Class 4 Impact-Resistant Shingles, Compared

On the Front Range, the question isn’t whether your roof will see damaging hail — our county records show it lands somewhere nearby about fourteen days a year — it’s what your shingles do when it arrives. Class 4 impact-resistant shingles are the asphalt answer: the same architectural look, tested to the industry’s highest impact standard, usually discounted by your insurer. Here’s how the rating works, how the major products compare, and the honest limits nobody selling them mentions.

What Class 4 Actually Means

The rating comes from UL 2218, a test that is simple and brutal: a 2-inch steel ball — the energy equivalent of a big hailstone — is dropped from 20 feet onto the same spot, twice. No cracking, splitting, or tearing on the front or back of the shingle earns Class 4, the top of the scale. Our Colorado hail damage guide covers how the rating fits into the bigger claims picture.

The best modern Class 4 shingles pass the test with SBS polymer-modified asphalt — “rubberized” asphalt that flexes under impact instead of fracturing. The same chemistry resists cold-weather cracking and the thermal-cycling fatigue that ages standard shingles fast in Colorado’s freeze-thaw swings.

The Four Class 4 Shingles We See Most

All four hold the same UL 2218 Class 4 certificate — the real differences are look, color, weight, wind-warranty terms, and price. We quote the option that fits your home rather than pushing one brand.

The Honest Limits

Class 4 is not hail-proof. The test uses steel balls, not ice; softball-class stones — which our county dataset records a few days a decade — will damage any asphalt roof; and granule scuffing can still occur on stones that don’t compromise the shingle. What the rating reliably buys you is fewer claims from the 1–2 inch hail that does most of the damage most years. If you want a roof that shrugs off nearly everything, that conversation is about stone-coated steel or standing seam — with its own hail caveat about cosmetic denting and insurance exclusions.

The Money: Discounts Now, Grants Coming

Most carriers writing Colorado homeowner policies discount premiums for Class 4 roofs — commonly quoted between 5% and 30% on the dwelling portion. Today those discounts are carrier practice; Colorado’s new resilient-roof law (SB26-155) adds a FORTIFIED-reroof grant fund and requires insurers to show resilient-roof savings reach policyholders in their rate filings starting in 2027. And because the upgrade cost at reroof time is small compared to a percentage hail deductible, the practical playbook is simple: if you’re replacing anyway — after a storm, through an insurance claim, or on age — replace up.

Class 4 Shingles: Your Questions

What makes a shingle Class 4?

Passing UL 2218, the industry’s toughest impact test: a 2-inch steel ball dropped from 20 feet onto the same spot, twice. If the shingle shows no cracking, splitting, or tearing on the front or back, it earns Class 4 — the highest rating there is. The best Class 4 shingles pass it with SBS polymer-modified asphalt that flexes instead of fracturing.

Are Class 4 shingles hail-proof?

No, and be wary of anyone who says otherwise. Class 4 dramatically reduces damage from the 1-to-2-inch hail that causes most Front Range claims, but softball-size stones will damage any asphalt roof, and cosmetic granule scuffing can still happen. Think of Class 4 as cutting your claim odds in the storms you’ll actually see most years — not as armor against the worst day of the decade.

How much more do Class 4 shingles cost?

At reroof time, the upgrade from a standard architectural shingle is a modest fraction of the total job — and typically far less than one percentage-based hail deductible. Since the labor, tear-off, and underlayment cost the same either way, replacement time is the cheap moment to upgrade. We quote both options side by side so you can see the actual delta for your roof.

How do I get the insurance discount for a Class 4 roof?

Ask your carrier before the install, then have your roofer provide the product’s UL 2218 certification and the final invoice. Most carriers writing Colorado policies offer premium discounts or credits for Class 4 roofs — commonly quoted between 5% and 30% on the dwelling portion — and Colorado’s new resilient-roof law (SB26-155) will require insurers to show those savings reach policyholders starting in 2027.

Which Class 4 shingle brand is best?

The four SBS-modified lines we see most — Malarkey Legacy, GAF Timberline AS II, Owens Corning Duration Storm, and CertainTeed NorthGate — all pass the same UL 2218 test. The honest differences are look, color range, weight, wind warranty terms, and price. Pick the one that fits your home and budget; the impact rating is the same certificate.

Do Class 4 shingles help with wind too?

Generally yes — the same SBS-modified flexibility that absorbs hail impact resists wind-driven fatigue, and most Class 4 architectural lines carry high wind ratings when installed with the manufacturer’s high-wind nailing pattern. Installation is the catch: the rating on the wrapper assumes the right nail count and placement, which is an installer decision, not a shingle feature.

Replacing a roof anywhere from Greeley to Loveland? Ask us to quote standard and Class 4 side by side — the delta is usually smaller than people expect. Request a free estimate.