base element when laying tiles and or plates on a wall according to this design variant the device has a semicircular shape with a spacer web 9 along the straight edge fig4 illustrates the use of different embodiments of the laying aid 1 according to the invention for laying tiles the schematic illustration in part a of fig4 shows the uses for the so called composite joint whereas part b of fig4 shows the conditions for an offset joint in fig4 the tiles are denoted by reference numeral 16 in each case in both parts of the figure in each case a vertical wall border 17 delimits the side and a horizontal floor border 18 delimits the bottom of the surface 19 to be covered with tiles 16 in the composite joint patterns shown in fig4 a in each case four tiles 16 adjoin one another at their corner regions at positions 20 laying aids 1 according to one of lines a b c of column 1 1 in fig3 may be used at these positions 20 depending on the desired joint width at positions 21 in each case two tiles 16 adjoin one another as well as the wall border 17.