Finger-joints are used to join short pieces of wood together to form pieces of greater length. The joint is composed of several meshing wedges or “fingers” of wood in two adjacent pieces and is held together with structural adhesives. Finger-joined lumber is used for both structural and non-structural products.Finger joints are just as strong as the longer strips of wood. And in terms of joints, finger joints are as strong as—in some cases stronger than—the fabled mortise and tenon after you apply adhesives.
Each of the fingers has three joints: metacarpophalangeal joint (MCP) – the joint at the base of the finger. proximal interphalangeal joint (PIP) – the joint in the middle of the finger. distal interphalangeal joint (DIP) – the joint closest to the fingertip. The two most important advantages of finger jointed lumber are straightness and dimensional stability. With short lengths of wood joined into longer pieces, the warping and twisting associated with regular dimension lumber is minimized
