How to Install Hardie Board Siding Yourself

Understanding Hardie Board Siding Materials and Types

Hardie Board, officially called fiber cement board, is a building material made from cement, wood fibers, and other components pressed together under high pressure. James Hardie, an Australian company, pioneered this product in the 1980s, and it has become one of the most popular siding options in North America. Unlike traditional wood siding, which can rot or warp, fiber cement resists moisture, pests, and weathering.

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The material comes in several forms. Lap siding, the most common type, features overlapping horizontal boards that shed water downward, similar to traditional clapboard. Board-and-batten style has vertical boards with narrow strips (battens) covering the seams. Shingle-style Hardie Board mimics the appearance of wood shingles and works well on gables or accent walls. Smooth finish boards provide a clean, modern look, while textured finishes can resemble wood grain or other patterns.

Hardie Board is approximately three-eighths of an inch thick and typically comes in 12-foot lengths, though shorter lengths are available for specific applications. Standard widths range from 5.25 to 12 inches. The material weighs roughly 2.5 pounds per square foot, making it heavier than vinyl but lighter than brick. A typical house requiring 2,000 square feet of siding might need 50 to 65 boards, depending on board width and waste allowance.

Color options have expanded significantly. Hardie manufactures prefinished boards in dozens of colors, from classic whites and grays to earth tones and bold hues. Alternatively, installers can paint Hardie Board on-site using exterior-grade paint formulated for fiber cement. Prefinished boards come with a 15-year paint warranty in most regions, while field-painted boards typically carry a shorter warranty period.

Practical takeaway: Before purchasing materials, measure your house carefully by dividing total square footage of walls by the board width you select, then add 10-15% extra for waste, cuts, and future repairs. Visit a supplier to see color samples in natural light, as monitor displays can misrepresent actual hues.

Tools and Equipment You'll Need

Installing Hardie Board requires specific tools because the material is harder and denser than wood. Unlike standard wood siding installation, which relies primarily on hand tools, fiber cement demands power tools for efficient cutting. The most critical tool is a fiber cement shear or circular saw equipped with a carbide-tipped blade rated for masonry or fiber cement. A standard wood blade will dull quickly and produce rough, dangerous edges.

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A power miter saw with a fiber cement blade allows you to make precise 45-degree angle cuts for corners and trim work. A table saw with a fine-toothed blade works for lengthwise cuts, though many installers prefer handheld saws for portability. A jigsaw with a carbide blade handles curved cuts around windows and architectural details. For larger jobs, some professionals rent a specialized fiber cement cutting station that produces less dust and cleaner cuts than handheld methods.

Beyond cutting equipment, you'll need standard carpentry tools: a 24-inch or 32-inch level to ensure boards are perfectly horizontal, a tape measure, a stud finder to locate wall framing, a pneumatic nailer or cordless drill-driver, and a hammer for driving fasteners. A circular saw or reciprocating saw helps remove old siding. Caulking guns and putty knives apply sealant and trim adhesive around windows and doors.

Safety equipment is not optional. Fiber cement produces fine silica dust when cut, which can cause serious respiratory damage. A NIOSH-rated N95 or P100 respirator mask is essential. Safety glasses protect against dust and flying debris. Work gloves reduce splinters and sharp edge contact. Hearing protection is recommended when operating power tools for extended periods. A dust collection system attached to your saw significantly reduces airborne particles and improves visibility while cutting.

A work platform or scaffolding system helps you reach upper wall areas safely. For single-story homes, a sturdy ladder against wall bracing works adequately. For two-story installation, renting a mobile scaffold or pump jack system prevents falls and reduces fatigue. A nail gun air compressor, if you're using pneumatic nailers, should deliver 2 to 3 cubic feet per minute at 70 to 100 pounds per square inch.

Practical takeaway: Rent or borrow specialized cutting equipment rather than purchasing it for a one-time project. Most tool rental shops offer fiber cement saws and cutting stations at daily or weekly rates far below purchase prices. Invest in quality dust protection—the long-term health benefits justify the expense.

Preparing Your Walls and Removing Old Siding

Proper wall preparation determines whether your new siding will last 30+ years or fail prematurely. Begin by inspecting the existing wall structure. If your home currently has wood siding, you may install Hardie Board directly over it if the wood is structurally sound and not severely damaged. However, removing old siding allows you to inspect the underlying sheathing, house wrap, and framing for rot, water damage, or pest infiltration.

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To remove lap siding, use a reciprocating saw or pry bar to carefully separate boards from the wall. Start at the top and work downward, removing fasteners systematically. If the house has brick or stucco, removing it requires more effort. Consult a professional if you discover asbestos-containing materials—common in homes built before 1980—as improper removal can release hazardous fibers. In these cases, leave the old siding intact and install new material over it.

Once old siding is removed, inspect the sheathing—typically plywood or oriented strand board (OSB) sheets covering the wall frame. Replace any sections showing rot, sponginess, or extensive water damage. Minor surface irregularities are acceptable; Hardie Board's rigidity allows it to bridge small gaps. If the sheathing is severely uneven or wavy, install furring strips (thin wood strips) over it to create a flat, even surface.

Install house wrap over the sheathing before hanging any siding. House wrap serves three critical functions: it prevents water from penetrating behind the siding, allows interior moisture to escape (breathability), and reduces air infiltration that costs heating and cooling energy. Overlap seams by at least 6 inches and run wrap vertically when possible. Tape all seams and penetrations with specialized house wrap tape. Popular products include Tyvek, Housewrap, and various generic brands—all perform similarly when installed correctly.

Check wall framing spacing before installing Hardie Board. Standard framing occurs at 16-inch or 24-inch intervals. Hardie Board should be fastened directly to studs or blocking. If spacing exceeds 24 inches, install horizontal blocking between studs to support board fasteners. Inspect for level and plumb—walls should not lean or bow. Minor variations under one-quarter inch per 10 feet are acceptable, but larger issues require shimming or additional blocking.

Practical takeaway: Photograph wall conditions before, during, and after removal of old siding. These images document pre-existing damage and help explain any future issues. If uncertain about underlying wall condition, hire a home inspector or experienced contractor to evaluate before proceeding.

Cutting, Fitting, and Fastening Hardie Board

Cutting fiber cement accurately is essential for proper water management and aesthetic appearance. Always wear a respirator when cutting, as silica dust created during the process poses serious health risks. Make all cuts outdoors or in well-ventilated areas. A wet-cutting method—using a circular saw with a special water-fed blade or a fiber cement cutting station—virtually eliminates dust and produces cleaner edges than dry cutting.

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Measure twice, cut once. Use a tape measure and pencil to mark cut locations on the back (unpainted) side of the board. For straight crosscuts, clamp a speed square to the board as a guide, then cut along the edge using a circular saw or miter saw. For angled cuts around roof lines or bay windows, create a template from cardboard or thin plywood, transfer the shape to the Hardie Board, and cut carefully with a jigsaw or reciprocating saw. Cut openings for windows and doors slightly larger than the frame, allowing space for flashing and caulking.