James Hardie 5/16 in. x 8-1/4 in. x 12 ft. HardiePlank Smooth Lap Siding, HZ10, Cobble Stone

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HardiePlank Smooth Lap Siding, 8-1/4 in. x 12 ft., HZ10

Durable fiber cement lap siding engineered for HardieZone 10 climates. The Smooth finish delivers a clean, modern look in Cobble Stone and arrives factory primed for paint or available with ColorPlus Technology. Built to resist moisture, rot, pests, and fire with long-lasting performance.

Key Features:

  • Engineered for Climate (HZ10): Optimized to withstand heat, humidity, and coastal conditions
  • Smooth Modern Profile: Clean, timeless lap appearance for versatile curb appeal
  • Fiber Cement Durability: Resists moisture, swelling, cracking, rot, and pests
  • Factory Primed: Ready to paint on-site or choose ColorPlus Technology finishes
  • Long-Term Assurance: Backed by a 30-year limited, non-prorated warranty

Please check the Product Data Sheet Here

Specifications Table:

Specification Details
Material Fiber Cement
Finish Smooth; Factory Primed (Cobble Stone)
HardieZone HZ10
Board Dimensions 5/16 in. T x 8-1/4 in. W x 12 ft. L
Coverage Area 8.25 sq. ft. per board (nominal)
Color Family Gray
Profiles Lap (Panel listing on source page)
Orientation Vertical / Horizontal
Product Weight 19.8 lb
Product Thickness 0.31 in
Manufacturer Warranty 30-Year Limited, Non-Prorated
Features Resists moisture, swelling, cracking, pests; fire resistant

Frequently Asked Questions (FAQ):

Q: What are the board dimensions?
A: Each board measures 5/16 in. thick, 8-1/4 in. wide, and 12 ft. long.

Q: How much coverage does one board provide?
A: Approximately 8.25 sq. ft. per board before accounting for overlap.

Q: Is this product prefinished?
A: It is factory primed; ColorPlus Technology prefinished options are also available.

Q: Can it be installed horizontally and vertically?
A: Yes, it can be installed in horizontal or vertical applications following James Hardie guidelines.

Q: What is the warranty?
A: 30-year limited, non-prorated manufacturer warranty.

A Sleek, Architectural Skin for Your Home

This smooth lap siding washes your facade in a refined, tailored line that feels both classic and crisp. I love how the flat, satin plane catches light softly, creating a quiet rhythm across elevations. Pair it with sharp white trim and matte black accents for a gallery-clean exterior, or warm wood doors to soften the geometry. It’s an essential foundation for a luxurious, enduring curb appeal.

Upgrade your exterior with HardiePlank Smooth—engineered durability and refined style that lasts for decades.

Warranty

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