Head-to-Head Comparison
Stone-Coated Steel vs Asphalt Shingles
Stone-coated steel is the middle ground St. Louis homeowners often overlook — it has the visual profile of architectural asphalt or wood shake, the Class 4 impact rating of metal, and a 50-year lifespan at roughly $14–$22/sqft installed. It's not as cheap as asphalt or as architectural as standing seam, but it solves specific problems well.
Our Verdict
Stone-coated steel wins for homeowners who want Class 4 impact resistance and 50-year durability in a product that looks more like traditional shingles than exposed metal panel. For homeowners where upfront cost is the primary driver, standard Class 4 asphalt is $4–$8/sqft less and still gets the insurance discount.
| Dimension | DECRA / Westlake Royal | Architectural Asphalt |
|---|---|---|
| Installed Cost (STL 2026) | $14–$22/sqft Stone-coated steel commands a substantial premium over asphalt. Even against Class 4 asphalt, the gap is $4–$8/sqft — roughly $10,000–$20,000 on a 25-square roof. | $7–$10.50/sqft (standard); $9.50–$14/sqft (Class 4) |
| Impact / Hail Rating | Class 4 UL 2218 (inherent to the product) Stone-coated steel's steel substrate makes Class 4 the baseline, not an upgrade. Every DECRA product qualifies for MO/IL insurance discounts without product tier selection. | Class 1–2 standard; Class 4 IR version available |
| Lifespan | 40–70 years (DECRA 50-year warranty) Stone-coated steel's galvanized steel core resists corrosion, and the stone chip surface resists UV degradation. DECRA warranties are 50 years non-prorated for material and 20 years for workmanship. | 25–30 years (architectural); 30 years (Class 4 IR) |
| Weight | ~125–150 lbs/square Counter-intuitively, stone-coated steel is lighter than architectural asphalt because steel is thinner per unit area than multiple asphalt layers. No structural reinforcement needed on standard St. Louis framing. | ~250–350 lbs/square (architectural) |
| Visual Character | Shingle, shake, or tile profiles available; stone-chip texture Asphalt's color range is broader. Stone-coated steel's texture is distinctive — it reads as slightly different from standard asphalt up close. Some homeowners prefer it; others want exact asphalt match. | Full range of standard asphalt profiles and colors |
Choose DECRA / Westlake Royal if...
Choose stone-coated steel if you want Class 4 durability and 50-year lifespan with a traditional roofing appearance, are in an HOA that restricts exposed metal panel, or are optimizing for claim avoidance over a 30+ year ownership horizon.
Choose Architectural Asphalt if...
Choose architectural asphalt (Class 4 version) if upfront cost is the binding constraint, if you're on a 15–20 year ownership timeline, or if you want the broadest color and style selection.
What Stone-Coated Steel Actually Is
Stone-coated steel is galvanized or Galvalume steel coated with an acrylic base and embedded stone chips, then sealed with a clear acrylic overglaze. The result is a panel that has the visual weight and texture of heavy architectural shingles, wood shake, or tile — depending on profile — but the structural properties of a steel substrate.
DECRA is the legacy brand in the category, having invented stone-coated steel roofing in New Zealand in the 1950s. Westlake Royal (formerly Gerard) is the other major manufacturer. Both produce profiles mimicking shingles (DECRA Shingle XD), shake (DECRA Shake XD), and tile (DECRA Tile) and are available through St. Louis roofing distributors.
The material weighs 125–150 lbs per square — lighter than asphalt, far lighter than natural slate — which makes it an interesting option for re-roofing older homes where structural loading is a concern. In some cases, stone-coated steel can install over existing asphalt with furring strips, eliminating tear-off cost.
The Insurance Case for Stone-Coated Steel
Every stone-coated steel product from DECRA and Westlake Royal carries UL 2218 Class 4 impact certification. This is the baseline product, not an upgrade tier, which means any stone-coated steel installation qualifies for the MO/IL insurance premium discount without specifying a particular product version.
