Class 4 Shingles and Oklahoma Insurance Discounts
Class 4 is the top impact rating under UL 2218, earned when a two inch steel ball dropped on the shingle leaves no crack or rupture in the mat. In Tulsa the upgrade adds roughly $1,800 to $4,200 to a replacement, reviewed September 2026. Many Oklahoma carriers discount the wind and hail portion of the premium for a Class 4 roof, and the amount varies by carrier.
Every shingle salesperson in Green Country has a Class 4 pitch, and most of them lead with the discount. Start with the test instead, because the test is what the rating means and the discount is what one particular company decides to do about it.
How is the rating earned?
UL 2218 is a standard published by UL Solutions called Impact Resistance of Prepared Roof Covering Materials. A sample deck is built with the roofing material on it, then steel balls are dropped from a fixed height onto several spots on the same sample, including over joints and edges. The ball size sets the class.
| Class | Steel ball diameter | Rough hail equivalent |
|---|---|---|
| Class 1 | 1.25 inches | Marble to penny |
| Class 2 | 1.5 inches | Walnut |
| Class 3 | 1.75 inches | Golf ball |
| Class 4 | 2.0 inches | Hen egg or larger |
The drop height is set so the ball carries roughly the kinetic energy a hailstone of that size would have falling in a thunderstorm. After the impacts, the sample is inspected from the back. To pass, there can be no rupture, crack or tear through the material. Dents and surface bruising are allowed. Class 4 is the highest rating the standard issues, and IBHS has published its own summary of relative impact resistance across asphalt shingle products tested to it.
Read that carefully, because it sets your expectations. A Class 4 shingle is a shingle that does not split when a two inch ball hits it. It is not hail proof, and a large enough stone at the wrong angle will still mark it.
What does the upgrade cost in Tulsa?
Added on top of a standard architectural shingle replacement, a Class 4 laminate runs about $1,800 to $4,200 more for a typical 20 square roof, reviewed September 2026. The spread comes from the product line and from how many slopes and penetrations the crew has to work around.
Against a $10,500 to $17,000 base replacement, that is a 15 to 30 percent premium on the roof.
How does the insurance discount actually work?
Here is the mechanism, in plain terms. Hail losses are the single largest driver of homeowners premiums in Oklahoma. A roof that survives hail without needing replacement is a roof that does not generate a claim. Carriers price that risk reduction, so most of them file a credit that applies to the wind and hail portion of your premium when the property has a qualifying impact resistant roof.
Three things follow from that.
The credit applies to part of your premium. It is a percentage of the wind and hail component rather than of the whole bill, so a headline percentage sounds larger than the dollars that come off.
The amount is set by the carrier. Every company files its own rate and its own credit. Two neighbors on the same cul de sac in Jenks with identical roofs can get different numbers because they are with different companies. There is no single Oklahoma figure, and anyone who quotes you one is guessing.
You have to prove it. Carriers ask for the manufacturer’s product data sheet showing the UL 2218 Class 4 designation, the invoice, and sometimes photographs of the wrapper or the shingle stamp. Keep all of it. Your roofer should hand you that paperwork at the end of the job without being asked.
Call your agent before you order shingles. Ask three questions: what is your impact resistant roof credit, does it apply to my wind and hail deductible or to the premium, and what documentation do you need. Then you have a real number to put against the real upgrade cost.
Is there a state program worth knowing about?
Yes. The Oklahoma Insurance Department runs the Strengthen Oklahoma Homes program, which offers grants toward retrofitting a home to the IBHS FORTIFIED Roof standard with the hail supplement. FORTIFIED goes further than the shingle: enhanced roof deck attachment, a sealed roof deck, locked down roof edges, impact resistant shingles and wind and rain resistant attic vents, verified by an independent evaluator.
Grant amounts, eligibility and application windows are set by the department, so check the current terms on their own site rather than taking a contractor’s word for it. The department points to premium savings for homes that earn the FORTIFIED designation, and the credit still comes from your carrier, so the same question applies: ask your agent what they will actually take off.
Doing the math on your own house
Work it out with your own numbers rather than a rule of thumb.
- Get the Class 4 upgrade price in dollars from your written estimate.
- Get your current annual premium, and ask your agent what it would be with a Class 4 roof.
- Divide the upgrade cost by the annual saving. That is your break even in years.
- Add the value of not paying a wind and hail deductible on the next marginal storm, since a Class 4 roof is likelier to come through a one inch event without a claim.
- Weigh how long you plan to own the house.
If you are staying fifteen years in a Bixby acreage house with a big roof, the case usually makes itself. If you are selling in three, it is closer, though the roof is still a selling point in this market.
Where Class 4 does less for you
Impact resistance does nothing for wind uplift, which is a separate rating, and nothing for bad flashing or a failed pipe boot. Most leaks we see in Tulsa start at a penetration rather than in the field of the roof. A Class 4 shingle over a sloppy install is still a sloppy install. Check the underlayment, the valley detail and the ventilation plan on your estimate with the same attention you give the shingle name.
Also note that some carriers only apply the credit to shingles, and some extend it to metal roofing that carries a Class 4 designation. Ask.
If you are replacing anyway
The upgrade is cheapest at the moment the roof is coming off, because the labor is already in the price. Our roof replacement page lists what goes on a standard build and what changes when you go to a Class 4 laminate. We will quote both prices on the same estimate so you can take the numbers straight to your agent.