Why Class 4 Impact Shingles
(And Your Insurance Discount).

If you live in Ohio, Northern Kentucky, or anywhere along the Midwest hail belt, your roof is going to take a beating eventually. The question isn't if hail hits — it's whether the shingles on your roof can shrug it off without cracking. That's where the UL 2218 Class 4 impact rating comes in, and why most major insurance carriers offer a premium discount when you put Class 4 on your house.

This is the guide I wish every homeowner read before they signed for a roof. It explains what Class 4 actually means, which carriers offer the discount, and how to claim yours after the install. Quick disclosure: I'm a roofer, not an insurance agent. Confirm everything below with your specific carrier before you sign.

What is the UL 2218 Class 4 rating?

UL 2218 is the impact-resistance test for roofing materials. Underwriters Laboratories drops a steel ball from progressively higher heights onto a test shingle and grades how the shingle survives:

• Class 1: Survives a 1.25-inch ball dropped from 12 feet
• Class 2: Survives a 1.5-inch ball dropped from 15 feet
• Class 3: Survives a 1.75-inch ball dropped from 17 feet
• Class 4: Survives a 2-inch steel ball dropped from 20 feet — without cracking the shingle's surface

Class 4 is the highest classification available for asphalt shingles. The shingle has to keep its waterproof seal AND not visibly crack to pass. Real-world translation: a Class 4 shingle that takes a direct hit from baseball-sized hail will usually look fine the next morning. A Class 3 shingle in the same spot will have circular bruise marks where the granules got knocked off — and those bruise marks turn into leaks 12-18 months later.

Why this matters in Cincinnati and Northern Kentucky

The Midwest hail belt runs right through here. Spring and early summer storms drop hail every couple of years, and a single bad storm can total an entire neighborhood's roofs. I've seen rows of homes file claims back-to-back after a single April storm in Anderson Township. Putting Class 4 shingles on your roof doesn't make hail bounce off — it makes the shingle survive the hit. Your claim history stays clean, your roof stays watertight, and you don't burn through deductibles every few years.

The Insurance Premium Discount.

Here's the part that pays for the upgrade. Most major homeowner-insurance carriers in Ohio and Kentucky offer a discount on the wind/hail portion of your premium when you install UL 2218 Class 4 shingles. The savings depend on your carrier, your ZIP code, and your specific policy — but the discount is real and it stacks every year.

Typical savings I've seen for homeowners in Greater Cincinnati after switching to a Class 4 roof:

• $60–$100/year on smaller policies (1,200–1,800 sq ft homes)
• $120–$200/year on average-sized homes (2,000–2,800 sq ft)
• $200–$300+/year on larger homes or higher-coverage policies

The math: most homeowners pay back the cost difference between a Class 3 architectural shingle (Timberline HDZ) and a Class 4 (Timberline UHDZ) somewhere in the 5–10 year range just from the insurance discount. After that, it's pure savings on top of a tougher roof. Plenty of homeowners I've installed UHDZ for tell me the discount turned a "premium upgrade" into a no-brainer.

Which Ohio & Kentucky Carriers Offer It?

Most major carriers offer some form of impact-resistant discount. The exact name and amount vary — call your specific agent and ask. From what homeowners have told me over the past few years:

• State Farm — generally offers a discount under their "Impact-Resistant Roof" program in Ohio and Kentucky
• Allstate — typically offers a hail-resistant roofing credit
• Erie Insurance — strong presence in Ohio, often offers an impact-resistant discount
• Cincinnati Insurance — local Ohio carrier, often discount-friendly for documented Class 4 installs
• Nationwide — typically offers a hail-resistant discount
• Liberty Mutual — varies by state and policy
• USAA (military families) — typically offers a discount
• Travelers — typically offers a discount

Don't assume your carrier offers it — and don't assume the discount is the same as your neighbor's. Call your agent, ask the question, get the answer in writing, and get the dollar amount before you sign your install paperwork. If your current carrier doesn't offer the discount, that's a separate conversation worth having (some homeowners switch carriers when the savings are big enough).

How to Claim the Discount After You Install.

