HardiePlank lap siding is one of the most popular choices for homeowners looking to protect their investment with a durable, attractive exterior. Made from fiber cement, this material offers the classic look of traditional wood siding without the susceptibility to rot, pests, and fire. Whether you are building a new home or upgrading your current exterior, understanding the specifications and installation requirements of this material is essential for a long-lasting result.
This guide provides a comprehensive overview of HardiePlank siding. We will cover the technical specifications, the variety of colors available, and the basic steps for a successful installation to help you make an informed decision for your home improvement project.
Understanding Fiber Cement Composition
HardiePlank is composed of fiber cement, a mixture of cellulose fibers, sand, and cement. This unique blend creates a heavy, masonry-like material that is exceptionally stable and resistant to the elements. Unlike vinyl, it does not crack in extreme cold or melt in extreme heat.
The manufacturing process allows the boards to mimic the texture of natural wood grain. This provides a high-end aesthetic that enhances curb appeal while maintaining the structural integrity of a man-made product. It is specifically engineered to withstand various climates, often categorized by regional zones to ensure the best performance for your local weather patterns.
Key Specifications and Dimensions
HardiePlank comes in several sizes and textures to suit different architectural styles. Knowing these dimensions helps in calculating the amount of material needed for your project and ensures you achieve the desired visual effect.
Standard Board Sizes
Most HardiePlank lap siding boards are 12 feet long. The thickness is typically 5/16 of an inch. The width of the boards varies, which determines the “exposure” or the amount of the board visible once installed.
- Widths: Available in 5.25, 6.25, 7.25, 8.25, 9.25, and 12-inch options.
- Exposures: The visible portion ranges from 4 inches to 10.75 inches, depending on the board width and the required 1.25-inch overlap.
- Weight: Fiber cement is heavy, weighing approximately 2.3 pounds per square foot. This requires sturdy framing and careful handling during installation.
Texture Options
You can choose from different textures to match your home’s design. The Select Cedarmill texture mimics the look of natural cedar wood with a deep grain. The Smooth texture provides a modern, clean look often found in contemporary architecture. There are also beaded options that add a decorative edge to each lap.
Exploring Color and Finish Options
One of the biggest advantages of HardiePlank is the variety of finishing options. You can choose to have the boards arrive pre-finished or primed for painting on-site. The factory-applied finish, often referred to as ColorPlus Technology, is baked onto the boards for maximum durability.
The ColorPlus Technology
This process involves applying multiple coats of finish in a controlled factory environment. This results in a consistent color that is highly resistant to UV fading, chipping, and peeling. These colors are often grouped into collections:
- Statement Collection: Features the most popular colors in your local region, ensuring they are readily available and match local trends.
- Dream Collection: Offers over 700 customized color options, allowing for complete creative freedom for your home’s exterior.
Primed for On-Site Painting
If you have a very specific custom color in mind that is not available in the factory finishes, you can purchase boards that are pre-primed. This allows you to apply high-quality acrylic latex paint after the siding is installed. While this requires more labor, it provides the flexibility to match any color palette exactly.
Preparation and Safety for Installation
Before beginning the installation, it is crucial to prepare the workspace and gather the correct tools. Working with fiber cement requires specific safety precautions that differ from wood or vinyl siding.
Safety First
Cutting fiber cement produces silica dust, which can be harmful if inhaled. Always wear a properly fitted N95 respirator mask when cutting the boards. Whenever possible, use specialized shears that cut the material without producing dust, or use a circular saw equipped with a vacuum attachment and a polycrystalline diamond-tipped blade.
Required Tools
To install HardiePlank correctly, you will need a few specialized tools alongside standard carpentry equipment. These include a pneumatic siding nailer, stainless steel or hot-dipped galvanized nails, a level, a chalk line, and a speed square. You may also want to use siding gauges, which hold the boards in place at the correct exposure while you nail them down.
Step-by-Step Installation Guide
Proper installation is the key to maintaining the manufacturer’s warranty and ensuring the siding protects your home from moisture. Follow these general steps for a standard lap siding installation.
1. Prepare the Wall Surface
The siding must be installed over a weather-resistive barrier (WRB), such as a house wrap. Ensure the wrap is properly taped and flashed around windows and doors. Install a starter strip at the bottom of the wall to provide the correct angle for the first course of siding.
2. Establish the First Course
Use a chalk line to ensure the first row of siding is perfectly level. The bottom edge of the siding should hang at least 1/4 inch below the starter strip. Maintain a clearance of at least 6 inches between the bottom edge of the siding and the ground or any soft landscaping.
3. Nailing Techniques
HardiePlank can be installed using either “blind nailing” or “face nailing.” Blind nailing is the preferred method for aesthetic reasons. The nail is driven through the top of the board, about 1 inch from the top edge. The subsequent row of siding then covers the nails of the row below it.
- Nails should be spaced no more than 16 inches apart.
- Ensure nails are driven straight and flush with the surface; do not over-drive them, as this can crack the board.
- Nails must penetrate at least 1 inch into the structural framing (studs).
4. Managing Gaps and Joins
Where two boards meet end-to-end, this is called a butt joint. These joints should be made in moderate contact, meaning the boards touch but are not forced together. It is highly recommended to place a piece of joint flashing (a small strip of metal or durable plastic) behind every butt joint to direct water away from the wall cavity.
5. Flashing and Clearances
Maintain a 1/8-inch gap between the siding and any trim pieces, such as window casing or corner boards. This gap should be filled with a high-quality, permanently flexible caulk. Ensure there is a 2-inch clearance where the siding meets a roofline to prevent moisture wicking.
Maintenance Tips for Longevity
HardiePlank is low-maintenance, but it is not “no-maintenance.” A few simple tasks performed once or twice a year will keep the siding looking new and performing well for decades.
Regularly inspect the caulking around windows, doors, and corners. If you notice cracking or shrinking, remove the old caulk and apply a fresh bead. Wash the siding annually using a garden hose and a soft brush to remove dirt and debris. Avoid using pressure washers, as the high pressure can damage the surface of the boards or force water behind the siding.
Conclusion
HardiePlank siding is a premier choice for those seeking a balance of beauty and resilience. By choosing the right specifications and following professional installation standards, you can ensure your home remains protected and stylish for years to come. If you found this guide helpful, consider exploring our other articles on home exterior maintenance and renovation tips to keep your property in top condition.