The stage of preparing the floor for screed is to cleanse the surface of the overlapping of excess waste and dust. In addition, the floors need a primer, and possible cracks in lighting with a thick solution. Even all walls and partitions must be fenced from moisture absorption. How to provide it? Glue the strip of roofing material on the very bottom of the walls so that, its upper edge protrudes approximately 15 centimeters above the level of the future screed.