Iowa sits squarely in hail country. A single spring or summer storm can pepper your roof with hail that shortens its lifespan — often without any obvious leak right away. Here's how to tell whether your roof took a hit, and what to do about it.
Hail rarely punches a hole in your roof. Instead, it bruises shingles and knocks off the protective granules, leaving soft spots that fail months or years later. Because you usually can't see this from the ground, a lot of hail damage goes unnoticed until it's costly.
Not every hailstorm harms your shingles — size matters. Most roofers and insurers use roughly one inch of diameter (about quarter-sized) as the informal threshold where functional damage to asphalt shingles begins. A rough guide:
Wind speed, hail shape, roof age, and shingle type all change the outcome, so a smaller storm on a 15-year-old roof can still do real harm. When in doubt, have it looked at.
The roofing material changes what damage looks like. On asphalt shingles, hail knocks off granules and can fracture the fiberglass mat underneath, quietly shortening the roof's life. On a metal roof it's usually different: hail tends to leave cosmetic dents in the panels while the roof keeps shedding water just fine. Metal rarely cracks, splits, or develops holes from a normal hailstorm, so its waterproofing typically stays intact even when the surface shows dimples — an important distinction at claim time, which we cover below.
You don't need a ladder — and you shouldn't get on the roof yourself. Most warning signs are visible from ground level. Walk your property and check:
If several of these boxes get checked, book a professional inspection. Leave the actual rooftop walk to a licensed roofer with the right safety gear.
This is the part that trips up most homeowners. A hail-struck roof usually won't leak right away. When a hailstone hits hard enough, it fractures the fiberglass mat beneath the surface — the shingle may still look intact, but that hidden bruise is now a weak spot. At the same time, the impact strips the protective granules that shield the asphalt from the sun.
Over the next one to two Iowa summers, UV exposure oxidizes that bare asphalt and makes it brittle. Add our freeze-thaw winters, and those bruised, granule-stripped spots eventually crack and split. A roof that should have lasted 25 years can start failing in 10 to 15 instead — often with the first ceiling stain appearing long after the storm that caused it. That's why it pays to document damage now, while the cause is fresh.
Insurance adjusters look for a density of hail “hits” across a test area, bruising that breaks the shingle's mat, and fresh (not old) damage. A thorough, documented inspection from a reputable roofer gives you exactly the evidence you need.
In practice, adjusters often chalk off a 10-foot by 10-foot “test square” on each slope and count the functional impacts inside it. Many carriers use a threshold of roughly six to eight qualifying hits per square to decide whether a slope warrants repair or full replacement. They're looking for granule displacement with a clear crater, a soft “spongy” spot where the mat fractured, and fresh, dark asphalt.
Functional damage compromises the roof's ability to shed water: a fractured shingle mat, displaced or torn tabs, or granule loss severe enough to expose the asphalt. Cosmetic damage affects appearance but not performance — surface scuffs or minor dents on metal accessories that don't change how water runs off.
That difference matters because many policies treat the two very differently. Functional shingle damage is commonly covered, while purely cosmetic damage — like dimples on an otherwise watertight metal roof — is often excluded. Every policy is different, so we won't promise what yours will or won't pay. What we can do is inspect thoroughly, document clearly, and give you an honest read on whether the damage looks functional or cosmetic — so you can decide before you file.
Stay off the roof yourself. Instead, take dated photos of any visible damage and call a local, licensed roofer for a professional inspection. Passion Exteriors provides a free hail-damage inspection and a detailed written report you can submit to your insurer. You file and manage the claim directly with your insurance company — we're simply your roofing expert on-site to document the damage and walk your adjuster through the needed repairs. Learn more about our storm & repair services. If a storm just rolled through, our step-by-step storm damage guide covers exactly what to do first.
After a big Iowa storm, out-of-state crews flood neighborhoods with high-pressure pitches, then disappear before any warranty work is needed. Choose a local, family-owned contractor with a real address and verifiable reviews — your roof is only as good as the company standing behind it.
Functional damage to standard asphalt shingles generally starts around one inch — roughly quarter-sized hail. Tougher architectural shingles may hold up closer to 1¼ inches. An older or already-worn roof can take damage from smaller stones, so size is a guide, not a guarantee.
Yes — and that's the norm, not the exception. Hail fractures the shingle mat and strips granules, creating hidden weak spots that often don't leak until they crack years later, after sun and freeze-thaw cycles wear them down. Document damage soon after the storm.
Do a ground-level walk-around. Look for granules piling up below your downspouts, dents in gutters and metal vents, dinged siding or screens, and pockmarks on cars, decks, and fences. If several show up, book a professional inspection rather than climbing up yourself.
Often, yes — for functional damage that affects how your roof sheds water. Purely cosmetic damage, like dents on a still-watertight metal roof, is frequently excluded, and every policy differs. We can't promise what your carrier will approve, but a documented inspection gives you the evidence to have that conversation with confidence.
Sooner is better. Fresh damage is easier to tie to a specific storm, and most policies have time limits for filing a claim. A prompt, documented inspection protects your roof and your options.
👉 Hit by a storm? Call (319) 536-1924 or request your free inspection. Proudly serving Dubuque and all of Eastern Iowa & Illinois.
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