Tongue n Groove - For lovers of fine oak tongue n groove, tongue and groove, timber, european oak, timber floors, timber walls, timber stairs, timber ceilings, engineered timber, environmentally friendly timber floors, timber floors syndey, timber floors new south wales, timber floors australia Tongue n Groove has worked with some of Australia’s leading architects and designers to create an inspired palette of colours and finishes for timber floors, walls, stairs and ceilings, all treated with natural oil.