"Impact-resistant" roofing materials earn additional insurance discounts in most Florida policies. The label is not arbitrary — it reflects performance against a specific test method (UL 2218) at four ascending levels. Class 4 is the highest. Class 4 materials drive the largest discount.
What UL 2218 measures
The test drops steel balls of progressively larger diameter onto roofing material specimens from progressively greater heights. The specimen must show no cracks, splits, or splits visible from the underside to pass each class.
- Class 1: 1.25" ball from 12 feet
- Class 2: 1.5" ball from 15 feet
- Class 3: 1.75" ball from 17 feet
- Class 4: 2" ball from 20 feet
A Class 4 designation is meaningful: it indicates the material can survive substantial hail and wind-driven debris impact without primary failure.
What qualifies in Florida
Class 4
- Most metal panel systems (standing-seam aluminum, copper, zinc, Galvalume)
- Premium designer asphalt shingles (specific products from GAF, CertainTeed, Owens Corning, IKO carry Class 4 ratings)
- Slate (natural)
- Most synthetic slate (DaVinci, Brava — verify product-specific ratings)
- Many concrete and clay tile profiles when installed per the approved attachment method
Class 3 or lower
- Standard architectural asphalt (most builder-grade products)
- Some older tile profiles that have not been re-tested under current standards
- Lightweight metal roofing in residential gauges
The insurance discount
For most Florida carriers, a Class 4 designation on the wind-mitigation report unlocks an additional discount of 4-15% on the wind component of the premium. On a $4,000 annual wind premium, that is $160-$600 per year.
The discount is not automatic. The wind-mitigation inspector must check the appropriate box on the OIR-B1-1802 form and reference the product's Class 4 documentation. If your roof was installed with Class 4 material but the inspector did not document it, you are not getting the discount.
How to claim it correctly
At installation: keep the manufacturer's UL 2218 certification documents in the closeout package. These are the source documents.
At inspection: provide the documents to the wind-mitigation inspector before the inspection. They will reference the product's class rating on the form.
With your insurance carrier: confirm the discount appears on your declarations page. If it does not, request a corrected wind-mitigation form from your inspector and submit it.
What this means at specification time
For new roofs or re-roofs in Florida, we recommend Class 4 material specifically because the insurance discount substantially offsets the cost differential. A Class 4 clay tile costs marginally more than a Class 3 equivalent; the insurance discount typically returns the differential within 3-5 years.
Class 4 should be the default specification, not the premium upgrade.
A note on hail
Florida does not see hail at the rate that, say, central Texas does. The Class 4 designation here is more about wind-driven debris than direct hail impact. Both are real; both are mitigated by the same material standard.
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