Tongue and groove or T&G is a method of fitting similar objects together, edge to edge, used mainly with wood: flooring, parquetry, panelling, and similar constructions. Tongue and groove joints allow two flat pieces to be joined strongly together to make a single flat surface. Before plywood became common, tongue and groove boards were also used for sheathing buildings and to construct concrete formwork.
Each piece has a slot (the groove) cut all along one edge, and a thin, deep ridge (the tongue) on the opposite edge. The tongue projects a little less than the groove is deep. Two or more pieces thus fit together closely. The joint is not normally glued, as shrinkage would then pull the tongue off.
For many uses, tongue and groove boards have been rendered obsolete by the introduction of plywood and later composite wood boards, but the method is still used in good-quality flooring. Plywood may also be tongued all round to fit it flush into a framed structure, and plywood for sub-floors used in platform framing is often supplied with tongue and groove edges.
When joining thicker materials, several tongue and groove joints may be used one above the other.
Influence of Tongue and Groove System on the Thermal Properties of Large-Format Voided Clay Bricks for Single-Leaf Walls
May 01, 2012; ABSTRACT This paper examines the influence of the type of tongue and groove system used in large-format voided clay bricks on the...
Wipo Publishes Patent of Hwa Hyoung Lee for "Clearance Structure for Absorption in Wall Panels for Tongue-and-Groove Wall Finishing Using a Clearance Adjuster Insert" (South Korean Inventor)
Dec 03, 2012; GENEVA, Dec. 3 -- Publication No. WO/2012/161495 was published on Nov. 29. Title of the invention: "CLEARANCE STRUCTURE FOR...