Storm Damage & Insurance

Hail Damage on Roofs: What Knoxville Homeowners Need to Know

Updated October 2026 · 5 min read · By the Knoxville Roofing Quotes team

East Tennessee gets its share of hailstorms. The National Weather Service office in Morristown says large hail around here peaks in May, with a smaller bump in November. Some storms are barely noticeable. Others sound like someone's dumping gravel on the house. After the noise stops, you're left wondering whether your roof just took real damage.

Hail damage isn't always what people think. Here's what's actually happening up there, and what to do next.

What Hail Actually Does to Shingles

When hail hits an asphalt shingle, it can cause a few different types of damage:

Granule Loss

This is the most common. The impact knocks loose the protective granules on the shingle surface. You might notice dark spots where the underlying asphalt is exposed. Those granules end up in your gutters.

Why it matters: Granules protect the shingle from UV damage. Without them, the shingle deteriorates faster. Not an emergency, but it shortens roof life.

Bruising

The impact compresses the shingle, weakening the fiberglass mat underneath. You can sometimes feel this as a soft spot when you press on the shingle. From the ground, it's nearly invisible.

Why it matters: Weakened shingles are more likely to crack or fail over time. Again, not immediate disaster, but long-term damage.

Cracking or Punctures

Larger hail (golf ball and up) can actually crack shingles or punch holes through them. This is the serious stuff that needs immediate attention.

Why it matters: Holes in your roof = water gets in. This needs to be fixed fast.

The Size Question

The National Weather Service calls a thunderstorm severe when it produces hail at least 1 inch across, about the size of a quarter. Its size guide is handy when you're reading storm reports or describing what fell at your house:

Pea: under 1/2 inch
Marble: 1/2 inch
Quarter: 1 inch (severe-storm threshold)
Ping pong ball: 1 1/2 inches
Golf ball: 1 3/4 inches
Baseball: 2 3/4 inches

Size isn't the whole story. Whether shingles are damaged also depends on their age and condition, the type of shingle, and the wind. Wind-driven hail strikes harder and at an angle. That's why a professional inspection matters more than the size of the stones you found in the yard. To see what was reported near you, our East Tennessee hail season guide explains how to look up official storm reports.

What to Check After a Storm

Don't climb on your roof – that's dangerous and unnecessary. Here's what you can check from the ground:

Gutters and Downspouts

Look for dents. Aluminum gutters show hail damage clearly. If they're beat up, your roof probably took some hits too.

Outdoor AC Unit

The fins on your AC compressor dent easily. If they look hammered, the hail was significant.

Soft Metals Around Your Home

Mailboxes, car hoods, window frames. Dents here indicate damaging hail.

Shingles (From the Ground)

With binoculars, look for obvious missing pieces, dark spots, or areas that look different from the rest. But honestly, real hail damage assessment requires being on the roof.

The Storm Chaser Problem

A warning: after a significant hailstorm, door-to-door crews often show up offering free inspections, sometimes from out of state. Tennessee's Department of Commerce and Insurance (TDCI) warns homeowners to be wary of door-to-door roofing solicitations and not to be pressured into signing on the spot.

Some of these companies are legitimate. Many are not.

The shady ones use high-pressure tactics, exaggerate damage, and try to get you to sign contracts on the spot. They might do the work and disappear before you realize there are problems. When you need warranty service, good luck finding them.

Red flags:

They knocked on your door unsolicited
They pressure you to decide immediately
They offer to waive or "cover" your deductible. Your deductible is part of your policy, and an estimate padded to hide it can cause trouble with your insurer
They want you to sign over your insurance claim rights
They can't show a Tennessee license you can verify on the state's license search
They want a big payment up front. TDCI says state law limits home improvement deposits to one-third of the contract price

Stick with established local contractors you can check out. If insurance is paying, Tennessee law also gives you specific contract protections; see your rights when insurance pays for a roof.

When to File an Insurance Claim

Not every hail event justifies a claim. Here's how to think about it:

File a claim if:

A reputable contractor confirms significant damage
Damage exceeds your deductible substantially
You have functional damage (not just cosmetic)

Think twice if:

Damage is minimal or cosmetic
Repairs would cost less than or near your deductible
You've filed other claims recently

Claims history can affect your premiums and renewal, so if you're unsure, ask your agent how a claim would be handled. Don't wait too long to decide, though: TDCI advises filing as soon as possible because policies can have notification deadlines.

The Inspection Process

A legitimate hail damage inspection works like this:

Contractor gets on the roof (safely, with proper equipment)
They look for impact marks in a systematic pattern
They document damage with photos
They check soft metals (vents, flashing) for comparison
They give you an honest assessment – maybe it's bad, maybe it's not

A good contractor will tell you when damage doesn't warrant a claim. Our roof inspection page covers what a thorough inspection should include.

Impact Resistant Shingles

If you're replacing your roof anyway, ask about impact-resistant shingles. They're rated under the UL 2218 impact test, where Class 4 is the highest rating; for Class 4, a 2-inch steel ball is dropped from 20 feet onto the shingle.

They cost more than standard shingles, so get both options priced in your quotes. Insurance discounts for impact-resistant roofs vary by company, so ask your agent whether yours offers one before you decide.

Concerned About Hail Damage?

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The Bottom Line

Hail damage is real, but it's also oversold by companies looking to make money off your insurance. Don't panic after every storm. Don't sign anything the day someone knocks on your door.

If you're genuinely concerned, call a local roofer you trust. Get an honest assessment. Then decide what makes sense based on facts, not fear.