Granules in the Gutter After Hail: What They Mean

Every asphalt shingle is surfaced with ceramic-coated mineral granules pressed into hot asphalt at the plant. They give the shingle its color, but their real job is shading the asphalt from sunlight, which is what breaks asphalt down over the years. A shingle carries more granules than it can hold onto forever, so some come loose under ordinary weather. Rain carries them to the eaves. Your gutter is basically a collection tray for everything the roof gives up, which makes it a decent place to start reading what happened overhead. Just don't read too much into it.

On a roof less than a year old, loose granules are expected. Shingles ship with surplus that never bonded, and the crew walking the roof during installation knocks more free. That tapers off after a few seasons. On a roof fifteen or twenty years in, shedding is simply age: the asphalt has dried out, the bond has weakened, and the bottom of every downspout shows a gray-black fan after a hard rain whether hail fell or not. The third reason is impact. A hailstone strikes the shingle and blasts the granules off in one shot. That's why a hail deposit tends to land all at once, and heavier than anything you've scooped out before.

Check the splash block or the patch of lawn under every downspout the morning after the storm. Hail on a roof that was shedding very little can leave a visible pile, sometimes with flecks of black asphalt mixed in. Compare one downspout against another. The ones draining the slopes that faced the storm usually carry more, because those slopes took more strikes. If every downspout shows the same light dusting you've always seen, that leans toward age. If the north drains are clean and the west drains are buried, the storm came out of the west and it hit hard enough to matter.

Granules in a gutter are a clue about the shingles, so the next step is the shingles themselves, and a fair amount can be done from the yard. Binoculars on a sunny afternoon will show whether the surface has dark, round spots scattered with no pattern. That's how impact reads. Age wears a slope more evenly and worst along the paths water runs. Then walk the house and look at the metal. A gutter face with small dents, a dinged downspout elbow or a dimpled furnace vent cap tells you hail of some size came through. Our page on what hail damage looks like has more of the visual cues.

We've watched it happen. A door-knocker scoops a handful of grit out of a downspout, holds it up to the homeowner and says the roof is finished. Granules alone don't make that case, and an adjuster won't accept them as proof. If your roof is twelve years old and has been shedding for five, the grit in your gutter is the roof getting older, and filing a claim on it invites a denial that stays on your claims history. We'll tell you that straight, even when it means there's no job in it for us. The storm chaser warning page lays out the other tactics worth watching for.

Once a roofer has confirmed impacts on the shingles, the granules matter again, this time as part of the record. Photograph the deposit where it landed before you clean anything out, with a coin or a tape in the frame and the date stamp on. Shoot the inside of the gutter runs and the dented faces too. None of that wins a claim by itself. It backs up the test-square counts and soft-metal photos that do, and it helps tie the loss to a specific storm date, which matters when the carrier asks why you're filing when you are. Policies set notice windows, and our page on the hail claim deadline explains how they work.

A roof that took real hail and was never repaired keeps shedding faster than it should. The impact craters have no granule cover left, so sunlight goes straight to work on the exposed asphalt, and each freeze and thaw widens whatever crack the stone started in the mat. Expect heavier grit every spring. A bruised shingle usually keeps water out for two to five years before the fracture opens through. That's why the deposit in your downspout is often the first warning anybody gets, and why the storm behind a ceiling stain may be several seasons gone by the time the stain appears.

Call after any storm that left hail on the ground, any time the gutters suddenly collect far more than usual, or if you're buying a house and the downspouts are packed with grit. The inspection is free. We get on the roof, chalk a test square on each slope, count the strikes, press each one to check the mat and photograph the soft metals. Then you get the pictures whether you hire us or not. John Beal Roofing is a family company, third generation, and the storm line at 1-800-564-6232 is answered by a live person at any hour.