If you replace a roof in Tulsa County in 2026 and you don't put a Class 4 shingle on it, you should have a reason. Here's the whole argument, with numbers.
What the rating means
UL 2218 is the impact test: a steel ball dropped from a fixed height onto the shingle, twice in the same spot, then the shingle's back is inspected for cracks in the mat. Class 1 uses a 1¼-inch ball, Class 2 a 1½-inch, Class 3 a 1¾-inch, and Class 4 a 2-inch ball from twenty feet. A Class 4 shingle passes with no crack. That's roughly the energy of two-inch hail — the May 19, 2025 storm in Broken Arrow — and far more than the quarter-to-golf-ball hail that makes up most Green Country events. Manufacturers get there with SBS polymer-modified asphalt, which stays flexible where standard asphalt gets brittle, so the shingle dents and recovers instead of cracking.
What it costs
On a typical Broken Arrow roof of 25 to 32 squares, the Class 4 version of a major architectural line costs $2,000 to $4,000 more than the standard version — $11,500 to $20,000 versus $9,800 to $16,800 installed in 2026. The installation is identical; the money is in the shingle. Designer Class 4 lines (thicker, slate or shake profiles) run $16,000 to $27,000.
What the insurer gives back
Oklahoma doesn't mandate a Class 4 discount, but nearly every carrier writing homeowners here offers one, applied to the wind-and-hail portion of the premium: commonly 5 to 25 percent of that portion, occasionally more. On a Broken Arrow policy with a $2,500 premium, that's typically $150 to $500 a year. Some carriers now go further — requiring a Class 4 roof (or accepting an ACV roof schedule instead) to write a new policy in the 918 at all — and several will move a roof from ACV back to replacement-cost coverage when it's Class 4. Ask your agent for the exact number before you choose; we give you the manufacturer's certification form and product data sheet to send them.
The payback
Take the middle of everything: a $3,000 upgrade and a $300-a-year discount. That's a ten-year payback on the discount alone, on a roof that should last twenty-five. But the discount isn't the real return. The real return is the claim you don't file: a standard shingle roof in south Broken Arrow has been replaced on average every ten to twelve years since 2010, each time with a deductible that is now $4,000 to $8,000 on most policies, a claim on your record, and a week of your life. A Class 4 roof installed in 2026 has a realistic shot at going through the next three or four hail events without a functional claim. One avoided deductible pays for the upgrade twice.
Which shingles qualify
Every major manufacturer has a Class 4 line, and the ones we install most in Broken Arrow are Owens Corning Duration FLEX, GAF Timberline AS II, Malarkey Vista and Legacy, CertainTeed NorthGate ClimateFlex and Landmark IR, and Atlas StormMaster. They come in the same weathered-wood, charcoal, driftwood and slate colors as the standard lines, so HOA approved-color lists — Forest Ridge, Battle Creek, Southern Trails, Indian Springs — are rarely an issue. Check the wrapper: the shingle should say 'UL 2218 Class 4' or 'Impact Resistant' on it, and the certification form comes from the manufacturer, not the roofer.
Class 4 versus FORTIFIED — and both
Class 4 is the shingle's hail rating. FORTIFIED is a build standard for the whole roof — sealed deck seams, ring-shank nails, enhanced edges, an independent evaluator — aimed at wind and water rather than hail. They're not competitors; the best roof in Tulsa County is a FORTIFIED build with a Class 4 shingle on it, which earns both discounts (FORTIFIED runs 3 to 42 percent depending on the carrier) and qualifies for the state's OKReady grant of up to $10,000. FORTIFIED details.
The honest caveats
Class 4 shingles can still be marked by very large hail, and a carrier can still call marks cosmetic. They don't stop wind damage — that's nailing and FORTIFIED. And the discount varies enough by carrier that it's worth a phone call to your agent before you decide; a few carriers give very little, and if yours is one, you might shop the policy along with the roof.
Related questions
Are Class 4 shingles worth it on a rental?
Usually — the discount applies, the tenants don't call about leaks after every storm, and the roof isn't back on a claim in ten years. If you're selling in two years, standard shingle and keep the difference.
Will Class 4 lower my premium right away?
Once your agent has the manufacturer's certification form. Most carriers apply it at the next renewal; some pro-rate it immediately. We hand you the form the day the roof is done.
Do metal roofs count as Class 4?
Most steel roofing panels carry a UL 2218 Class 4 rating, so yes — the same discount generally applies, though carriers increasingly exclude cosmetic dent damage on metal. Ask.
Can I get Class 4 on an insurance claim roof?
Yes. The carrier pays for the standard roof and you pay the upgrade — $2,000 to $4,000 — and a few carriers contribute to it because it lowers their future losses. Ask your adjuster.
Is a 'Class 3' shingle good enough?
It's better than nothing, but Oklahoma carriers give the discount for Class 4 and the price difference between 3 and 4 is small. Go to 4.
Does Class 4 change the warranty?
The manufacturer's limited lifetime warranty is the same or slightly better on most Class 4 lines, and the algae and wind coverage that comes with the line carries over. Register it in your name — we do that for you.