stones falling straight. Density matters: thirty impacts per square in the sweet spot of a slope reads differently than three. Roof age matters most of all: a supple 8-year-old shingle absorbs a hit that bruises a brittle 22-year-old one (see how roofs age here). And soft-metal witnesses (gutters, vents, flashing) record the storm honestly even when shingles hide it.

Dane County sits in hail country: the cells that ride northeast across southern Wisconsin drop quarter-and-up hail somewhere in the county most summers. If it happened over your street, here’s what to look for.

What real hail damage looks like

On asphalt shingles, a hit is a bruise: a dark circle where granules were crushed off, exposing the mat, soft under a fingertip like a bruised apple. Fresh hits look almost shiny-black; the randomness is the signature. What hail damage is not: neat straight-line wear at tab edges (aging), uniform south-slope granule loss (sun), or blistering (manufacturing). Distinguishing these is exactly the job of a documented storm assessment.

Checking from the ground (stay off the roof)

After a storm, walk the property: dents in downspouts and gutters (soft aluminum records every decent stone); granule piles at downspout outlets; pocked deck rails, AC fins, window wraps, mailboxes; shingle debris in the yard. Ground evidence plus known hail size tells you whether a roof-level look is warranted. No dents anywhere and pea-sized stones? Your roof is almost certainly fine, and anyone insisting otherwise from your doorstep is selling.

The doorstep economy, briefly

Hail maps are public, and sales crews route by them; by day two, neighborhoods that caught a real storm are crawling with folding-table inspections. Some find real damage. Plenty “find” it regardless. The defense is sequence: independent assessment with photos first, then the claim-or-cash decision with your own evidence, then, if the damage is real, repair or replacement by someone who’ll still be local at warranty time.

Storm cross your neighborhood this week? Request an assessment. We photograph every slope, tell you which of the three buckets your roof is in (cosmetic, repair-sized, or claim-sized), and mean it either way.