Hail damage to vinyl siding shows up as cracks, punctures and broken-out chunks, most often along the bottom lip (the lap) of each panel, and concentrated on the walls that faced the storm. Thin and foam-backed profiles break at smaller hail sizes than heavier ones. The fix is to replace damaged panels, not to caulk them. This page is general information about how the damage looks and how it is repaired; your policy and your adjuster decide what a claim covers.
On this page: Signs · Why vinyl breaks · Ground check · Repairs · Research · When to call
Signs of hail damage on vinyl
- Hairline or open cracks running up from the bottom edge of a panel.
- Round or star-shaped holes, sometimes with a chunk missing.
- Damage heavy on one or two walls and light or absent on the others.
- Chipped or split corner posts, J-channel and vinyl window trim on the same sides.
- Matching evidence nearby: dented gutters and downspouts, torn window screens, spatter marks on the driveway or fence.
Why vinyl breaks in hail
- The lap is the weak point. The bottom lip of each panel hangs slightly off the wall, so it flexes and snaps when struck.
- Small hail is enough. In lab tests, common vinyl profiles cracked at ice balls about 1 inch across, so a storm that leaves the roof looking fine can still break siding.
- Thin or foam-backed profiles. Thinner panels broke at smaller ice sizes in testing.
- Wind-driven hail hits walls more squarely, which is why the storm-facing side takes most of the damage.
A walk-around check after the storm
- Wait until it is safe and the hail has melted. Walk each side of the house in daylight.
- Look along the bottom edge of the panels at eye level and up the wall. A low sun angle across the wall makes cracks easier to see.
- Photograph each crack with something for scale, then take a wide shot of the whole wall so the location is clear.
- Note which walls are hit and which are not, and photograph dents on gutters, downspouts and the air conditioner fins on the same sides.
- Stay off ladders. Upper walls can be photographed from the ground with a zoom lens.
Our hail damage checklist for Colorado homeowners covers the first 24 hours and what to document for a claim.
Repairs, and the wrong fixes
| Repair | When it fits |
|---|---|
| Unlock and replace individual panels with a siding zip tool | A few broken panels and matching stock is available. |
| Replace the siding on the damaged walls | Damage is widespread on one or two elevations. |
| Re-side the house | Panels cannot be matched, or damage is on most walls. |
| Check and repair the weather barrier behind broken panels | Holes let water reach the wall; inspect before covering. |
Wrong fixes: caulk or tape over cracks, painting cracked vinyl, or face-nailing loose panels tight to the wall. Vinyl must hang loosely on its nails so it can move; nailing it tight causes buckling and more cracking.
What the research says
- Hail thresholds. Haag Engineering fired freezer ice balls at eight common siding profiles. Standard 0.042 and 0.046 inch vinyl cracked at about 1 inch, a 0.044 inch foam-backed lap at 3/4 inch and a 0.046 inch Dutch lap at 1-1/4 inch. The lap was the most vulnerable spot, and above 1-1/2 inches vinyl broke apart. The authors note lab ice is denser than natural hail.
- Independent testing is still thin. IBHS ran a full-scale hailstorm on a test house with vinyl and fiber cement siding in 2013, but its public summary reports no siding results.
- Code. The 2021 IRC, section R703.1.1, requires the wall to have a water-resistive barrier behind the cladding and a way to drain water that gets past it. Broken siding exposes that barrier to sun and direct rain.
If your house also has fiber cement or wood siding, see hail damage on fiber cement and wood siding, which is harder to spot.
When to call
Call after any storm that left marks on your gutters, cars or fence, even if the roof looks fine from the street. Vinyl siding can be hit by hail too small to damage shingles. Integrity installs siding and roofing, so one inspection covers both and documents them together. Our exterior problems guide lists the other wall, gutter and paint issues we see after storms.
Book a siding and roof inspection
Integrity Roofing and Painting is veteran-owned and family-run since 1990, an Owens Corning Platinum Preferred contractor with 650+ Google reviews. We photograph every damaged wall and give you a written scope you can share with your insurer. Colorado Springs area: call (719) 488-2800 or book a free inspection. Denver metro: call (303) 209-0152 or book a free Denver inspection. Austin: call (512) 610-5897 or book a free Austin inspection. We reply the same business day.
Sources: Herzog, Morrison, Patnode and Green (Haag Engineering), Ice Ball Impact Testing of Siding, 2012 (IIBEC); IBHS, Building Vulnerability to Hailstorms; 2021 IRC Chapter 7, section R703.1.1 (UpCodes).
