Allura Panel Siding 5/16″ x 4' x 10' Smooth

Allura’s 5/16-inch smooth fiber-cement panels deliver 40 square feet of coverage per sheet with Class A fire resistance and proven freeze-thaw durability. At 98.19 pounds per panel and 2.45 pounds per square foot, these 4×10 panels offer the dimensional stability Montana contractors need without the maintenance headaches of traditional wood siding.

The smooth finish works for contractors who want clean, modern exteriors without grooves or texture patterns. Factory-primed surfaces ensure paint adhesion that actually lasts through Montana’s temperature swings. The 30-year transferable warranty backs the product when installed correctly, though topcoat needs to go on within 180 days of installation.

Specifications and Installation Requirements

The panels measure exactly 5/16 inch (0.3125 inch) thick with a density of 94 pounds per cubic foot. Product number SO628891 identifies this specific panel in the system.

Specification	Value
Dimensions	4’ × 10’ × 5/16”
Coverage per panel	40 sq ft
Weight per panel	98.19 lb
Weight per sq ft	2.45 lb
Pallet quantity	50 panels
Warranty	30 years

Installation demands carbide-tipped saw blades — regular blades won’t cut it through fiber-cement. Fasten panels 6 inches on center at edges using galvanized or stainless steel nails. The substrate needs proper moisture barrier and flashing before the first panel goes up. Install panels level and plumb from the bottom, stagger joints between rows, and seal seams with approved caulk.

Weather Performance and Certifications

The panels carry multiple certifications including CERus-1012, Florida Building Code approvals (FL20742-R6, FL38740-R1), Texas Department of Insurance Report EC-16, and Miami-Dade County acceptance. They’re tested to withstand hurricane-force winds and listed for California’s Wildland-Urban Interface zones.

The material resists moisture, rot, swelling, cracking, and freeze-thaw cycles while maintaining dimensional stability — no warping or splitting. Termites and wood-boring insects can’t touch it. That Class A fire rating matters in Montana’s increasingly fire-prone summers.

Compatible Systems and Applications

These panels work with Allura’s 5/4-inch and 4/4-inch reversible trim boards, SFS TW-S-D12 screws, and standard galvanized ring-shank siding nails. Install over approved sheathing, backerboard, or Allura Backer with standard Z-flashing and step flashing systems.

Applications range from standard residential siding and commercial low-rise facades to overhead accents and sidewalls. The fire rating makes these panels particularly valuable in WUI zones where code demands non-combustible materials.

Builder Jamie Spence calls it “the best product out there” from a longevity standpoint. The combination of industry-leading warranties and proven ROI makes sense for contractors focused on long-term performance.

FAQ

How much does each Allura panel weigh? Each 4×10 panel weighs 98.19 pounds, or about 2.45 pounds per square foot. Factor this weight into jobsite handling and structural calculations.

What’s the actual thickness of these panels? The panels measure 5/16 inch (0.3125 inch) thick. This thickness provides structural integrity while keeping weight manageable.

Can I cut these panels with regular saw blades? No. Use carbide-tipped circular saw blades or fiber-cement shears. Standard blades will dull immediately and create excessive dust.

How long do I have to apply topcoat after installation? Apply topcoat within 180 days of installation for optimal performance and warranty compliance. Montana’s UV exposure makes this deadline critical.

What certifications do these panels carry? Multiple certifications including ICC evaluation report CERus-1012, Florida Building Code approvals, Texas Department of Insurance listing, Miami-Dade acceptance, CalFire WUI listing, and Class A fire rating.