If the height of the ceiling allows it to be slightly reduced, you can do this: put the lags on the litter of cork material, and fill the cavity between them with mineral wool stitches, and then eliminate the gap of soundproofing with a layer of black plywood. If the height from the ceiling is low and is, for example, 2.5 m, it is better to resort to the help of cork material, panels with a thickness of 20 mm, which are laid on the floor in front of the screed itself. Before performing a screed with a cement mortar on a stacked sound insulation, place a cork strip around the perimeter of the room and observe the thickness of the screed, as a result of which the walls of the house will not come in contact with the floor plane, and in turn, the stream of noise waves will decrease.
How to choose an inexpensive sound insulation: criteria