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Class 4 Impact-Resistant Shingles in St. Louis, MO hero image

Class 4 Impact-Resistant Shingles in St. Louis, MO

UL 2218 Class 4 · Insurance Discounts · ArmorShield II · Duration STORM

Residential · Impact-Resistant Shingles

Built for the St. Louis hail market — Class 4 rated, insurance-discount eligible

St. Louis sits in the heart of Midwest hail country. The metro averages three to five significant hail events annually, with events exceeding one inch in diameter not uncommon during spring and early summer storm seasons. For homeowners replacing a roof after hail damage — or proactively upgrading before the next event — Class 4 impact-resistant shingles represent the most significant single upgrade available in standard residential roofing. The UL 2218 testing standard is the benchmark for impact resistance: a two-inch steel ball is dropped from twenty feet onto the shingle surface. Class 4 products pass at the highest drop height without surface fracture or puncture — Class 1 through Class 3 products fail at progressively lower impact energies. The practical implication for St. Louis homeowners: Class 4 shingles resist the surface damage that Class 3 and below products show after a one-inch or larger hail event, reducing the frequency of insurance claims and the likelihood of full replacement after a moderate hail storm. Most major Missouri and Illinois insurance carriers offer premium discounts for homes with Class 4 rated roofs — discounts typically range from 5 to 30 percent depending on the carrier, and Revolve can provide documentation supporting the discount application. Revolve installs GAF Timberline ArmorShield II, Owens Corning Duration STORM, CertainTeed Landmark IR, and IKO Nordic — all Class 4 rated products across the major manufacturer families.

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Why homeowners and businesses trust Revolve

  • UL 2218 Class 4 — what the rating actually tests

    The UL 2218 test drops a two-inch solid steel ball from twenty feet onto the shingle. Class 4 is the highest rating — the shingle shows no fracture, cracking, or puncture. For St. Louis homes, Class 4 means the shingle surface holds up under the hail sizes the metro regularly experiences, preserving granule coverage and waterproof integrity.

  • Insurance discounts — 5 to 30 percent from major MO/IL carriers

    State Farm, USAA, Allstate, and Auto-Owners — among the most common carriers in Missouri and Illinois — offer premium discounts for Class 4 rated roofs. Discounts vary by carrier and policy, typically ranging from 5 to 30 percent. Over a 20-year roof lifespan, those savings meaningfully offset the modest premium over standard shingles.

  • IBHS FORTIFIED Roof alignment

    The Insurance Institute for Business and Home Safety's FORTIFIED Roof program recommends Class 4 impact-resistant shingles as a core component of hail-hardened construction. FORTIFIED certification provides further insurance benefits with participating carriers and demonstrates a verified storm-resistant roof assembly.

What we offer

  • GAF Timberline ArmorShield II

    GAF's Class 4 impact-resistant shingle built on the Timberline platform. Lifetime limited warranty, StainGuard Plus algae resistance, 130-mph wind rating. Same aesthetic profile as standard Timberline HDZ.

  • Owens Corning Duration STORM

    OC's Class 4 impact-resistant shingle on the Duration SureNail platform. Lifetime limited warranty, superior nail pull-through, and the full OC enhanced warranty system available through Preferred Contractor installation.

  • CertainTeed Landmark IR

    CertainTeed's impact-resistant Landmark shingle — Class 4 rated with the full Landmark warranty program and StreakFighter algae resistance. Available in the Landmark color palette.

  • IKO Nordic

    IKO's Class 4 impact-resistant shingle — a competitive option for homeowners seeking Class 4 performance at a moderate price point.

  • Insurance Discount Documentation

    Revolve provides UL 2218 product documentation and installation confirmation for the insurance discount application process — the paperwork your carrier needs.

  • Post-Hail Upgrade Consultation

    After a hail event, Revolve inspects existing shingles and provides a clear picture of whether Class 4 replacement is warranted — and what the insurance discount math looks like over time.

Related Services

Why St. Louis Is the Right Market for Impact-Resistant Shingles

St. Louis receives three to five significant hail events per year. The metro's position in the central US hail belt means that one-inch diameter hail is not unusual during spring thunderstorm season, and events tracking through Chesterfield, Kirkwood, Arnold, and South County have produced widespread residential roof damage requiring insurance claims across thousands of homes in a single afternoon. For St. Louis homeowners, the question of whether Class 4 impact-resistant shingles make financial sense is not abstract — it is a straightforward calculation of upgrade cost versus reduced claim frequency and potential insurance discount.

The UL 2218 standard is the industry-accepted impact resistance test. A two-inch steel ball is dropped from 20 feet onto the shingle surface at four impact points. Class 1 through Class 3 products fail at progressively lower drop heights; Class 4 products pass at the full 20-foot drop without surface fracture, material tearing, or puncture. The Class 4 rating specifically tests resistance to the impact energy produced by two-inch diameter hail — roughly the size at which standard asphalt shingles begin showing visible surface fractures and mat exposure.

