One of the objectives in studying Mesoamerican mortars, stuccos and plasters is to determine the building techniques employed and, if possible, to establish a relation between these techniques or methods of construction and the time or period of their use. The approach has been through chemical analysis and physical inspection of the building elements as well as through consideration of the function of the element. The study of floors appears to present some unique advantages in studying changes in building techniques since they are frequently datable by association with pottery, monuments or structures of known age. A preliminary study of the floors at Uaxactún indicates that: floors improved in quality from Chicanel to Tepeu times; post-Chicanel plasters were treated with a wash coat, especially the painted one; and the use of many small chips in Tzakol and Tepeu plasters implies extensive stone carving, because it is unlikely that stone would have been broken into such small pieces just for floor constraction. See also AATA 2-1055, 3-2835, 17-1482, 17-1404, 17-1485, and 17-1486.