Black Locust is one of the most durable hardwoods in North America, known for its exceptional natural resistance to rot, decay, and insect damage. Unlike pressure-treated lumber, this performance comes entirely from the wood itself—no chemical treatments required. With a Class 1 durability rating, Black Locust is in the highest category for decay resistance, making it an ideal choice for exterior applications where long-term performance is critical.

In addition to its durability, Black Locust offers outstanding fire performance. The material achieves a Class A fire rating, the highest level available for building materials, providing an added layer of safety in both residential and commercial environments. This combination of fire resistance and structural hardness makes it a trusted solution for demanding applications such as decking, siding, boardwalks, and public-use spaces.

As a domestic hardwood species, Black Locust presents a compelling alternative to tropical imports like Ipe and Teak. It is sustainably sourced within North America, reducing environmental impact while supporting local forestry and manufacturing. With a lifespan exceeding 50 years in exterior conditions, Black Locust delivers long-term value through durability, minimal maintenance, and a completely chemical-free composition that naturally weathers to a beautiful silver-gray patina over time.

Traditional Lap Siding (Clapboard)

Our traditional lap siding delivers a timeless, architectural look with proven performance. The overlapping profile naturally sheds water, creating a durable, weather-resistant façade suited for both residential and commercial applications. In Black Locust, this classic system gains a new level of longevity without the need for chemical treatment.

Nickel Gap / V-Groove Siding

For a more refined, contemporary finish, nickel gap and V-groove profiles offer clean lines with subtle shadow reveals. These profiles are widely used in both exterior cladding and interior applications, giving designers flexibility to create modern or transitional aesthetics with consistent spacing and visual depth.

Tongue & Groove Siding

Tongue and groove siding provides a tight, seamless fit with excellent dimensional stability. Ideal for vertical or horizontal applications, this profile is often specified for rainscreen systems, soffits, and feature walls where a clean, continuous wood surface is desired.

Custom Milled Profiles — Built to Your Design

At Black Locust Lumber, we go beyond standard profiles. With our in-house molder and knife-making capabilities, we can produce fully custom siding profiles based on your drawings or specifications.Whether you're matching an existing detail, developing a proprietary system, or designing something entirely new, our team can:

Manufacture custom knife profiles

Run bespoke siding dimensions and shapes

Support architectural details and one-off designs

Maintain consistency across large production runs

If you can draw it, we can run it.

‍A Domestic, Responsible Choice

‍All of our Black Locust is sourced from the Appalachian region of the United States, working directly with local landowners and forestry networks. This regional supply chain reduces transportation impact while supporting responsible land management practices. Black Locust is a naturally regenerative species, making it a reliable, renewable resource for long-term exterior applications.

‍Built on Local Craft & Forestry Practices

‍We partner closely with local sawmills, craftsmen, and the Amish community throughout Pennsylvania to produce our material. This hands-on, regional approach allows us to maintain quality while supporting rural economies and traditional woodworking expertise. Every piece is processed with a focus on efficiency, minimizing waste and maximizing the value of each log.

‍A Smarter Alternative to Tropical & Modified Materials

‍Black Locust offers a high-performance, domestic alternative to tropical hardwoods and heavily modified wood products. Instead of relying on imported species shipped across the globe—or energy-intensive processes like thermal modification or synthetic composites—Black Locust delivers natural durability, strength, and longevity straight from the source. Choosing Black Locust supports a more localized, lower-impact supply chain while delivering the long-term performance expected from premium exterior materials, without the need for chemical treatments or intensive processing.