After all preparatory work, you can proceed directly to the formation of the screed. First you need to pour into the places where there will be guides, a layer of expanded clay. As guides, you can use the rules that are aligned using the level. The material fraction should be no more than 5 mm. Due to the fact that expanded clamps have a different size, the material is evenly distributed on the surface. A layer of sprinkled expanded clay should be at least 3 cm.