Choosing the right siding for a home or building project involves more than just color and material. Understanding the terminology can help homeowners and contractors alike make informed decisions that result in a more durable, attractive, and well-installed exterior. With our preferred vendor James Hardie, a leader in fiber cement siding, many of these terms come to life in high-performance products built to withstand harsh weather while delivering timeless curb appeal.
Below is a primer on key siding terminology that contractors and homeowners should know, especially when working with premium products like James Hardie siding, available at Dunn Lumber.
Backer Board. Backer board is a flat, supportive material installed behind siding—especially around seams or vulnerable areas—to provide extra strength and prevent moisture intrusion. It’s often used in fiber cement siding installations to ensure a flush surface and additional durability. James Hardie recommends compatible backer materials for long-lasting performance.
Butt Joint. Where two pieces of siding meet end to end. In James Hardie siding installations, butt joints should be staggered and properly sealed to prevent moisture intrusion.
Caulk. Flexible material used to seal gaps in siding and trim. It is essential for protecting the home from air and water infiltration, especially where siding meets trim or penetrations.
Fiber Cement Siding. A durable material made from a mix of cement, sand, and cellulose fibers.
James Hardie pioneered this category, offering siding that resists moisture, fire, pests, and rot, while mimicking the look of wood.
Flashing. Thin strips of metal or waterproof material used to prevent water penetration at siding joints, around windows, and where siding meets roofing or foundations. Proper flashing installation is key to siding longevity.
Furring Strips. Furring strips are narrow strips of wood or metal fastened to a wall to create a level surface for siding. These strips can help with water drainage, ventilation, and even insulation. They’re especially important when installing James Hardie siding over uneven or masonry surfaces.
Lap Siding. Sometimes called clapboard or horizontal siding, lap siding involves boards installed with each board overlapping the one below. James Hardie’s HardiePlank® Lap Siding is one of the most popular products in North America.
Panel Siding. Often used for modern or contemporary homes, panel siding features large boards that create clean lines and flat surfaces. James Hardie’s HardiePanel® products are engineered to pair with HardieTrim® boards for visual balance.
Plank Siding. Plank siding, also known as lap siding, consists of long, horizontal boards that overlap each other. James Hardie’s most popular product—HardiePlank® lap siding—is a prime example. It offers the timeless look of wood with the added benefit of resistance to pests, rot, and weather.
Rainscreen System. A rainscreen system is an installation technique that includes an air gap between the siding and the weather-resistant barrier on the wall. This gap allows moisture to drain and air to circulate, helping to prevent rot and mold. James Hardie products are compatible with rainscreen installation methods in high-moisture environments.
Shingle Siding. Designed to emulate cedar shingles, this style delivers a classic, textured look. James Hardie offers HardieShingle® siding for gable ends and entire facades alike.
Soffit. The underside of the roof overhang, the soffit allows air circulation into the attic and can also be vented. James Hardie manufactures pre-cut soffit panels to match siding styles.
Trim. Trim boards frame windows, doors, corners, and other edges to complete the exterior design. James Hardie’s HardieTrim® offers both style and protection, designed to work with all siding styles.
Vertical Siding. Also known as board-and-batten, vertical siding creates a unique appearance using wide boards with narrow strips (battens) that cover the seams. This is a popular style for farmhouse or modern exteriors.
Why Siding Terminology Matters
Understanding these terms makes communication between contractors and homeowners easier. For contractors, using the right terminology boosts credibility and shows professionalism. For homeowners, it means making informed choices about materials, appearance, and long-term value.
Working with James Hardie on Your Next Siding Project
We proudly offer James Hardie siding as part of our commitment to providing contractors and homeowners with trusted, high-performance building materials. James Hardie products are designed specifically to handle the temperature extremes, moisture, and seasonal changes of the Midwest.
Contractors choose James Hardie for its durability, aesthetics, and ease of installation. Homeowners appreciate the low maintenance and lasting curb appeal. When paired with expert support and delivery, siding projects stay on schedule and on budget.
Need Help? We Speak Your Language
Whether you’re a homeowner learning the ropes or a contractor guiding clients through siding decisions, understanding the language of siding makes the entire process smoother. And with us and James Hardie on your side, you’re backed by decades of industry knowledge and support.
Stop by or connect with a sales representative to explore the full line of James Hardie products and make your next siding project a success.
