The document provides specifications for installing terrazot tiles in risers of steps, skirting, and dado. It outlines requirements for tile thickness, preparation of the surface with plaster and mortar, laying the tiles with cement slurry, finishing, measurements, and rates. Tiles must be a minimum of 12mm thick and set in mortar, with joints as fine as possible. Height is measured to the nearest 5mm or cm depending on size, and the rate includes all materials and labor for the tile installation.