1. Before install — call your agent. Ask: "Do you offer a discount on the wind/hail portion of my premium for installing UL 2218 Class 4 impact-resistant shingles?" Get the answer in writing (email is fine). If yes, ask what documentation they need.
2. Install Class 4 shingles. I install GAF Timberline UHDZ as my Class 4 line — it's GAF's premium architectural shingle with the UL 2218 Class 4 rating. More on UHDZ here.
3. Get the GAF Certificate of Installation. When I close out a UHDZ install, I provide a certificate showing the product, install date, your address, and the UL 2218 Class 4 rating. That's the document your insurance carrier needs.
4. Submit the certificate to your carrier. Most accept it via email or their app. The discount typically takes effect on your next renewal — sometimes sooner.
5. Verify the discount applied. Your renewal paperwork should show the impact-resistant discount as a line item. If it doesn't, call your agent — don't let it slide.

What Class 4 Doesn't Get You.

Setting expectations honestly:

• It's not a deductible discount. Class 4 lowers your premium, not your hail-claim deductible. If hail still cracks the shingles (very large hail, 2.5+ inches, can do it), you still pay your deductible to file a claim.
• It's not a guarantee. Class 4 is a laboratory rating with a steel ball — real hail comes in at angles, with wind, in sheets. A direct hit from softball-sized hail will damage even Class 4. The rating dramatically reduces hail damage, but doesn't eliminate it.
• The discount isn't free money. Class 4 shingles cost more upfront than Class 3. The math works because the discount stacks year after year and the roof outlasts the payback period — but you should run your own numbers, not just take a sales pitch.
• It's not retroactive. If you already have a Class 3 roof and just realized you could've gotten the discount, your only option is to upgrade on the next replacement. There's no way to "get credit" for a Class 4 roof you don't actually have.

Why I Install GAF Timberline UHDZ for Class 4.

I'm a GAF Certified™ Contractor and I install GAF Timberline UHDZ as my Class 4 pick. A few honest reasons:

• Same LayerLock™ install technology as the standard Timberline HDZ — meaning the install crew handles it the same way and there's no learning curve that could compromise the install quality
• StainGuard Plus™ PRO — 30-year algae-streak warranty (longer than HDZ's 25-year)
• WindProven™ Limited Wind Warranty with no maximum wind speed
• Heavier shingle (~360 lb/square versus ~240 lb for HDZ) — more mass means better hail performance and a longer effective lifespan
• The certificate I provide for your insurance claim is GAF-issued — not something I'm generating myself, which means carriers accept it without back-and-forth

You don't have to install GAF UHDZ specifically — any UL 2218 Class 4-rated asphalt shingle qualifies for the discount. But if you're already going with a GAF-Certified contractor (like me), you're getting the System Plus warranty as part of the deal, and UHDZ is the Class 4 option that ships with the strongest GAF coverage.

Quick FAQ.

Does the insurance discount apply if I already have a Class 4 roof from the previous owner?

Possibly. If the previous owner installed Class 4 and you have the manufacturer's certificate (or can request a duplicate from the contractor who did the work), you can submit it. Some carriers will honor it; some require the install to be on your policy from the start. Call and ask.

Can I install Class 4 if I'm replacing a roof through an insurance claim?

Yes — but the carrier may not pay the upgrade cost. Insurance pays for "like-kind-and-quality" replacement. If your old roof was Class 3, they'll pay for Class 3 replacement, and you'd pay the difference out of pocket to upgrade to Class 4. Some carriers offer a Class 4 endorsement that covers the upgrade — ask before you sign.

Will Class 4 shingles last longer than regular shingles?

In hail-prone regions, yes — meaningfully. The shingle itself has the same lifetime warranty as a comparable Class 3 line, but in real-world conditions where hail is hitting it every couple of years, Class 4 effectively outlives Class 3 because it doesn't accumulate granule loss and surface bruising. In a hail-free climate, the difference is smaller.

Do I have to use a GAF Certified Contractor to qualify for the discount?

No — your insurance discount is based on the shingle's UL 2218 Class 4 rating, not the contractor. But using a GAF Certified Contractor unlocks the GAF System Plus warranty (50 years material + workmanship) which most certified-only installers can register. Different benefit, both worth having.