Inaudible steps

With the improvement of the quality of housing, when the question of the number of square feet ceased to be the sole determining factor, the problem of sound insulation of residential premises is becoming increasingly important. Impact noise - a kind of structural noise - is the result of mechanical action (steps blows falling on the floor of subjects, etc.) for building elements. It also extends easily to shut and emitted into space in the form of air noise. Sound insulation for sound insulation is also important massiveness of overlap, but for the standard to 60 dB for apartments, it must be several times greater than for the standard of air noise, that neither technically nor economically irrationally. Therefore, for the sound insulation is necessary to use special constructions of gender. To date, the most effective method to fulfill regulatory requirements for sound insulation (Lnw = 60 dB) is a unit of so-called floating floor. It implies the existence of an elastic layer of insulating material thickness of 10-40 mm, which fits reinforcing mesh and a layer of concrete is poured or placed a plate made of gypsum, asphalt and other similar material thickness of 30-50 mm. Slab or screed, in addition, must be separated from the room's walls elastic strips to prevent "acoustic bridges." Soundproofing materials for protection against impact noise, are porous materials with low modulus of elasticity. Their ability to isolate impact noise caused by the fact that the velocity of sound in them is much smaller than in dense materials with high modulus of elasticity (for example, in reinforced concrete - 4100 m / s, while the foam rubber - 30 m / s). In order to save on sound insulation materials are used by many so-called soft floors - carpets, linoleum on the basis of foam, etc. In this case, scattering most of the impact energy occurs in the zone of direct contact, such as foot and floor. In cases where the only possible solid flooring - ceramic, parquet, hard linoleum, etc., they are satisfied with the use of so-called sound-insulating strips that are placed by or under the floors themselves, if possible, for example, under the floorboard or a leveling screed. The latter is more effective with an acoustic point of view, since in this case, the effect of sound insulation is not only due to the scattering of vibrational energy in the pad, but also by reducing the amplitude of the elastic system of "floor slab - gasket - screed and the floor." Herein, the massive (up to a certain limit) will buckle and the floor, the better will run the entire system. Sound insulation pads from whatever material was not arranged the floor, in ensuring the required soundproofing rooms best to immediately consult specialists. Sometimes professional acoustics a glance, to immediately evaluate the effectiveness of the proposed action or materials used. After all, most unpleasant - is to spend time, effort and money, and do not feel the results.