In apartment there should be a good sound insulation, that is external noise or the noise arising in one of premises, should not extend on apartment. .
It is known, however, that in many apartments sound insulation unsatisfactory. We hear conversations of neighbours, radio and other sounds stirring to us. To make premises isolated from noise penetration, it is necessary to block a way to distribution of sound waves through walls, partitions, doors, windows and other protecting designs. It is easy for making at apartment repair usually enough. .
sound Distribution . Noise from one premise can extend in another through the air environment, so-called air noise and through constructional materials (shock noise). Music, songs, conversation, etc. are transferred basically through the air environment. Circulation or dances in the apartment located above, various knocks and partially radio sounds are audible through a ceiling. These are shock noise.
In usual conditions stir basically air noise. To isolate a premise from shock noise it is much more difficult.
Air noise are well extinguished by massive and heavy designs. For example, brick internal walls absorb noise, than wooden is much better. However and it is possible to make a soundproof wall of a tree. In this case the internal wall becomes double and the interval is filled with a soft sound-proof material, for example, mineral cotton wool, mineral felt. Thus both walls should not incorporate among themselves nails, bolts and other rigid details. Instead of boards for a wall it is possible to use plaster, drevesnostruzhechnye, wood-fiber, kostrovye, plaster or fibrolitovye plates.
Improvement of sound insulation of partitions by a separate covering from boards. The upholstered partition becomes covered to top by floor-mats from mineral cotton wool or soft wood-fiber plates in the thickness of 3-5 sm (they are desirable for placing in two layers in the general thickness of 3 sm), the wadded panels embroidered with a gauze or carpets from a tow, and also multilayered hanging paper carpets. When all wall is covered, in several millimetres from a covering of 4 sm which bottom ends are beaten naklonno by the hammered nails to a floor, and the top ends to a ceiling are established vertical bruski in the thickness. To a concrete ceiling it is necessary to fix preliminary a horizontal board to which the top ends of vertical boards are beaten. .
The Distance between axes of vertical boards depends on that, than the partition is sheathed. If the covering from boards, this distance can be 60-80 sm, from plaster plates - 40 sm, from drevesnostruzhechnyh, kostrovyh, fibrolitovyh plates - 50 see the Best sound insulation the covering from fibrolitovyh plates with a lining from mineral cotton wool in the thickness of 5 sm, and the least - a paper covering with firm wood-fiber plates possesses. The internal wall between premises becomes more soundproof and in the event that a wall obbit boards or fibrolitovymi plates attached to it by means of laths 6Х6 sm and if an interval between a wall and a covering to fill not with sawdust, and dry sand.
Improvement of sound insulation of doors . Often the partition has good sound insulation, but the door being in it passes any sounds. If this door do not use, it usually block a case that in most cases helps a little; it is necessary on nishevuju to hang up the party pair of wadded carpets, a door niche to veil thick curtains or to sheathe plaster plates and to paste over with wall-paper. Carpets are recommended to be made of a gauze or other thin double fabric between which to sew up a layer of cotton wool in the thickness 4-5 These carpets see are attached to a door box so that between carpets, and also between a carpet and a door there were air layers. .
If a checkpoint, it it is necessary to alter a door at a double door. For sound insulation improvement it is desirable to hang up between two doors curtains from a thick fabric which at opening of doors can be removed aside. To improve door sound insulation its upholstery any soft material helps.
Other possibilities of improvement of sound insulation . Often wooden partitions are under construction without zasypki or with easy opilochnoj zasypkoj. It is possible to receive good results if opilochnuju zasypku in partitions to replace dry sand zasypkoj. For the same reason in interfloor overlappings it is possible instead of easy thermal zasypki to apply sand or clay.
The Floor is necessary for protecting basically from shock noise. It is helped by soft carpets, and partially and soft materials for a covering of floors (rubber, linoleum, etc.).
Sound insulation often worsens because of occurrence of the cracks caused osadkoj of walls and partitions. Even the small crack between a partition and overlapping passes sounds and worsens sound insulation of all partition. Sound insulation is worsened also by subsidence zasylki in partitions. .
Therefore before a covering it is necessary to close up and proshpaklevat cracks between partitions and a ceiling, and also to fill zasypnye partitions sand or clay zasypkoj to a ceiling.