The IBHS FORTIFIED Roof program — the Insurance Institute for Business and Home Safety's voluntary certification for hail-hardened construction — includes Class 4 impact-resistant shingles as a core specification. FORTIFIED certification is recognized by a growing number of carriers and provides additional insurance benefits beyond the standard Class 4 discount in some cases.

Insurance Discounts: What to Expect From Major MO/IL Carriers

Missouri and Illinois insurance carriers have broadly recognized Class 4 impact-resistant roofing as a meaningful risk-reduction measure, and most major carriers offer premium discounts for Class 4 rated roofs. The specific discount amounts vary significantly by carrier and policy — ranging from 5 percent at some carriers to 30 percent or more at others. USAA, State Farm, Allstate, and Auto-Owners are among the most commonly held homeowner policies in the St. Louis metro, and all four have established Class 4 discount programs.

The discount typically applies to the wind and hail portion of the homeowner premium — which is a meaningful fraction of total premium in a hail-prone market like St. Louis. Over the 20 to 25-year lifespan of a Class 4 shingle, the accumulated savings can materially offset the modest material premium over standard shingles. Revolve calculates the break-even timeline for homeowners considering the upgrade, using carrier-specific discount information where available.

To receive the discount, the carrier requires documentation confirming the Class 4 product installed. Revolve provides a document specifying the shingle product, UL 2218 Class 4 rating, installation date, and certifying contractor — everything the carrier needs for the discount application.

Product Comparison: ArmorShield II, Duration STORM, Landmark IR, and IKO Nordic

GAF Timberline ArmorShield II is built on the Timberline HDZ platform — the most widely installed shingle base in the US — with the addition of a modified shingle construction that achieves Class 4 rating. It carries the Timberline Lifetime limited warranty, StainGuard Plus algae resistance, and the full LayerLock/SureNail equivalents built into the HDZ platform. For homeowners already oriented toward GAF, ArmorShield II is the natural Class 4 specification.

Owens Corning Duration STORM uses the SureNail Technology platform with a modified granule bond for Class 4 performance. The visual and warranty profile is identical to standard Duration — the Class 4 rating is transparent to the aesthetic outcome. Duration STORM is Revolve's standard recommendation for OC customers replacing a roof after a hail event.

CertainTeed Landmark IR is the Class 4 version of the Landmark shingle — same profiles, colors, and StreakFighter algae warranty, with the impact upgrade. Available to Select ShingleMaster installers with the full SureStart Plus warranty program. IKO Nordic is a competitive Class 4 option from a major manufacturer — a good selection for homeowners seeking Class 4 performance at a price point that competes with the major manufacturer lines.

Frequently Asked Questions

1. What does UL 2218 Class 4 actually test?
UL 2218 drops a two-inch solid steel ball from 20 feet onto the shingle surface at four different points. A Class 4 rating means the shingle shows no fracture, cracking, splitting, or puncture after all four impacts. Classes 1 through 3 fail at progressively lower drop heights. Class 4 is the highest available rating.
2. How much of an insurance discount can I expect in Missouri for a Class 4 roof?
Discounts vary by carrier and individual policy. In Missouri and Illinois, major carriers typically offer 5 to 30 percent on the wind and hail portion of the premium. USAA and Auto-Owners tend to be at the higher end of this range. Contact your carrier or agent to confirm the specific discount for your policy — Revolve provides the installation documentation you need.
3. Is Class 4 a visible difference from a standard shingle?
No. Class 4 products from GAF, Owens Corning, and CertainTeed are available in the same colors and profiles as their standard equivalents. The impact resistance comes from modified construction and granule bonding — not from an aesthetic difference.
4. Does a Class 4 roof eliminate hail damage completely?
No. Class 4 rating means the shingle resists surface fracture from two-inch hail — it does not mean the shingle is impervious to all hail. Very large hail (two-plus inches) can still damage Class 4 shingles. The upgrade significantly reduces damage frequency from typical St. Louis hail events (typically 0.75 to 1.5 inches) and extends the interval between replacement-triggering claims.
5. What is IBHS FORTIFIED Roof and should I pursue it?
IBHS FORTIFIED Roof is a voluntary certification program for storm-resilient construction. It specifies Class 4 impact-resistant shingles as a core component, plus sealed decking, and a designated third-party inspector to verify compliance. FORTIFIED certification provides additional insurance benefits with participating carriers and documents the storm-resistant construction of the roof. For homeowners who want the highest level of verified hail resistance and maximum insurance benefit, it is worth pursuing. Revolve can guide the specification and documentation process.
6. Does a Class 4 shingle cost significantly more than a standard shingle?
Typically 10 to 20 percent more in material cost. On a 2,000-sq-ft St. Louis home, the upgrade premium is usually $300 to $800 in material cost. Given a typical insurance discount of 10 to 20 percent on the annual premium, the payback period is often 2 to 5 years — after which the discount is net positive against the upgrade cost for the life of the roof.

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