Foam or

The thickness of such a screed is usually about five centimeters, but if you want to “raise” the floor, then they use polystyrene foam or expediency, which, incidentally, differ in good heat indicators — and sound insulation. To perform work, a reinforcing welded grid will be needed, and if the area is large enough, it is recommended to make technological sections in the center of the room, which prevent the appearance of cracks. To obtain a perfectly flat and smooth surface, self -leveling mixtures are used. If the irregularities of the surface do not exceed two centimeters, then aligning it is much easier than making a new screed.