How to Install James Hardie Siding: A Complete DIY Tutorial

Siding Pros
Jun 8
3 min read

Updated: Jun 9

Installing James Hardie siding can transform your home's exterior and provide long-lasting protection against the elements. This durable siding material has become increasingly popular among homeowners who want the look of wood without maintenance headaches. Whether you're considering on hiring a siding contractor in Spokane, WA, or doing it yourself, this tutorial guides you through the complete installation process from start to finish. We'll cover everything, from gathering the necessary tools and preparing your walls to cutting, installing, and maintaining your new siding for years to come.

Getting Started With Tools and Materials

Gather all necessary tools and materials before starting the James Hardie siding installation to ensure a smooth and efficient process. To begin, you will need basic carpentry tools, including a circular saw, tape measure, hammer, utility knife, and chalk line. Specialized tools, such as fiber cement shears, a siding nail gun, and a siding gauge, will be essential for making precise cuts and fastening. It is essential to have safety equipment, such as gloves, goggles, and a dust mask, to protect yourself during the installation process. For materials other than the James Hardie siding itself, you will require flashing, caulk, trim boards, and fasteners, as specified by the manufacturer's guidelines. Having all these tools and materials ready will set the stage for a successful siding installation project.

Preparing Your Exterior Walls

To establish a solid foundation for the installation of James Hardie siding, the exterior walls of your home must undergo thorough preparation.

Inspect the Walls: Check for any damage, decay, or mold that requires repair before proceeding.
Clean the Surface: Remove any dirt, dust, or debris using a pressure washer or a scrub brush with a mixture of water and gentle detergent.
Apply Primer: Coat the walls with a high-quality primer to ensure proper adhesion of the siding and improve durability.
Check for Level: Use a level to ensure the walls are straight and even, correcting any inconsistencies before beginning the installation process.

Cutting and Installing James Hardie Siding

Examining the James Hardie siding for accurate measurements and making precise cuts is important to ensure a seamless installation process. Before cutting, make sure you have the right tools: a circular saw with a carbide-tipped blade or handheld shears for smaller cuts. Measure twice and cut once to avoid errors. When cutting, keep the front side up to prevent chipping. For horizontal cuts, score the board with a utility knife and snap it along the score. Use the JH Hardie Blade saw blade for the best results. Installing the siding involves overlapping joints correctly, leaving a 1/8-inch gap at corners, windows, and doors for expansion. Secure the siding with appropriate nails or screws, following manufacturer guidelines for spacing and placement.

Sealing and Finishing Touches

Make sure a smooth and polished finish by applying sealant along the edges and seams of the James Hardie siding before proceeding with any final touches. To achieve a professional result, follow these key steps:

Sealant Application: Use a high-quality exterior sealant to fill any gaps or joints in the siding.
Seamless Corners: Pay special attention to corners and edges, applying sealant generously for a smooth look.
Color Matching: If touch-ups are needed, make sure the color of the sealant matches the siding for a unified appearance.
Protective Coating: Consider applying a protective coating over the siding to enhance its durability and longevity.

Maintaining Your James Hardie Siding

For proper maintenance of your James Hardie siding, routine upkeep tasks are important to preserving its appearance and structural integrity. To maintain your siding, inspect it annually for any signs of damage, such as cracks, chips, or gaps. Clean your siding at least once a year using a soft brush, mild soap, and water to remove dirt and debris. Check the caulking around windows, doors, and vents to ensure it is intact, and reapply as necessary. Trim any nearby trees or bushes to prevent damage from branches rubbing against the siding. Repaint or touch up any areas where the paint has chipped to maintain the protective coating. By following these maintenance steps, you can extend the lifespan of your James Hardie siding.