fingerjointed

Fingerjointed, or finger-jointed, describes a method of joining wood by cutting a pattern of rectangular projections, or fingers, into the ends of adjacent pieces. When interlocked and glued, the fingers form a continuous length that can be as strong as a solid board of the same species and thickness.

Manufacture begins with planed boards whose ends are milled to create the finger pattern. The pieces are coated with a wood adhesive, aligned, and clamped under pressure until the glue cures. The joints increase surface area for bonding and help resist end-grain splitting.

Applications include long stock created from shorter boards, such as trim, moldings, picture frames, and door or window components, as well as various lower-cost furniture. Finger-jointed lumber is widely used in cabinetry and construction where long, stable pieces are needed but high-grade solid stock is unavailable or costly. It is also used in some engineered wood products and in situations that prioritize efficient use of material.

Advantages include reduced waste by utilizing scrap or lower-grade lumber, improved dimensional stability, and the possibility of automation in production. Limitations involve moisture sensitivity of the adhesive joint, potential environmental concerns with some glues, and the need for controlled manufacturing conditions to ensure joint quality, especially in exterior or high-humidity applications. Overall, fingerjointed products offer a balance between material efficiency and structural performance for many woodworking and construction needs.