Weather reports describe hail by size using familiar objects — quarter, golf ball, baseball, softball. But what do those sizes actually mean for your roof? At what size does damage start? And what's the difference between a "cosmetic" claim and a "functional" damage claim?
The Standard Hail Size Reference Chart
| Common Name | Diameter | Roof Impact | Action |
|---|---|---|---|
| Pea | 0.25" | None on healthy roof | No action needed |
| Marble / Mothball | 0.50" | Minimal granule displacement | Monitor |
| Dime / Penny | 0.75" | Measurable granule loss begins | Consider inspection |
| Quarter | 1.00" | Clear granule damage, bruising likely | Get inspection |
| Half Dollar | 1.25" | Significant granule loss, mat exposure | Inspection + likely claim |
| Ping Pong Ball | 1.50" | Deep bruising, cracking possible | Inspection + claim |
| Golf Ball | 1.75" | Severe granule loss, puncture risk | Urgent inspection |
| Tennis Ball | 2.50" | Punctures, splitting, major damage | Emergency inspection |
| Baseball | 2.75" | Catastrophic — through shingles likely | Emergency inspection |
| Softball | 4.00"+ | Structural damage possible | Emergency inspection |
Why 0.75" Is The Key Threshold
Insurance adjusters and roofing engineers generally agree that 0.75 inches (dime-sized) is where measurable damage to standard asphalt shingles begins. Below that, the granule loss is typically within normal weathering tolerance. Above it, the granule displacement is sufficient to expose the asphalt mat to UV radiation and begin the degradation cycle.
This is why Shingleprint filters NOAA data to hail events of 0.75" and above. Below that threshold, the data is informational but not actionable for most homeowners with standard shingle roofs.
Cosmetic vs Functional Damage
This distinction matters enormously for insurance claims. Cosmetic damage affects appearance but not performance — dents in gutters, minor granule loss, surface marks. Some policies specifically exclude cosmetic-only damage.
Functional damage affects the roof's ability to perform its job — keeping water out. This includes significant granule loss exposing the mat, cracking, bruising that compromises waterproofing, and anything that reduces the roof's remaining lifespan.
A licensed roofing inspector distinguishes between the two in their report. If your insurer denies a claim as "cosmetic only," a second opinion from a Haag-certified inspector is worth getting — especially for events over 1.75 inches.
Impact-Resistant Shingles
Class 4 impact-resistant shingles (the highest rating) can withstand 2-inch steel ball drops without cracking. In high-risk markets like Dallas, OKC, and Denver, many insurers offer premium discounts of 20–30% for impact-resistant roofs. If you're replacing a roof in a hail-prone area, the upgrade cost is almost always recovered within 3–5 years through premium savings alone.
Radar vs reality: NOAA radar estimates hail size from reflectivity — not direct measurement. The size shown in your Shingleprint report is the radar-estimated maximum in your area, not a confirmed measurement at your roof. A professional inspection confirms actual impact at your property.
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