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Tongue
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Tongue
 

Information About

Tongue And Groove




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. Such a joint should not be glued as shrinkage would pull the tongue off.
The tongue and groove could be cut in a number of ways.

For most uses, tongue and groove boards were rendered obsolete by the introduction of Plywood and later Composite Wood boards but it is still used in good-quality flooring and plywood can be tongued all round to fit it flush into a framed structure.