Walls without door openings separating the bedrooms are subject to increased sound insulation, walls separating living quarters and sanitary rooms.

These walls must be filled with thermal insulation with a high specific weight and covered with double plasterboard or gypsum fiber board..

To increase the acoustic insulation of the ceiling and to avoid the creaking effect of the floor, sheathing boards or floor boards must be insulated from the ceiling structure. Rubber gaskets can be used as insulation, polyethylene foam or felt.