What is Tongue and groove?
[[File:Dusheme.jpg|thumb|right|Solid parquet boards with grooves on the near ends. Tongues on the right sides of the boards and grooves on the left sides. The far ends are tongued.]] '''Tongue and groove''' is a method of fitting objects together edge to edge. It is used for 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 wood-covered buildings and to construct concrete formwork (the wooden frames for concrete to be poured into). {{Stub}} [[Category:Woodworking]]