Why are my shingles losing granules?
Updated August 2026
Shingles shed granules mainly because the roof is aging toward the end of its 15 to 30 year life, and finding a pile of grit in the gutters is one of the clearest signs. A little shedding right after a new roof goes on is normal loose material, but bare black patches on the shingles and heavy grit in the downspouts mean the protective surface is wearing off and the roof needs inspection and a replacement budget. Hail and a superheated attic speed the same wear.
Safety first: granule loss exposes the asphalt mat to UV and, eventually, to water, so a roof shedding heavily is losing its weather protection and a leak follows. Checking the gutters and downspouts for grit is a safe ground-level job; walking the roof is not, especially on shingles already weakened by granule loss. Use binoculars from the ground or a ladder at the eave, and let a roofer walk it to judge whether it can be saved.
Causes, most likely first
| Cause | How likely | The fix | Typical cost |
|---|---|---|---|
| Normal aging (end of life) | Most common | Granules loosen as shingles near the end of a 15 to 30 year life; gutters full of grit and bare black spots mean the roof is aging out. | Reroof: $8,000–25,000 |
| Fresh-install shedding | Common | A new roof sheds loose factory granules for the first few weeks to months; this is normal and tapers off on its own. | Normal |
| Hail or storm damage | Common | Hail knocks granules off in bruised patches; document it with photos and a roofer's report and check your insurance promptly. | Insurance claim |
| Poor attic ventilation | Occasional | A superheated attic ages the shingle surface faster, speeding granule loss on a younger roof; add soffit and ridge venting. | $300–1,500 |
| Foot traffic or tree abrasion | Occasional | Walking the roof or branches rubbing it scrubs granules off in tracks; trim the branches back and stay off the roof. | Tree trimming |
Check these first
- Scoop a handful from the gutters or the downspout splash blocks; a heavy layer of sand-like grit points to real shingle wear.
- Look up the roof with binoculars for bare, dark patches where the colored granules are gone and the asphalt shows.
- Note the roof's age: shedding on a roof under a year old is usually harmless factory grit, while shedding on a 15-plus-year roof is end-of-life wear.
- Check whether the shedding followed a hailstorm, which can support an insurance claim if you document it promptly.
- Feel the attic on a hot day for excessive heat, a ventilation problem that speeds surface wear.
Prevent it next time
You cannot stop an old roof from shedding, but you can keep a younger one from aging early. Balanced attic ventilation keeps the shingle surface cooler so it holds its granules longer, and staying off the roof avoids scrubbing granules loose. Track shedding as part of your asphalt shingle roof maintenance checklist, and act on the first signs of water intrusion, because the cost of ignoring a small roof leak dwarfs a timely inspection.
When to call a pro
Have a roofer inspect when you see bare asphalt patches, when the gutters fill with grit season after season, or right after a hailstorm to document damage for insurance. An inspection runs $150 to $400, and if the roof is shedding heavily across a 15-to-30-year lifespan, a full replacement of $8,000 to $25,000 is on the horizon. Our guides on how often to replace an asphalt shingle roof and how long a shingle roof lasts help you time and budget it.
Most of the causes above are maintenance problems wearing a disguise. OnOtto keeps the boring prevention on schedule so the 2 a.m. version doesn't happen.
Stop chasing symptoms, free for 30 daysFrequently asked questions
Is it normal for a new roof to lose granules?
Yes. A newly installed asphalt roof sheds loose granules left over from manufacturing and handling, and you will see them in the gutters for the first few weeks to a few months. This is cosmetic and tapers off on its own. What is not normal is heavy, ongoing granule loss that exposes bare black asphalt, or grit that keeps filling the gutters a year or more after installation. If the shedding does not slow down, or you see bald patches, have it inspected.
How much granule loss is too much?
A light dusting of granules in the gutters, especially on a new or recently stormed roof, is normal. The warning signs are volume and bare spots: cups of sand-like grit collecting every season, and visible patches where the colored granules are gone and the black asphalt mat shows through. Those bald areas mean the shingle has lost its UV and weather protection and is failing. On an older roof, that combination signals the roof is aging out and it is time to plan a replacement.
Does granule loss mean I have a leak?
Not immediately, but it is the step before one. The granules are the shingle's sunscreen and armor; once they wear away, UV degrades the asphalt and the surface eventually cracks and lets water through. A roof shedding heavily has not necessarily leaked yet, but its protective layer is thinning. Catching it at the granule-loss stage lets you plan a replacement on your schedule instead of reacting to water stains on the ceiling after the shingles finally fail.
Can I file an insurance claim for granule loss?
Sometimes, if the loss came from a covered event like a hailstorm rather than ordinary aging. Insurers generally do not pay for normal wear, but hail that knocks granules off in bruised patches can be a valid claim if you document it quickly with photos and a professional inspection. Gradual, age-related shedding across an old roof is considered maintenance and is on you. If a recent storm triggered the shedding, call a roofer and your insurer promptly, since claim windows are limited.