Shingle granule loss is the shedding of the ceramic-coated mineral granules that cover an asphalt shingle and shield the asphalt from sunlight. Some loss is normal: new shingles shed loose surplus granules for the first few years, and every roof thins slowly with age. It becomes a problem when the granules are gone down to bare asphalt, whether from age, hail, scuffing or blisters. The pattern of the loss tells you which. This page is general information; your roofer and insurance company decide what applies to your roof.
On this page: Signs · Causes · Reading the pattern · What to do · Basis · When to call
Signs of granule loss
- Sandy granules piled in gutters or at downspout outlets.
- Dark, shiny or smooth patches on shingles where the asphalt shows.
- Shingles that look uneven in color across a slope.
- On older roofs, exposed fiberglass mat at the worst spots.
The five common causes
| Cause | What it looks like | Is it a problem? |
|---|---|---|
| New-roof shedding | Granules in gutters during the first few years; shingles look uniform | No. Normal. |
| Age and weathering | Even thinning across sunny slopes; edges wear first | Yes, once asphalt shows across slopes |
| Hail | Random dark spots or bruises; dents on soft metals nearby | Yes, can be functional damage |
| Foot traffic and scuffing | Loss along walking paths or near equipment | Usually a repair |
| Blisters | Small pockmarks where bubbles popped | Depends on how widespread (see blistering) |
Reading the pattern from the ground
Stay on the ground and use binoculars, ideally in morning or evening light.
- How old is the roof? Granules in the gutter of a roof under a few years old are expected.
- Is the loss even or spotty? Even thinning on the sunniest slopes points to age. Random spots point to impact or traffic.
- Check soft metals. IBHS suggests looking for dents or spatter marks on gutters, downspouts, metal flashing, air conditioners and patio furniture. Those confirm hail fell, which helps separate hail from wear.
- Look for paths. Loss that follows a line from a ladder spot to a satellite dish or vent is foot traffic.
What to do about it
| Situation | Typical next step |
|---|---|
| New roof shedding loose granules | Nothing; keep gutters clear. |
| A few bare spots from impact or scuffing | Replace the affected shingles. |
| Hail spots across slopes | Have the roof inspected and documented; talk to your insurer about the policy. Our hail damage assessment tips explain what roofers look for. |
| Bare asphalt across slopes from age | Plan a replacement. |
What not to do: coat or “rejuvenate” the roof to fix granule loss, call normal new-roof shedding a defect, or call age-related wear hail damage. Calling wear hail on a claim is a fast way to lose credibility with an adjuster.
Manufacturer and research basis
IKO’s Residential Information Bulletin R-2 (1992, revised 2012) says surplus “hitchhiker” granules come off during the first few years, that losing them is completely normal and does not reduce the shingles’ weatherproofing life, and that granule loss matters only when bare spots of coating asphalt are exposed. IBHS’s guide to telling hail from look-alikes lists edge granule loss from weathering and granules washed off by heavy rain as not hail, and names random impact marks, bruises, cracks and damaged ridge caps as hail signs. InterNACHI’s inspection material describes scuffing as granule loss along foot-traffic paths.
When to call a roofer
Call when you see bare patches, when granules keep coming on a roof past its early years, or after a hailstorm with dented gutters. In Colorado, where strong sun at altitude and frequent hail both wear shingles, granule condition is one of the first things we check. Related guides: nail pops, blistering and the full roof problems guide. If you are weighing a new roof, see how long a roof should last.
Get an honest granule check
Integrity Roofing and Painting is veteran-owned and family-run since 1990, an Owens Corning Platinum Preferred contractor with 650+ Google reviews. We will tell you plainly whether the loss is normal, wear or storm damage, with photos. Call (719) 488-2800 in the Colorado Springs area or book a free inspection; (303) 209-0152 in the Denver metro or a free Denver inspection; (512) 610-5897 in Austin or a free Austin inspection. We reply the same business day.
Sources: IKO Residential Information Bulletin R-2, Excess roofing granules on shingles; IBHS, Is it hail damage?; InterNACHI, Mastering Roof Inspections: Asphalt Composition Shingles, Part 37.