The discount math is the same as other Class 4 materials: 20–30% reduction on the wind/hail portion of your homeowner policy. On a typical St. Louis policy, that's $360–$540/year. Over 50 years (the product's warranty period), that's $18,000–$27,000 in today's dollars — meaningful against a $35,000–$55,000 installation.
Stone-coated steel also has a strong track record in actual storm events. DECRA's track record in Texas and Oklahoma — the most aggressive hail markets in the country — shows substantially lower claim frequency than asphalt roofs in the same ZIP codes. For homeowners with hail claim history who are at risk of policy non-renewal, the reduced-claim profile of stone-coated steel can be as valuable as the premium discount.
When Stone-Coated Steel Is the Right Choice
Stone-coated steel fills a specific niche: homeowners who want metal durability and Class 4 performance but don't want the exposed-panel look of standing seam, and whose budget can't stretch to synthetic slate. The product looks more like traditional roofing material than standing seam while outlasting asphalt by 20–30 years.
It's also well-suited for HOA-governed communities where standing seam metal may not be approved but stone-coated steel with a shingle profile can pass architectural review. Most HOAs in St. Louis neighborhoods have language about 'traditional roofing materials' that stone-coated steel satisfies in ways that exposed metal panel does not.
Where we don't recommend it: when Class 4 asphalt is cost-adequate for the homeowner's timeline. If you're staying 15–20 years and Class 4 asphalt saves you $10,000–$20,000 upfront with comparable insurance savings, the math favors asphalt. Stone-coated steel's premium makes sense for 30+ year ownership horizons or situations where durability and claim avoidance have high value.
St. Louis Context
St. Louis's combination of frequent hail events and active insurance market makes Class 4 performance a strong investment argument. Stone-coated steel's inherent Class 4 baseline and strong track record in hail-intensive markets to the south (Oklahoma, Texas) makes it a compelling option for STL homeowners who've been through multiple hail claims on asphalt roofs.
Frequently Asked Questions
Does stone-coated steel look like metal on the roof?+
Not in the shingle or shake profile. DECRA Shingle XD and Shake XD are visually very close to heavy architectural asphalt shingles from street level. The stone chip texture reads as dimensional and traditional, not as flat metal panel. The tile profile (DECRA Tile) looks like Mediterranean barrel tile. Standing seam metal looks like metal; stone-coated steel generally doesn't.
Can stone-coated steel be installed over existing asphalt?+
Sometimes. DECRA and Westlake Royal both publish over-roofing installation specs using wood or metal furring strips. This avoids tear-off cost ($1–$2.50/sqft) but prevents inspection of the underlying deck. Missouri code typically allows one re-roof layer. We generally recommend tear-off on roofs over 20 years old or any roof with known decking issues.
How does DECRA compare to Westlake Royal (Gerard)?+
Both are high-quality stone-coated steel manufacturers with 50-year warranties. DECRA has broader product profile availability and slightly deeper local installer certification in St. Louis. Westlake Royal's steel is often slightly thicker gauge in the base product. Either is a defensible choice — the deciding factor is usually which manufacturer your installer is certified with.
Is stone-coated steel noisier than asphalt in rain?+
Not meaningfully. Stone-coated steel installs over solid wood decking with underlayment, which provides essentially the same acoustic isolation as asphalt on the same deck. The stone chip surface also dampens impact sound. Field reports consistently show no perceptible difference in interior rain noise vs. asphalt on the same building.
How does the 50-year total cost compare to two asphalt replacements?+
Stone-coated steel at $14–$22/sqft installed totals $35,000–$55,000 on a 25-square roof. Two asphalt replacements over 50 years (at today's prices, before future inflation) total $35,000–$52,500. The cost-of-ownership comparison is near-parity — stone-coated steel wins when insurance savings and claim avoidance are added to the analysis.