James Hardie Hardieplank 5-1/4"x12' Smooth Primed Lap Siding

Product Overview
Achieve a clean, modern, and minimalist exterior aesthetic with the James Hardie HardiePlank 5-1/4" x 12' Smooth Primed Lap Siding Board. Sourced through Boise Cascade, this premium fiber cement siding panel provides a perfectly flat, smooth surface face that delivers a sleek contemporary look without the textured markings of traditional wood boards. Engineered with a high-performance blend of cellulose fiber and Portland cement, HardiePlank offers an exceptional level of structural defense against the elements that traditional wood and vinyl siding simply cannot match.

Engineered for Extreme Northern Climates
James Hardie siding is specifically formulated for regional weather conditions. It boasts exceptional dimensional stability, ensuring it will never swell, shrink, wrap, or split when exposed to heavy freeze-thaw cycles and hot summer humidity. It is entirely non-combustible and fire-resistant, providing an outstanding safety rating for residential properties. Furthermore, fiber cement completely eliminates vulnerabilities to wood rot, fungal decay, hail impacts, and wood-boring pests or rodents. Each 12-foot board arrives factory pre-primed, creating a smooth surface that ensures superior topcoat paint adhesion.

Product Specifications

• Dimensions: 5-1/4 in. Panel Width x 12 ft. Panel Length x 5/16 in. Thickness
• Texture Profile: Smooth (Clean, flat modern exterior texture)
• Material Core: Premium Engineered Fiber Cement (Portland cement, sand, and cellulose fibers)
• Fire Safety Rating: Non-Combustible (Approved for strict fire-rated exterior assemblies)
• Finish: Factory Primed on all sides (Ready for high-quality exterior paint finishes)
• Application: Residential Lap Siding, Contemporary Home Cladding, and Architectural Remodels
• Brand Source: Boise Cascade-LBM / James Hardie Building Products
• SKU: JH5SPR
• UPC: 0400858

Key Framing & Field Installation Requirements

• Mandatory Field-Cut Sealing: To protect the core and preserve the James Hardie manufacturer warranty, any on-site field cuts must be coated immediately using an approved exterior acrylic latex primer or color-matched edge sealer.
• Joint Flashing Clearance: Install panels with a 1/4-inch clearance gap at all trim transitions and window casings, ensuring gaps are filled with a high-quality polyurethane exterior sealant. Use joint flashing sheets behind butt-joints for complete water management.

Frequently Asked Questions

• What is the actual exposed reveal width of a 5-1/4" siding board? HardiePlank requires a standard 1-1/4 inch overlap along the top edge of each course. This leaves an actual exposed face reveal of exactly 4 inches to the weather. Keep this 4-inch reveal in mind when calculating how many boards are required to cover your home's total wall square footage.
• How long can factory-primed HardiePlank sit before it must be painted? The premium factory primer shields the fiber cement core during construction. However, for optimal paint performance and protection, apply a high-quality 100% acrylic latex exterior paint topcoat over the siding within 180 days of installation on the house framework.
• What specific tools and fasteners are required to cut and install fiber cement? To cut HardiePlank cleanly and limit dust, use a circular saw equipped with a specialized polycrystalline diamond-tipped fiber cement blade or heavy-duty hand snips. Fasten the siding securely using corrosion-resistant hot-dip galvanized or stainless steel siding nails driven through the pre-marked blind nailing track at the top of each board.

Available for yard pickup or flatbed jobsite trailer delivery from Rice Lumber Company in Shelburne, VT.