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What Are Class 4 Impact-Resistant Shingles?

By Best Colorado Roofing Published November 5, 2026 Hail & Insurance

Class 4 impact-resistant shingles are asphalt shingles engineered and tested to survive hail impacts that destroy ordinary shingles. In Colorado's hail corridor, they're the single most-discussed roofing upgrade. Here's what the rating means, how these shingles are built, and what they can — and can't — do.

The rating: UL 2218 Class 4

UL 2218 is the industry standard test for shingle impact resistance. It drops steel balls of increasing size onto shingles — Class 4, the highest rating, means the shingle survived impacts from a 2-inch steel ball dropped from 20 feet without cracking or rupturing. Classes run 1–4; most standard architectural shingles don't carry a UL 2218 rating at all. The rating is about the shingle's ability to resist fracture — the kind of damage that becomes a leak.

How they're built

Class 4 shingles achieve the rating through tougher construction: polymer-modified (rubberized) asphalt that's more flexible and impact-absorbing than standard asphalt, reinforced mats, and heavier overall build. The flexibility is the key — where a standard shingle's brittle mat fractures under a hailstone, the modified asphalt absorbs and distributes the impact. They're still asphalt shingles: installed the same way, looking similar from the street.

Why Colorado hail country cares

Along the Front Range hail corridor — Denver, Aurora, Colorado Springs — hail isn't a freak event; it's a seasonal expectation. Class 4 shingles reduce the odds that a given storm functionally damages your roof, which means fewer repairs, fewer claims, and longer service life in exactly the conditions Colorado delivers. Many insurers recognize the rating with premium considerations — but that varies by insurer and policy, so verify with your agent rather than assuming. They're not hail-proof (nothing is), but they're hail-resistant in a meaningful, tested way.

One call connects you. Best Colorado Roofing is a lead-generation platform — call the number on this site to be connected with an independent roofer. See Class 4 shingles in Colorado and hail damage roofing.

FAQs

Are Class 4 shingles worth it in Colorado?

In the hail corridor, many homeowners and roofers say yes — the upgrade cost is modest relative to a roof replacement, and the protection matches the actual threat. Outside heavy-hail areas the math is less compelling.

Do Class 4 shingles look different?

No — they look like standard architectural shingles. The difference is in the materials, not the appearance.

Considering Class 4 for hail country?

One call connects you with an independent roofer who installs impact-resistant shingles — no forms, no waiting.

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