For most Colorado homeowners, yes — Class 4 impact-resistant shingles are worth it. They stand up to hail far better than standard shingles, and many Colorado insurers offer a lasting premium discount (often around 20–30%) for installing them. In one of the most hail-prone regions in the country, the combination of fewer future claims and an ongoing discount usually outweighs the modest upcharge — especially when you’re already replacing the roof after a storm.
What “Class 4” actually means
Class 4 is the highest impact rating under the UL 2218 test, where a steel ball is dropped on the shingle to simulate hail. A Class 4 shingle survives the impact without cracking. Products like Owens Corning Duration STORM use a reinforced construction (SureNail technology with an added polymer layer) to hit that rating while still looking like a normal architectural shingle.
The case for upgrading in Colorado
- Insurance discount: most Colorado carriers reduce your premium for a verified Class 4 roof — a savings that repeats every year you own the home
- Fewer claims and deductibles: a roof that shrugs off moderate hail means fewer replacements and fewer times paying that deductible
- Longer real-world lifespan in a high-impact climate
- Resale: a documented Class 4 roof is a selling point to Colorado buyers who know the hail risk
The honest caveats
- They cost more up front than standard architectural shingles — though the gap is smaller when it’s part of an insurance-covered replacement
- Class 4 resists hail; it isn’t hail-proof. Very large hail can still cause damage
- You’ll need to give your insurer the product documentation to actually get the discount — don’t skip that step
Common questions
How much do Class 4 shingles cost extra?
The upcharge over standard architectural shingles is usually modest, and it’s often partly or fully offset by the insurance discount over a few years — plus it’s smaller when bundled into a claim-covered replacement.
Which insurers give a discount in Colorado?
Most major carriers do, though the amount varies. Ask your agent about their impact-resistant roof discount and what documentation they need.
Is Owens Corning Duration STORM a Class 4 shingle?
Yes. Duration STORM is a Class 4 impact-resistant architectural shingle, which is why it’s a popular choice for Front Range roofs.
We install Class 4 roofs across the Front Range. Josh Brooks Construction and Renovation Inc. (License CON-24-0152, in business since 2014, 30 years in construction) can walk you through whether the upgrade pencils out for your home and insurer. Serving Boulder, Weld, Larimer, Jefferson, and Douglas Counties — call 720-828-7997 or text 720-453-5095.
Colorado Class 4 shingle insurance discount: what the law says
- Colorado law (CRS 10-4-110.8) requires insurers to factor impact-resistant roofing into their premium rates — the legal basis for the Class 4 discount.
- In June 2026, SB26-155 created the Strengthen Colorado Homes Enterprise; starting 2027, insurers must prove resilient-roof savings actually reach homeowners.
- Carrier discounts typically run 15–35% (about 28% on average), applied to the dwelling or the wind/hail portion of the premium.
- Class 4 is the top rating under UL 2218: a 2-inch steel ball dropped 20 ft must not crack the shingle.
- The upgrade typically pays for itself in roughly 3–7 years through premium savings.
Sources: Colorado Revised Statutes 10-4-110.8; Colorado SB26-155 (2026); UL 2218 standard; Colorado Division of Insurance / RMIIA (2026).
