Hail Damage to Skylights: Cracks, Seals and Leak Risk

Most of a roof sheds hail across a sloped, uniform surface. A skylight does not get that luxury. It sits proud of the roof plane with glass, metal cladding, and a sealed perimeter all exposed to the same impact, and each of those three parts fails in its own way. That is exactly why skylights are one of the first things a careful post-storm inspection checks, and one of the last things a homeowner thinks to look at from the ground. This guide walks the three failure points in the order a real inspection checks them, so you know what a survived skylight actually looks like versus one that only appears to have survived.

01 / THE SHORT ANSWERWhat hail actually does to a skylight

Hail can damage a skylight in three separate ways, and a given storm rarely does just one. It can crack or craze the glass itself. It can dent the aluminum cladding and flashing that frame the unit, the same way it dents any soft metal on a roof. And it can compromise the rubber gasket or sealant that keeps water out around the frame, without leaving any mark you would notice by looking. The third failure is the one that catches homeowners off guard, because a skylight can take a real hit, look completely intact for weeks, and then start leaking the first time wind drives rain against it at the wrong angle.

02 / THE GLASSCracked and crazed glass: the damage you can see

Glass is the most visible part of a skylight and the easiest damage to confirm, which is also why it gets the most attention and the least benefit of the doubt. A direct hail strike can put a clean crack through a pane, or it can leave a spider web of finer fractures called crazing, where the impact stressed the glass without punching all the way through. Most residential skylights use tempered glass for the exterior pane, which is built to resist impact and, when it finally does fail, to break into small granular pieces rather than long shards. That is a safety feature, not proof the glass is undamaged; a tempered pane can carry a crack line for a long time before it lets go all at once, often on a day with no storm at all.

Some skylights use laminated glass, a sandwich construction with a plastic interlayer that holds cracked glass together even after it fractures. A laminated pane can look like nothing happened while the glass underneath is genuinely broken, which is one more reason a crack you can see is only ever a starting point, not the whole story. Either way, the rule for glass is simple: a crack, a crazed pattern, or a chip near an edge or corner is never something to wait out. Edges and corners carry more stress than the center of the pane, so damage there is more likely to spread with the next temperature swing or the next gust.

03 / THE CLADDINGDented cladding: hail's witness mark

Around most residential skylights, the visible frame is aluminum cladding, and aluminum dents at hail sizes that may not have hurt the glass at all. That makes the cladding a useful witness even when the glass looks perfect. Our guide to hail dents on soft metals covers the same idea across vents, valley metal, and gutters: dent density and diameter on a soft metal surface give a rough read on how big the hail was and which direction it came from, information that helps an inspector know what to expect on the harder surfaces nearby.

COMPONENT	WHAT HAIL DOES TO IT	WHY IT MATTERS
Glass or acrylic pane	Cracks, crazing, chipped edges	Structural failure risk, sometimes delayed
Aluminum cladding and frame	Dents, dimples, bent corners	Reliable witness mark for hail size
Perimeter gasket or sealant	Compression, tearing, bond failure	No visible sign, but where leaks start
Curb flashing	Lifted, torn, or dented at the base	Redirects water into the roof deck instead of off it

A dented curb or a bent corner on the cladding is also worth a second look on its own, separate from what it tells you about hail size. Dents at the base of the unit, where the curb flashing steps up from the roof deck, can bend the metal enough to change the direction water sheds, aiming it toward a seam instead of away from one. That is a mechanical problem hail creates directly, not just a clue about hail elsewhere on the roof.

04 / THE SEALSeals, gaskets, and flashing: the leak that shows up later

This is the part of a skylight that decides whether a storm was cosmetic or costly, and it is also the part nobody can inspect from the ground or a photo. A skylight's watertight seal depends on a rubber gasket compressed evenly against the glass and frame, plus the sealant and flashing details around the curb. A hard enough impact can shift the frame slightly, compress the gasket unevenly, or crack a bead of sealant that looked fine the day it was installed. None of that shows up as a visible defect. What shows up is a leak, sometimes the next time it rains hard from a particular direction, sometimes not until the freeze-thaw cycle works the gap open further.

The tell is almost always inside the house, not outside on the roof. Watch for a faint ring of discoloration on the drywall around the skylight well, a musty smell that was not there before, or condensation trails running down the inside of the shaft rather than beading evenly across the glass. Our guide to ceiling stains after a storm covers how to read a fresh stain versus an old one and why the water rarely enters exactly where the stain appears; around a skylight, water can travel along the shaft framing for a surprising distance before it drops.

A skylight that survived the hail on the glass can still fail on the seal. The two are different failures with different timelines, and only one of them announces itself right away.

05 / NEXT STEPSWhat to do, and what to leave to a professional

• From the ground or a window, look at the skylight glass for cracks, crazing, or chipped corners with binoculars rather than a ladder.
• Check the cladding and curb for dents or bent corners; even minor dents are worth noting and photographing with something for scale.
• Inside the house, check the drywall and trim around the skylight well for new staining, a musty smell, or condensation that runs rather than beads.
• Do not climb onto the roof to press on the glass or the gasket; that is exactly the kind of pressure that can turn a stressed pane or a compromised seal into an active leak.
• Photograph anything you see, note the date, and let a professional inspection confirm what the glass, cladding, and seal actually need.

General roof repair work, including flashing and seal repair around a skylight, generally falls within our published repair range of $350 to $3,200, and larger or complex repairs can run higher; the glass or unit itself is priced separately once the specific model and damage are confirmed. The only way to know which category a given skylight falls into is a look at all three failure points together: glass, cladding, and seal. That is exactly what our storm damage inspection service covers, alongside the rest of the roof, and if the skylight only needs a seal repair rather than a full replacement, that is what we will tell you. You can also start a free inspection request directly from this page.