How Big Does Hail Need to Be to Damage a Roof?
Last updated October 31, 2026
The short answer
Hail Size and Roof Damage
Hail starts to threaten most roofs at about 1 inch across, roughly the size of a quarter. At that size, impact can knock granules off asphalt shingles, loosen flashing, or dent soft metal. The damage may not leak right away, but it weakens the roof surface.
Once hail reaches 1.5 inches, the size of a golf ball, the risk jumps. That size can crack fiberglass shingles, split wood shakes, or puncture single-ply membranes. The roof's age and condition matter a lot. A newer, well-maintained roof resists hail better than one that is already brittle.
Roof Materials React Differently
Asphalt shingles are the most common roofing material and the most vulnerable. Hail impact can bruise or crack them, and the damage often goes unnoticed until rain finds a weak spot. Metal roofs, like steel or aluminum, dent more easily than they crack, but dents can lead to corrosion over time.
Tile and slate roofs handle small hail well but can crack or chip with larger stones. Flat roofs with a rubber or membrane surface can be punctured by hail at any size if the stone is sharp or driven by wind. The roof's slope also matters; a steeper roof takes hail at a sharper angle, which can increase impact force.
- Quarter size (1 inch): possible granule loss and minor dents
- Golf ball size (1.5 inches): cracked shingles and punctured membranes
- Baseball size (2.75 inches): serious structural damage
- Soft or old roofing fails at smaller sizes
- New, impact-resistant materials may survive larger hail
- Check valleys and edges where hail can collect
Signs of Hail Damage
After a hailstorm, look for missing granules in the gutters or downspouts, which means the shingle surface is wearing away. Check for cracks, dents, or chips in the roofing material itself. Inside the attic, look for water stains, light coming through, or damp insulation.
Some damage is not visible from the ground. A water damage inspection can catch hidden issues, like a punctured membrane or a loose flashing seam. If you suspect hail damage, act quickly. Water can travel along roof decking and soak into walls before you notice a leak inside.
What to Do After Hail Hits
First, document the damage with photos and notes. That helps your insurance company understand what happened. Then, if you see a leak or a hole, limit the water intrusion by placing a bucket or tarp over the area from inside, but only if it is safe to reach.
For a quick temporary fix, emergency roof tarping can keep water out until a full repair is possible. The pros can assess the roof and make a plan. Do not walk on a damaged roof yourself; it may be unstable, especially if hail cracked the decking. A local water damage pro can handle the cleanup and repairs safely.
Preventing Future Hail Damage
A roof in good condition is the right defense against hail. Replace worn shingles, seal flashing, and clear debris before storm season. Some roofing materials handle impacts better than others, so when reroofing, ask about hail-resistant options.
Keep an eye on the weather and have a plan for covering a roof with a tarp quickly after a storm. Regular roof inspections can catch weak spots before hail finds them. The pros can point out areas that need attention, but the maintenance is up to you.
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Call Now (480) 898-4279Frequently asked questions
Can small hail cause any damage?
Yes, hail smaller than 1 inch can still damage a roof, especially if it is pea-sized but falls hard or is blown by wind. It can knock granules off shingles or dent soft metal. The damage may be minor but can add up over time.
How can I tell if my roof has hail damage?
Look for missing granules in gutters, cracked or dented shingles, and water stains in the attic. Some damage is hidden, so a professional inspection can find issues like punctured membranes or loose flashing. Check after any hailstorm, even if you see no obvious signs.
Should I file an insurance claim for hail damage?
Check your policy to see if hail damage is covered. Policies vary, and your insurer decides what is covered. Document the damage with photos and notes before contacting your insurance company. They will tell you what steps to take next.