Grit in the gutters, dark patches on the shingles, a pile of sand at the bottom of a downspout. Sooner or later every asphalt roof sheds granules. So is shingle granule loss normal wear, or a sign of damage? The answer depends on how much, where, and what happened just before you noticed it.
This guide explains what granules do, the difference between gradual wear and event damage such as hail, how to judge what you are seeing from the ground, and when it is worth a professional look. Every check here is done from the ground, a window or the attic hatch.
What are shingle granules, and why do they matter?
Granules are the coloured, sand-like coating on top of an asphalt shingle. They are crushed rock with a ceramic coating, and they shield the asphalt underneath from sunlight. When granules wear away, the asphalt is exposed to ultraviolet light, which is what ages a shingle. Granules are protection, not decoration.
The Asphalt Roofing Manufacturers Association (ARMA) describes granules in its guide to the asphalt shingle roofing system as ceramic-coated, crushed rock particles that coat the face of the shingle. ARMA says they provide the shingle’s colour and protect the asphalt from degradation that would occur from prolonged exposure to UV light.
That is why granule loss gets attention. A shingle with its granules intact keeps sunlight off the asphalt. A shingle with a bald spot does not. In North Texas, where summer sun is strong and long, exposed asphalt is under constant stress.
It also explains why granules turn up in gutters at all. They sit on the surface, and rain, wind and time move some of them downhill. A little is expected. The pattern and amount tell the story.
Is shingle granule loss normal?
Some granule loss is normal on every asphalt roof as it ages. Gradual, even shedding across the whole roof over years is wear. Concentrated loss in spots, bare patches with sharp edges, or a sudden heavy load of granules after a storm is different, and is worth having inspected because it can indicate damage.
The roofing trade bodies frame it the same way. ARMA’s homeowner FAQ tells homeowners checking whether they need a new roof to look for “excessive loss of the protective mineral granules”, along with cracked, curled or missing shingles. The National Roofing Contractors Association (NRCA) lists excessive surface granules accumulating in the gutters or downspouts among the visible signs of roof problems that inspections can uncover.
The key word in both is “excessive”. Neither body publishes a number, such as a cupful per gutter, that separates normal from too much. Be wary of anyone who quotes one as a rule. Judgement comes from the pattern on the roof, not the volume in the gutter alone.
| Usually normal wear | Worth an inspection | |
|---|---|---|
| Where | Spread evenly across all slopes | Concentrated on one slope, in spots or lines |
| When | Gradual, over years | Suddenly, after a storm |
| Shingle surface | Evenly thinner colour | Dark spots, bare patches, exposed mat |
| Gutters | Light grit after heavy rain | Heavy deposits after a single event |
| Other signs | None | Dents in metal vents or gutters, cracked or torn shingles |
What causes granule loss on a roof?
Granule loss has a handful of causes: normal weathering over time, hail impacts, foot traffic and rough cleaning, water flow concentrated by downspouts or valleys, and occasionally a product or installation problem. Each leaves a different pattern, which is why location and timing matter more than the granules themselves.
Weathering. Sun, heat and rain slowly loosen granules across the whole roof. The loss is even, and the colour fades evenly.
Hail. Hailstones knock granules off where they strike. The Insurance Institute for Business & Home Safety (IBHS) tests shingles by replicating realistic hail impacts and, in its hail impact-resistant shingle ratings, assesses damage ranging from granule loss and dents to surface cracks and a fully compromised shingle. Granule loss is one of the recognised ways hail damages a shingle.
Foot traffic and cleaning. People walking on the roof, satellite or solar installers, and aggressive sweeping or pressure washing can scrub granules off. Our guide to roof maintenance mistakes such as pressure washing and sweeping explains which habits cause it.
Concentrated water. A downspout from an upper roof that empties onto a lower slope can wear a path through the granules.
Product or installation issues. If a newer roof sheds heavily, document it and ask the installer and the shingle manufacturer whether that is expected for the product. The manufacturer’s warranty terms decide what they cover.
How does hail-related granule loss differ from wear?
Hail leaves impact marks, not even wear. Look for random dark spots where granules were knocked away, often with a bruise or dent, together with dents in metal vents, gutters and downspouts. Wear is uniform and gradual. Hail damage has a date and usually appears on the slopes facing the storm.
Hail is a regular event here. According to NOAA’s Storm Events Database, the Plano area logged 310 hail reports on 62 separate days between 2016 and 2025. Hail of 2 inches or larger was reported on 17 of those days. Those counts come from the raw Storm Events data files and describe reports, not every storm.
IBHS also looked at a single major event here. Its analysis of the 24 May 2011 hailstorms evaluated claim and policy data for more than 67,000 homes in 20 ZIP codes across Dallas-Fort Worth, studying how roof material and roof age affected hail damage.
Granule loss from hail can matter for water resistance too. An IBHS study of water leakage in hail-damaged shingles investigated how hail damage affects water permeability, and stressed choosing impact-resistant products with an excellent tear rating.
For a fuller side-by-side, read how to tell hail damage from blistering and normal wear. Blisters that pop can also leave small bare spots, which is one reason a trained eye helps.
What can you check safely from the ground?
You can learn a lot without a ladder. Scan the roof with binoculars, look at gutters and downspout outlets after rain, check metal parts for dents, and look in the attic for stains. Do not climb onto the roof. Walking on shingles is a fall risk and itself knocks granules loose.
