Class 4 Shingles in Colorado: A UL 2218 Buyer's Guide

April 2026 · Roofing · 6 min read

Class 4 impact-resistant shingles on a Colorado roof

If you own a home anywhere along the Front Range, hail is not a question of if but when. Class 4 impact-resistant shingles — shingles that pass the toughest level of the UL 2218 impact test — are designed specifically for high-hail regions like Colorado and parts of Kansas, and many insurance carriers offer premium discounts of five to thirty percent when you install them. Picking the right Class 4 product, however, means understanding what the rating actually measures and how different materials compare.

What UL 2218 Class 4 Actually Means

The Class 4 designation comes from Underwriters Laboratories standard UL 2218. Testers drop a two-inch steel ball from twenty feet onto the shingle surface twice in the same spot. A shingle passes Class 4, the highest rating, if the surface shows no cracking, splitting, or tearing on either the front or the back of the material. Class 1 through Class 3 products fail at smaller ball sizes.

It is worth noting that UL 2218 measures impact resistance, not wind resistance or fire rating. Those have their own standards. A Class 4 shingle is specifically the right choice for hail, not a blanket "best shingle" label.

Why Colorado Homeowners Should Care

Colorado sits in what insurers call the hail belt. The Denver metro area, Fort Collins, Colorado Springs, and points east regularly see hail events large enough to damage standard three-tab or architectural shingles. When a storm drops one-inch or larger stones on a standard roof, the granule layer fractures, the asphalt mat bruises, and the functional life of the roof is cut short even if leaks do not appear immediately.

Class 4 shingles absorb that same impact without cracking. You may still see cosmetic marks after a severe storm, but the waterproofing layer remains intact. For a homeowner, that often means one insurance claim instead of two over the life of the roof.

Insurance Discounts Worth Pursuing

Most major carriers writing policies in Colorado, including State Farm, Allstate, American Family, USAA, and Farmers, offer a premium credit for certified Class 4 roofs. The exact discount varies by carrier and by the specific product, but the range is typically between five and thirty percent off your annual premium. On a policy that costs twenty-five hundred dollars a year, even a ten percent credit adds up quickly over the life of the roof.

To qualify, you will typically need:

A copy of the manufacturer's UL 2218 Class 4 certificate, which we provide after installation.
An installation invoice that identifies the specific product used.
Sometimes a completed impact-resistant roof endorsement form from your carrier.

Send those documents to your agent after your residential roofing project is complete and ask for the endorsement to be added to your policy.

Material Options for Class 4 Shingles

SBS-Modified Asphalt Shingles

Most Class 4 shingles installed in Colorado are SBS-modified asphalt. SBS stands for styrene-butadiene-styrene, a rubberized polymer mixed into the asphalt layer that gives the shingle flexibility. Instead of cracking on impact, the shingle deforms slightly and rebounds. Popular product lines include IKO Nordic (the Class 4 shingle we lead with), Malarkey Legacy, GAF Grand Sequoia ArmorShield, and CertainTeed Landmark ClimateFlex.

SBS asphalt is the most cost-effective Class 4 option and installs using the same techniques as a standard architectural roof. For most homeowners, this is the default choice.

Stone-Coated Steel

Stone-coated steel panels are shaped to mimic the look of shingles, shakes, or tile but are made from a steel core with an acrylic adhesive and stone chip surface. They carry Class 4 impact ratings and exceptional wind resistance, and they often have fifty-year or lifetime material warranties.

The trade-off is cost: stone-coated steel typically runs two to three times the price of SBS asphalt. It is worth considering if you plan to stay in the home long-term, you want a genuinely hail-proof roof, or your HOA accepts it.

Designer and Luxury Asphalt

Some manufacturers make thicker designer shingles that achieve Class 4 ratings without the SBS modification. These are heavier products with deeper shadow lines that give a dimensional, upscale appearance. They tend to sit between standard SBS and metal on price. Our designer and luxury asphalt shingles page shows which lines come in a Class 4 version.

What to Ask Your Contractor

Not every roofing contractor installs Class 4 as standard. When you get quotes, ask specifically:

Is this shingle UL 2218 Class 4 certified? Ask for the product name and a link to the certificate. "Impact-resistant" is not the same thing.
Will you provide documentation for my insurance company? You need a paper trail to claim the discount.
Is the manufacturer warranty transferable? Some are, some are not. It affects resale value.
What underlayment and fastening pattern are you using? Enhanced fastening (six nails instead of four) paired with synthetic underlayment improves wind performance too.

Is a Class 4 Roof Worth the Premium?

The upfront cost of Class 4 shingles is typically ten to twenty percent higher than standard architectural shingles. In a hail belt, that premium is often recovered through insurance discounts and deferred claim cycles. In a low-hail region, the math is less compelling.

For a Colorado homeowner, the combination of the insurance credit, the reduced risk of mid-life replacement, and the manufacturer warranty almost always makes Class 4 the right call on a new roof.

If you are planning a roof replacement, we install Class 4 products from multiple manufacturers and handle the insurance paperwork for you. Schedule a free roof inspection to see whether your existing roof still has usable life or whether it is time to upgrade.

Class 4 Shingles FAQ

What does UL 2218 Class 4 mean?

UL 2218 is the Underwriters Laboratories impact test for roofing products. Class 4 is the highest of its four ratings: the shingle must show no cracking, splitting, or tearing, front or back, after a two-inch steel ball is dropped from twenty feet twice on the same spot. Lower classes are tested with smaller balls. The rating measures hail impact resistance only, not wind or fire performance.

Do Class 4 shingles lower homeowners insurance in Colorado?

Often, yes. Most major carriers writing policies in Colorado offer a premium credit for a certified Class 4 roof, typically five to thirty percent depending on the carrier and product. You will usually need the manufacturer's UL 2218 certificate and an invoice naming the product, which we provide after installation. Discounts are set state by state, so don't assume the same credit applies elsewhere; State Farm's roofing discount, for example, is not offered in Utah.

How much more do Class 4 shingles cost?

Class 4 shingles typically cost ten to twenty percent more than standard architectural shingles. In Colorado's hail belt that premium is often recovered through insurance discounts and fewer hail claims over the life of the roof.

Which Class 4 shingle do you recommend in Colorado?

For most homes we lead with IKO Nordic, an SBS polymer-modified Class 4 shingle that stays flexible in cold weather. Malarkey Legacy, GAF Grand Sequoia ArmorShield, and CertainTeed Landmark ClimateFlex are strong alternatives, and stone-coated steel or a Class 4 designer shingle fits when you want a different look or a longer service life.