Tongue and Groove

A joinery method where one board has a protruding ridge (tongue) along its edge that fits into a matching groove (channel) in the adjacent board. Tongue-and-groove construction creates tight, self-aligning joints used in cabinet backs, beadboard panels, and flooring. The interlocking profile adds rigidity, prevents gaps from developing as wood moves seasonally, and provides a clean, finished appearance.

Specifying this for a job? Captivating Pro members buy at 20–40% off retail and get cut sheets before rough-in.