Hail Size vs. Roof Damage: What Actually… | Wannamaker

Every spring and early summer, San Antonio's weather apps light up with hail warnings. You hear "quarter-sized" or "golf-ball-sized" and try to figure out whether that means a new roof or just a few dings on the truck. The truth is, hail size alone doesn't tell the whole story — but it's the single biggest factor in whether your roof walks away unscathed or needs serious attention. Here's what each size actually does, based on what we see when we climb up after the storm passes.

The Hail Size Chart That Actually Matters

Weather reports love comparing hail to food and coins. That's fine for radio, but it doesn't tell you what's happening to your asphalt shingles, tile roofing, or metal roofing. Here's the real-world breakdown:

Pea to Marble Size (¼" to ½")

This is the hail that makes a lot of noise and usually does very little. On a standard 3-tab or architectural shingle, hail this small rarely causes functional damage. You might see some granule displacement if the shingles are already aged (15+ years), but adjusters generally won't write a claim for this size. Gutters might get minor cosmetic dings. Your car is fine. Your roof is fine.

Bottom line: No action needed unless your roof was already in rough shape.

Dime to Nickel Size (¾" to ⅞")

Now we're entering the gray zone. Dime-sized hail driven by strong wind — which is common in San Antonio storms rolling off the Hill Country — can bruise shingles. "Bruising" means the granule layer gets knocked loose and the underlying mat takes an impact. You can't always see it from the ground. On older roofs (10+ years), this size starts producing legitimate damage. On newer impact-resistant shingles (Class 4), it usually bounces off without consequence.

Bottom line: Worth a free roof inspection if your roof is more than a decade old or you noticed granules washing out of your downspouts.

Quarter Size (1")

This is the threshold where insurance carriers start paying close attention — and you should too. Quarter-sized hail consistently damages standard architectural shingles. We're talking visible impact marks, cracked granule surfaces, and compromised mat integrity. At this size, wind speed becomes a multiplier. A quarter-sized stone at 60 mph hits dramatically harder than one falling in calm air.

On tile roofs — common in neighborhoods like Stone Oak, Alamo Heights, and parts of Boerne — quarter-sized hail can crack thinner concrete tiles and chip clay tiles. Hairline cracks are the hidden danger here because they let water in slowly.

Bottom line: Get an inspection. If your adjuster confirms hits, you're likely looking at a valid insurance claim.

Golf Ball Size (1.75")

Golf-ball hail is where cosmetic damage ends and structural concern begins. At this size, shingles get fractured — not just bruised. The fiberglass mat beneath the granules cracks, meaning that shingle is functionally dead even if it's still stuck to the roof. Soft metals like aluminum fascia, gutters, and flashing get visibly dented. Skylights crack. Vent boots split.

Standing seam metal roofs handle this size better than most materials, though you'll likely see cosmetic denting. The panels still perform — the dents just bother people. Flat roofing membranes, like TPO and modified bitumen common on commercial roofing projects, can puncture at this size if the membrane is aged.

Bottom line: Almost certainly warrants a full hail damage repair or replacement claim. Document everything.

Tennis Ball and Larger (2.5"+)

At this point, we're past roofing damage and into "check your entire house" territory. Hail this large can punch through decking, shatter tile, crack rafters on older structures, destroy HVAC condensers, and break windows. San Antonio sees this size less frequently than cities farther north in Hail Alley, but it has happened — and when it does, entire neighborhoods need new roofs.

Bottom line: Full roof replacement is almost guaranteed. File your claim immediately.

Why Hail Size Isn't the Only Variable

Two storms can drop identical-sized hail and cause wildly different damage. Here's what else matters:

• Wind speed. Hail driven sideways by 50-60 mph gusts hits harder and impacts vertical surfaces like fascia and siding that normally get spared. Recent high wind warnings across parts of the Guadalupe Mountains remind us that West Texas systems can push severe wind into our region.
• Roof age and material. A 5-year-old Class 4 impact-resistant shingle laughs off quarter-sized hail. A 20-year-old 3-tab folds under dime-sized stones. Material matters enormously.
• Roof pitch. Steeper roofs deflect more energy. Low-slope and flat roofing systems take hits at closer to 90 degrees, which concentrates impact force.
• Hail density. Not all hailstones are solid ice. Some are slushy and soft, others are dense and hard. Dense stones at the same size do significantly more damage.
• Duration. A 30-second burst of quarter-sized hail is different from 10 minutes of sustained bombardment. Repeated impacts weaken materials progressively.

What to Do Right After a Hailstorm

If your area of San Antonio, Schertz, New Braunfels, or anywhere in the I-35 corridor gets hit, here's the order of operations:

• Document the hail. Photograph hailstones next to a coin or ruler before they melt. Timestamp matters for your claim.
• Check for immediate leaks. Look in your attic if accessible. Water stains on ceilings mean you need emergency storm damage tarping.
• Don't climb on the roof yourself. Wet, hail-battered shingles are slick and potentially cracked. Let someone with fall protection handle it.
• Call a local roofer before calling your insurance. A qualified inspection gives you documentation and leverage. Storm chasers from out of state will be knocking on your door within 24 hours — don't sign anything with someone who won't be here next year.
• File your claim within the policy window. Most Texas homeowner policies require notice within one year, but sooner is always better. Carriers like USAA, State Farm, and Allstate all have slightly different processes.

The Honest Take on "Cosmetic" vs. "Functional" Damage

Some insurance policies now include cosmetic damage exclusions — meaning if the dents don't affect performance, they won't pay. This mostly impacts metal roof claims and gutters. If your policy has this exclusion, you need to know before the storm hits, not after. Check your declarations page or ask your agent.

For shingles, the distinction between cosmetic and functional is less clear-cut. A bruised shingle with displaced granules is losing UV protection and will age faster. Whether that's "functional" depends on your adjuster — and having a knowledgeable roofer present during the inspection makes a real difference in how the damage gets classified.