Abstract: A method for installation tongue and groove material comprising steps of: insert tongue or groove of universal device for frontal or side part into groove or tongue respectively of frontal or side part of installing material respectively under a slight angle; pressing universal device for frontal or side part respectively toward installing surface; hitting metal part of universal device attaching tongue and groove. A universal device for parquet installation comprising: metal part painted in green and metal part painted in red. During installation process these metal parts are used for hitting; wooden part painted in red having word “BACK” written on; wooden part painted in green having word “FRONT” written on it; during installation process these two wooden parts are used to press cut segment of parquet material toward metal side; and two parts of the installing tongue and groove material.