Hardie Board siding is a fiber cement exterior cladding product made by James Hardie. It is used on residential and other building exteriors as an alternative to materials such as traditional wood siding or vinyl.
Homeowners, builders, and designers often consider Hardie siding because fiber cement combines the appearance and design flexibility of siding boards or panels with resistance to several common causes of exterior cladding damage.
North Bay Lumber supplies lumber and building materials for projects in the San Francisco Bay Area, including Hardie Board siding for exterior applications.
Hardie products are available in multiple exterior formats, including horizontal planks, vertical panels, shingle-style siding, and trim components.
What Is Hardie Board Siding?
“Hardie Board” is a commonly used name for fiber cement siding manufactured by James Hardie.
Fiber cement is a composite building material rather than solid wood. It is formed into exterior siding products designed to provide a durable cladding surface while supporting a range of architectural styles.
The phrase can refer broadly to Hardie exterior siding, although individual James Hardie products are designed as planks, panels, shingles, trim, or other specific components.
That distinction matters when ordering material because a project calling for horizontal lap siding requires a different product configuration from one designed around vertical panels and battens.
What Is Hardie Fiber Cement Siding Made From?
James Hardie fiber cement siding contains several basic ingredients:
- Portland cement;
- sand;
- water;
- cellulose fibers;
- proprietary additives used in the formulation.
These ingredients are formed into fiber cement products designed for exterior cladding.
The resulting material is fundamentally different from wood siding. Because fiber cement is not conventional solid wood, it responds differently to fire, pests, moisture, and decay.
Benefits of Hardie Board Siding
Durability
Exterior siding is continuously exposed to sun, rain, temperature changes, and other environmental conditions.
Hardie fiber cement products are engineered specifically as exterior cladding and are designed to resist damage associated with weather and moisture exposure.
Correct product selection and installation remain essential. Durable material does not compensate for incorrect flashing, clearances, fastening, or other construction details.
Noncombustible Fiber Cement
One of the most notable characteristics of Hardie siding is its fire performance.
James Hardie identifies its siding as compliant with ASTM E136 requirements for noncombustible cladding.
“Noncombustible” is more precise than calling siding “fireproof.” A complete wall assembly contains many other components, and paints or finishes can behave differently when exposed to fire.
Still, the noncombustible nature of the fiber cement cladding itself is an important material characteristic.
Moisture Resistance
Wood-based exterior materials can be vulnerable when moisture repeatedly reaches and remains within the material.
Hardie fiber cement siding is engineered to resist moisture-related damage and does not rot in the same way untreated wood siding can.
Proper installation and water management remain necessary because siding is only one component of the complete building envelope.
Resistance to Pests
Fiber cement does not provide the same food source as conventional wood siding for termites and other wood-destroying insects.
That can be useful when the goal is to reduce exterior cladding vulnerabilities associated with natural wood materials.
Types of Hardie Siding
Choosing Hardie Board siding is not just a matter of choosing fiber cement. The format of the siding determines the overall appearance of the exterior.
Hardie Board Siding Planks
Horizontal lap siding is one of the most familiar formats.
Hardie Plank products create the traditional horizontal lines associated with lap siding and can be used on a wide range of residential architectural styles.
When project documents call for Hardie Board siding planks, confirm the required product, profile, finish, and quantity rather than assuming all plank siding is interchangeable.
Vertical Panels
Hardie Panel siding uses larger vertical fiber cement panels.
Vertical panels can create a cleaner contemporary appearance on their own or become the base for a board-and-batten exterior.
Hardie Board and Batten Siding
Hardie Board and batten siding uses vertical panel siding together with narrower batten trim pieces.
James Hardie combines vertical panel siding with batten boards to create the traditional board-and-batten appearance.
The vertical proportions can work on an entire building or as an architectural accent alongside other siding formats.
From a material-ordering standpoint, board-and-batten is therefore not simply one type of wide siding board. It is a system involving the panel surface and separate batten components.
Shingle-Style Siding
Fiber cement can also be formed into shingle-style siding.
This format provides a different visual texture from horizontal lap siding or large vertical panels and may be used across an elevation or as an accent on features such as gables.
Common Applications
Hardie siding is primarily used as exterior cladding.
Common design approaches include:
- horizontal lap siding across the main exterior;
- vertical panel siding;
- board-and-batten elevations;
- shingle-style sections;
- combinations of siding formats to define different architectural areas;
- exterior trim coordinated with the siding system.
The correct combination depends on the design documents and desired exterior appearance.
North Bay Lumber supplies the material rather than installation services. Installation details should follow applicable James Hardie documentation, building requirements, and project specifications.
For projects that also require framing lumber for exterior structures, see our guide to pressure-treated lumber.
Considerations Before Choosing Hardie Board
Know Which Product Format the Project Requires
“Hardie Board” is too broad for a precise material order.
A quote request should identify whether the project requires planks, panels, battens, trim, or another specified siding component.
Installation Requirements Matter
Fiber cement siding performs as part of a complete exterior wall system. Fastening, flashing, clearances, joints, and water management all affect the completed assembly.
Contractors should use the current James Hardie installation instructions for the specified product.
Cutting Fiber Cement Requires Dust Controls
Cutting fiber cement can generate respirable crystalline silica dust.
Appropriate dust-control methods and jobsite safety procedures should be followed when cutting or machining fiber cement products.
Do Not Assume Every Style Is Available in Every Configuration
Hardie products can vary by product line, texture, finish, and regional availability.
If your project documents specify a particular material or appearance, provide those specifications when you Request a Quote rather than substituting based solely on a general “Hardie Board” description.
For more information about lumber, siding, and other building materials, browse the North Bay Lumber Blog.
Frequently Asked Questions
What is Hardie Board siding?
Hardie Board is a common name for fiber cement exterior siding manufactured by James Hardie. The company produces siding in plank, panel, shingle, and related exterior formats.
What is Hardie siding made of?
James Hardie fiber cement siding contains Portland cement, sand, water, cellulose fibers, and proprietary additives.
Is Hardie Board fireproof?
“Fireproof” is not the best description. Hardie siding is classified as noncombustible cladding under applicable testing standards, but the complete wall assembly contains other components and finishes that can respond differently to fire.
Does Hardie Board rot?
Fiber cement does not rot in the same manner as conventional untreated wood siding. Hardie products are engineered to resist moisture-related damage.
Do termites eat Hardie Board?
Fiber cement does not provide the same food source as wood and is resistant to damage from wood-destroying pests.
What is the difference between Hardie Plank and Hardie Panel?
Hardie Plank is a horizontal lap-siding format. Hardie Panel uses larger vertical panels. Panels can also be combined with batten trim to create a board-and-batten design.
How is Hardie Board and batten siding created?
Board-and-batten uses vertical fiber cement panels with narrower batten trim placed over the panel joints or according to the specified design.
Does North Bay Lumber install Hardie siding?
North Bay Lumber is a lumber and building-material supplier. This page concerns material selection and supply rather than siding installation services.
Need Hardie Board Siding in the San Francisco Bay Area?
North Bay Lumber supplies Hardie Board siding and other building materials for projects throughout the San Francisco Bay Area, with delivery available in the region. When requesting material, include the product type shown on your plans, required quantities, and any relevant siding, panel, batten, or trim specifications. Need Hardie Board siding materials for your project?
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