A.Michael Byrne responds: On the surface, a tile's suitability for a particular application may not be readily apparent. The strength and durability of a tile are determined by the ingredients making up the bisque, or body, of the tile; the type of glaze used, if any; and how long and at what temperature the tile is fired.
Wall tiles often have decorative or high-gloss glaze applications that are really appropriate only on wall surfaces. Floor tiles, on the other hand, may be used for either floor or wall applications.
to read the full article.