Abstract
The object of this paper is to clarify the relation of the tactile roughness of building materials to the physical one. The tactile roughness of twelve samples were determined by the paired comparison method. The coefficients of friction were adopted as the physical roughness. To satisfy the purpose, A ROUGHNESS TESTER has been developed. A good correlations between them can be obtained by the equation below : Z_j=2.70logμ+1.08 where Z_j : Tactile roughness value μ : Physical roughness value
