How do I know if my roof has hail damage?
From the ground, you mostly cannot. The reliable ground-level signs are dents in the gutters, the downspouts, the vents and the flashing, and a build-up of granules where the downspout discharges. Hail damage on the shingles themselves is a scatter of soft, dark bruises where the granules have been knocked off and the mat underneath has fractured, and it takes somebody on the roof to find it.
The soft metal tells you first
Aluminum and galvanised steel dent at a hail size well below the size that fractures a shingle. That makes the gutters, the downspouts, the turbine and box vents, the flashing and any metal patio cover the first place to look, and all of them are visible from the ground.
Look along a gutter face with the light raking across it rather than straight on. Dents that are invisible from directly in front show up clearly at an angle. On vents, look at the top surface: hail falls at an angle in wind, so the strikes concentrate on whichever side faced the storm.
What a hail bruise looks like on a shingle
A hail hit on an asphalt shingle leaves a round mark, roughly the diameter of the stone, where the granules have been driven off. The exposed asphalt underneath is darker than the surrounding surface, and pressing on it feels soft, like a bruise on fruit, because the fiberglass mat beneath has cracked.
What it is not is a hole. This is the whole reason hail damage goes unclaimed: the roof does not leak. The fractured mat lets ultraviolet light at the asphalt, the asphalt dries out and shrinks around the crack, and two or three summers later the shingle splits and water comes in. By then the storm is years old and the claim window has usually closed.
Damage that is confined to one slope is normal and expected. Hail arrives on the wind, so the north and west elevations take it in most North Texas storms while the sheltered side looks untouched.
Things that look like hail and are not
Blistering is the common false positive. Trapped moisture in the asphalt pops the surface as the roof heats, leaving small round craters with no granules, and it looks close enough to hail to fool a homeowner. The difference is the mat: a blister has not fractured anything underneath it, and the edges are raised rather than dished.
Mechanical damage is the other. Scuffs from somebody walking a hot roof, marks where a satellite dish was mounted, and granule loss in the drip line under a tree branch all mimic the appearance without the cause.
Do not get on the roof to check
Walking a roof to look for hail damage is how people get hurt and how shingles get scuffed into looking like hail damage. It is also unnecessary: the inspection is free, and a roofer who does this weekly will read a slope in a few minutes.
What is worth doing is writing down the date of the storm. A claim is tied to a dated weather event, and remembering which night it was makes the rest of it straightforward.
Related questions
How big does hail have to be to damage a roof?
Roughly one inch and up damages most asphalt shingle roofs, and smaller stones can do it on an older or a lower-grade shingle. Soft metal dents well below that.
Can I see hail damage from the ground?
You can see the corroborating signs: dented gutters, dented vents and flashing, granules at the downspout. The shingle damage itself needs somebody on the roof.
How long does hail damage take to cause a leak?
Usually two to five years. The fractured mat has to weather and split before water gets through, which is exactly why the damage goes unnoticed until the claim is stale.
