Class 4 vs Class 3 shingles: the Texas hail and insurance guide.
What the UL 2218 impact rating actually means, how Class 4 shingles perform in San Antonio and Austin hail events, and the homeowners insurance premium discount available when you install them.
Texas leads the country in hail-related insurance losses. Choosing a Class 4 impact-resistant shingle over a standard Class 3 product is one of the few roofing decisions that pays you back twice — fewer storm claims and a lower wind/hail premium.
What UL 2218 actually tests
UL 2218 is the industry-standard impact test for steep-slope roofing. A steel ball is dropped onto the shingle from a set height; a product earns its Class rating only if the surface shows no cracks, splits or back-side damage after the impact.
Class 4 vs Class 3 at a glance
| Factor | Class 3 | Class 4 |
|---|---|---|
| UL 2218 test | 1.75" steel ball, 17 ft drop | 2.0" steel ball, 20 ft drop |
| Hail resistance | Good — resists ~1" hail | Excellent — resists 1.5"+ hail |
| Granule loss in storms | Moderate | Significantly reduced |
| Typical warranty | 25–30 years | Lifetime (limited) |
| TX insurance discount | Rare | 10–35% on wind/hail portion (most carriers) |
| Upgrade cost (avg residential) | Baseline | +$500–$1,500 |
The Texas insurance discount, explained
Texas carriers don't all advertise it loudly, but most major homeowners insurers offer an impact-resistant roof discountwhen you install a UL 2218 Class 4 shingle and provide a manufacturer certificate. In San Antonio, Austin and the surrounding hail-prone counties the discount commonly lands between 10% and 35% on the wind/hail portion of the premium — sometimes more.
- Ask your agent to quote your policy WITH and WITHOUT the IR discount in writing.
- Send your agent the Class 4 manufacturer certificate after installation — the discount is rarely applied automatically.
- Some carriers reset the discount when the policy renews; recheck annually.
- Class 4 alone does not waive your wind/hail deductible.
Frequently asked questions
Both ratings come from UL 2218, the standard impact test for roofing. Class 3 shingles survive a 1.75-inch steel ball drop without cracking; Class 4 survive a 2-inch steel ball drop — roughly 30% more impact energy. In hail-prone Texas markets that translates to noticeably better resistance to denting, granule loss and bruising during storms.
Most major Texas carriers (State Farm, Allstate, USAA, Farmers, Travelers and others) offer an impact-resistant roof discount of roughly 10–35% on the wind/hail portion of your premium when you install a UL 2218 Class 4 product. Discounts vary by carrier, ZIP code and policy form — ask your agent in writing before purchase.
Class 4 shingles typically add $500–$1,500 to a residential roof versus a comparable Class 3 product. In Bexar, Hays, Comal, Travis and Williamson counties — where 1-inch+ hail is common — the combination of premium discount, longer life and reduced storm damage usually pays back the upgrade within 3–5 years.
We install several UL 2218 Class 4 lines from GAF (Timberline AS II), Owens Corning (Duration Storm/FLEX), Atlas (StormMaster Shake/Slate), Malarkey (Vista/Legacy) and CertainTeed (Landmark IR). The right product depends on slope, roof color, ventilation and the discount your carrier honors.
We'll inspect your existing roof, model the Class 4 upgrade cost against your current premium, and document everything your carrier needs to apply the discount. Schedule a free inspection or read more in our Insurance Resource Center.
Educational only. Not legal, tax, or coverage advice. Discount percentages and eligibility vary by carrier and policy form.
Upgrade to Class 4 with a Texas-licensed roofer.
Free inspection, Class 4 product options from GAF, Owens Corning, Atlas, Malarkey and CertainTeed, and the paperwork your carrier needs for the discount.
830-228-6123