Tongue and Groove
Where is Tongue and Groove used?
Self-Aligning Panel Joint
Commonly used for "beadboard" back panels or integrated wood ceilings. One edge has a protruding "tongue" that fits into the "groove" of the adjacent piece, allowing for natural wood movement without showing gaps.
A classic edge-to-edge joint where a protruding ridge fits into a matching slot, ideal for wainscoting and backs.