Outline
A cladding element (1) having a walking surface (2), a parallel base surface (3) and at least four side surfaces (4, 5, 6, 7) and a spacer element on at least two side surfaces (4, 5, 6, 7). 8, 9), characterized in that a groove (10) is formed in its walking surface (2) connecting its two side surfaces (4, 5, 6, 7) and having the same width (Sh) as the width (St) of the spacer.