Allura’s Shake Select panels pack 5/16” of fiber cement thickness — a full 1/16” thicker than standard shake siding. That extra thickness delivers enhanced rigidity and shadow lines that make a measurable difference in both appearance and durability. For contractors building in Montana’s wildfire-prone zones, the CalFire WUI certification (8170-2180:0501 & 0502) makes this product worth serious consideration.
These staggered-edge panels measure 16” × 48” with a 7” exposure, weighing between 13.1 and 16 pounds per panel at approximately 85 lb/ft³ density. The fiber cement composition earns a Class A fire rating with zero flame spread and minimal smoke development (ASTM E84: Flame Spread 0, Smoke Developed 5).
Fire Performance and Weather Resistance
The non-combustible rating comes backed by serious testing — ASTM E136 non-combustibility certification and ASTM E84 surface burning characteristics that show zero flame spread. That’s not marketing fluff. In high-risk fire zones and Wildland-Urban Interface areas, these panels provide genuine protection.
Beyond fire resistance, the panels handle Montana’s freeze-thaw cycles without the swelling, rotting, or buckling that plagues lesser materials. Factory-applied UV-stable coatings protect against color fade at elevation, while the moisture-resistant fiber cement core prevents the warping and cracking that destroy wood siding after a few brutal winters.
| Specification | Value | Source |
|---|---|---|
| Fire Rating | Class A (Non-combustible) | ASTM E136 |
| Flame Spread | 0 | ASTM E84 |
| Smoke Developed | 5 | ASTM E84 |
| Thickness | 5/16 inch | Manufacturer |
| Panel Size | 16” × 48” | Manufacturer |
| Exposure | 7 inches | Manufacturer |
| Weight | 13.1-16 lbs per panel | Manufacturer |
| Density | 85 lb/ft³ | Manufacturer |
Installation Requirements and Warranty Coverage
Installation demands corrosion-resistant siding nails spaced 12” on center at studs, with the 7-inch exposure maintained as panels overlap from bottom to top. Cutting requires carbide-tipped saw blades or fiber cement shears — standard wood blades won’t cut it. Critical clearances include 6” from soil and 2” from hard surfaces like roofing or decking.
The panels’ weight requires careful handling to prevent breakage, and you’ll need those specialized cutting tools. But contractors who’ve worked with fiber cement know the drill — proper dust collection or respirators during cutting, sealing all cut edges with quality caulk.
The 30-year limited transferable product warranty backs the panels themselves, while factory-applied coatings carry either 15-year or 30-year limited warranties depending on the finish system (Allura Spectrum/Sherwin-Williams). Warranty coverage requires installation per manufacturer’s guidelines — no shortcuts on fastening or clearances.
Compared to James Hardie’s standard 1/4” shingle products, Allura’s 5/16” thickness provides that extra rigidity. Both offer 30-year warranties, but Allura’s staggered edge creates deeper shadow lines and more realistic grain texture. Against natural cedar, the advantages multiply — no rot, no insect damage, non-combustible versus highly flammable wood, and zero need for periodic staining or sealing.
The Bottom Line
Professional installers praise the consistent quality and thicker feel compared to competitors, calling it good value in pre-finished options with realistic wood appearance from a distance. The thicker profile matters in Montana — better wind resistance, enhanced shadow lines that show up even in flat light, and genuine rigidity that thinner products can’t match.
For Montana contractors dealing with wildfire interface zones, freeze-thaw cycling, and clients who want the cedar look without cedar maintenance, these panels deliver. The CalFire WUI listing isn’t just paperwork — it’s validation that this product belongs on homes where fire resistance actually matters. At 5/16” thick with proper installation, these panels will outlast the mortgage.
Frequently Asked Questions
Q: How does the 5/16” thickness compare to standard fiber cement shakes? Allura Shake Select runs 5/16” thick versus the typical 1/4” thickness of products like James Hardie Shingle panels. That extra 1/16” provides enhanced rigidity and creates deeper shadow lines for a more realistic appearance.
Q: What makes this suitable for Montana’s wildfire zones? The panels carry Class A fire rating with ASTM E136 non-combustibility certification and ASTM E84 ratings showing zero flame spread. They’re specifically listed for CalFire Wildland-Urban Interface areas (8170-2180:0501 & 0502).
Q: What special tools are required for installation? Installation requires carbide-tipped saw blades or fiber cement shears for cutting, with dust collection equipment or respirators per OSHA guidelines. Corrosion-resistant siding nails (hot-dip galvanized or stainless) are mandatory.
Q: How long does the warranty coverage last? The product carries a 30-year limited transferable warranty. Factory-applied coatings have either 15-year or 30-year limited warranties depending on whether you choose Allura Spectrum or Sherwin-Williams finish systems.
Q: Can these panels handle Montana’s freeze-thaw cycles? Yes — the panels are specifically engineered to resist freeze-thaw cycles without swelling, rotting, or buckling. The fiber cement composition maintains stability through temperature extremes.
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