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Class 4 Impact-Resistant Shingles in Colorado: A Buyer's Guide

Class 4 is the highest impact rating a roof covering can earn under UL 2218. On the Colorado Front Range — some of the most hail-prone real estate in the United States — a Class 4 shingle is often the single most consequential material choice a homeowner makes. This guide explains the rating, its limits, and the real Class 4 products cataloged here.

What "Class 4" means

Impact resistance for roof coverings is graded by UL 2218, a steel-ball drop test. A steel ball is dropped onto the sample and the underside is inspected for cracking, splitting, or rupture. The classes run 1 through 4, and Class 4 is the highest: to earn it, a product must withstand a 2-inch steel ball dropped from 20 feet — struck twice on the same spot — without the reverse side cracking. (An alternate standard, FM 4473, uses launched ice balls.)

Critically, an impact class is a laboratory measure of a covering's resistance to a standardized strike. It is not a warranty against hail damage: large, wind-driven, or repeated hail can still cause functional or cosmetic damage to a Class 4 roof. See the Class 4 Impact-Resistant Shingle material entry for the full spec.

Why it matters in Colorado

The Front Range sits in what insurers and researchers call "hail alley." Because impact-resistant roofs reduce hail losses, many Colorado property insurers offer a premium credit or discount for a documented Class 4 roof — a discount you must confirm directly with your carrier, since terms vary. The Insurance Institute for Business & Home Safety (IBHS) maintains the research and ratings behind these programs.

Browse every impact-resistant option in the directory via the Class 4 impact-resistant materials hub. Impact-resistant asphalt shingles are frequently SBS-modified ("rubberized") so the mat stays flexible through Colorado's wide temperature swings.

Real Class 4 products in this directory

These cataloged products carry a UL 2218 Class 4 impact rating (confirm the current rating on each manufacturer's spec sheet before you buy):

Note the difference between impact and fire: Class 4 is impact (UL 2218); Class A is fire (UL 790 / ASTM E108). Most of the products above are also Class A fire-rated — see Wind & Fire Ratings Explained.

How to verify a rating before you buy

Ask the contractor for the product's data/spec sheet and confirm it states UL 2218 Class 4 for the specific line and color you are buying (some manufacturers rate only certain lines). Keep that documentation — your insurer will typically want proof of the Class 4 product to apply any premium credit, and you will want it again at claim time. For how a covered hail claim interacts with a Class 4 upgrade, see How to File a Roof Insurance Claim After Hail.

Frequently asked questions

Does a Class 4 shingle guarantee my roof will not be damaged by hail?

No. UL 2218 Class 4 is a standardized laboratory impact test (a 2-inch steel ball dropped from 20 feet without the underside cracking). It reduces the likelihood of damage but does not guarantee it — large, wind-driven, or repeated hail can still cause functional or cosmetic damage.

Will a Class 4 roof lower my home insurance premium in Colorado?

Many Colorado insurers offer a premium credit or discount for a documented Class 4 impact-resistant roof, but it is not universal. Confirm the specific discount and documentation requirements directly with your carrier.

Is Class 4 the same as a Class A fire rating?

No. Class 4 is the highest impact rating under UL 2218. Class A is the highest fire rating under UL 790 / ASTM E108. They are separate tests, and a product can carry both.

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