ARMA’s homeowner advice is direct on this: inspect from the ground with binoculars, do not climb on the roof because it is dangerous and can damage the roof, and use a flashlight in the attic to look for stains or wet spots on the underside of the deck.
A safe check, in order:
- Binoculars from the yard. Walk around the house. Look for dark patches, bare spots, lines of missing granules, and cracked, curled or missing shingles. Compare slopes.
- Gutter and downspout outlets. From the ground, look at the splash area below each downspout. Heavy granule deposits after one storm are a clue. Do not climb to scoop gutters.
- Metal parts. Dents in gutters, downspouts, vent caps and window screens after a storm suggest hail big enough to mark the roof.
- The attic. From the hatch, with a flashlight, look for stains or damp areas on the decking.
- Inside rooms. NRCA says to watch for cracked paint, discoloured plasterboard and peeling wallpaper as signs of damaged roof areas.
- Photograph everything with dates. Photos made right after a storm are worth far more than photos taken months later.
When does granule loss mean you need repair or replacement?
Granule loss alone rarely decides it. What decides it is whether the shingle underneath is damaged or worn out: exposed mat, cracks, tears, brittle or curling tabs, or leaks. Spot damage can often be repaired. Widespread loss with ageing shingles usually points toward planning a replacement. An inspection separates the two.
NRCA’s homeowner guidance says biannual inspections often uncover problems such as cracked, warped or missing shingles, loose seams, deteriorated flashings and excessive surface granules in gutters. It also says a leaking roof does not necessarily need complete replacement, since leaks can come from loose flashing or one damaged section.
A practical way to think about it:
| What you see | Likely meaning | Next step |
|---|---|---|
| Light, even grit; uniform colour | Normal ageing | Keep watching; note it at each season |
| Heavy grit after a storm, dented metal | Possible hail damage | Inspection; document the storm date |
| Bare spots with exposed mat on several slopes | Shingles losing protection | Inspection; discuss repair or replacement |
| Bald areas plus leaks or stains | Active failure | Prompt inspection and repair |
If hail is involved and you plan to file a claim, the policy and the insurer decide what is covered. Confirm the terms and any filing deadlines with your insurer before work starts.
What should an inspection report on granule loss tell you?
A useful report separates wear from damage and shows the evidence. It should say where granule loss appears, whether the mat is exposed, whether there are dents, cracks or tears, and which findings it links to a storm. Photos of each slope, with the location of each finding marked, let you check the conclusions yourself.
Ask for these points in writing:
- Location and extent. Which slopes, and roughly how much of each, show loss.
- Cause. Whether the inspector attributes the loss to ageing, to hail on a named date, to foot traffic or to water flow.
- Shingle condition. Exposed mat, cracks, tears, brittleness and sealing of the tabs.
- Related parts. Flashing, vents, valleys and gutters, since NRCA lists deteriorated flashings alongside granule loss as signs found in inspections.
- Recommendation. Monitor, repair or replace, with the reason stated.
A report that says only “granule loss, needs a new roof” without photos or a cause is not enough to act on. Ask for the detail, or get a second opinion.
Do some shingles hold their granules better than others?
Yes. Shingles differ in how well they resist hail, including how much granule loss they suffer when hit. Independent testing shows that even products sold as impact-resistant do not all perform the same. If you are replacing a roof in a hail-prone area, check independent test results rather than marketing labels.
IBHS says in its shingle ratings that not all “impact-resistant” asphalt shingles perform the same. It buys products from retail stores and rates them, and homeowners can view detailed performance for dents, tears and granule loss by product.
This matters when you get quotes. Ask the contractor which product they propose, then look it up in the IBHS ratings. A quote that names the exact product line is easier to check than one that just says “architectural shingles”.
If you are not sure what you are looking at on your own roof, a professional roof inspection from Roofing Repair Plano can tell wear from damage and photograph each finding. For the full picture of damage types and decisions, see our complete guide to roof damage in Plano.
Frequently asked questions
How much granule loss on shingles is normal?
Some loss is normal on every asphalt roof as it ages, and light grit in gutters after heavy rain is common. Neither ARMA nor NRCA publishes a fixed amount that is acceptable. What matters is the pattern: even, gradual loss is wear, while concentrated bare spots or heavy loss after a storm deserve an inspection.
Is it bad to find granules in my gutters?
Not necessarily. A little grit is expected as shingles age. NRCA lists excessive granules accumulating in gutters or downspouts as a sign of possible roof problems, so heavy deposits, especially right after a storm, are worth a closer look. Check from the ground and compare with earlier seasons.
Why is my new roof losing granules?
Some loose granules can appear after installation, but heavy or patchy loss on a new roof should be documented. Photograph it with dates and ask the installer and the shingle manufacturer whether it is expected for that product. The manufacturer’s warranty terms decide what is covered, so keep your paperwork.
Can hail cause granule loss?
Yes. IBHS tests shingles by replicating realistic hail impacts and rates damage from granule loss and dents up to a fully compromised shingle. Hail tends to leave random dark spots, often with dented metal vents and gutters nearby. An inspector can tell impact marks from even wear.
Can I check my roof for granule loss myself?
You can check from the ground. ARMA advises using binoculars and not climbing on the roof, which is dangerous and can damage the shingles. Look for bare spots and uneven colour, check downspout outlets and metal parts for dents, and look in the attic with a flashlight for stains.
