Every day we are exposed to sounds and noise. Often we do not feel the intensity of the sound, but it does irreparable harm to our health. Each 10 decibel average noise increases blood pressure 1,5-2 millimeters of mercury, which increases the risk of stroke by 10%. Constant exposure to the sound weakens the human nervous system, causing mental illness. Effect of sound waves on the human body is obvious. Security can be considered the sound level of 25-30 dB. 130 dB cause pain. As a result of industrial development, transport and infrastructure in modern life there are new kinds of noise. Intensity of the impact of sound waves on the body today is many times higher as compared to the time when the regulations were designed for soundproofing the premises. Today, these standards are insufficient to ensure acoustic comfort, which is why there is a need for additional zvukozaschitnyh materials. There is quite a logical question: how can you protect yourself from the harmful effects of sound and to provide acoustic comfort at home? Noise that we hear in his house, is 2 types: air and structural. Air-borne noise depending on the source can be external (cars, trains, planes) and internal (audio and video equipment, household appliances). Structural noise occurs when the mechanical action on the surface or at the time of the equipment and distributed mainly on the elements of home construction (working elevator, tap on a pipe). A special case of structural noise is the noise impact (heels, falling objects). Any of the varieties of sound familiar to everyone. Hyperactivity roommates or room at least once in your life annoyed all of us. The optimal solution to this problem is the qualitative zvukozaschita home. This should reflect on the stage of designing a house or apartment repair as to provide good sound insulation after the repair and finishing works on the procedure more difficult. The main parameter to assess the sound insulation of any design is the index of Rw. It shows how many decibels the noise level is reduced when using zvukozaschitnoy design. For example, conventional concrete wall with plasterboard sheets with a total thickness of 175 mm 43Db absorbs airborne noise (index Rw = 43 dB). With this level of absorption will be clearly audible loud conversation in a nearby apartment. To achieve a comfortable sound level for a person (not more than 30 dB), interior partitions must have an index Rw of at least 50 dB. Soundproofing material devepoled one company, which has an optimum combination of quality characteristics. It is a slab of glass density 14 kg/m3, 50 mm and a width of 610 mm. Scheme of a multilayer wall with the use of the material 1. Metal frame 2. Absorbent material 3. Plasterboard 4. Finishing (wallpaper, paint, etc.) index Rw of such partitions is equal to 45 dB at a thickness of 75 mm (25 mm - 50 mm soundproof drywall layer). If, instead of concrete walls as interior partitions to install such sound-absorbing multilayer structure (thickness 125 mm), the index is equal to Rw 55 dB, ie conversation in the next room you will not hear. If you set this partition as additional insulation to the concrete or brick wall, the total sound absorption of 88 dB. This option is suitable for protection from the noise of a house, for example, near the railroad tracks, as in this case, the sound of a passing train will be fully absorbed by the material. From a security standpoint the material conforms to international standards (the degree of fire resistance and flammability group EI30 "combustible materials") that has been certified fire tests. Environmental properties meet the requirements of "MPC pollutants in the air of populated areas," Claims "Shoes (approximate safe exposure levels) of pollutants in the air of populated areas", the requirements of radiation safety standards, the requirements of "Hygienic evaluation and examination of goods containing natural and artificial mineral fibers. Ordinary person solves the problem of sound insulation once or twice in your life when buying a new home or substantially renovating existing ones. Therefore, such a material property as durability is paramount. What is good in this respect, such a product? Since the material at the same time elastic, it uniformly fills the partition, and is not subject to slipping. This is confirmed by tests carried out for a long time with a special vibration installations. The intensity of the slide in this case is 20% lower than that of rock wool, which is explained by simple laws of physics: the weight of the material of glass fiber is less than rock wool, and hence the force of gravity for the duration of operation it will be affected less. The material does not crumble or break evenly fills the wall does not require additional fasteners, which greatly simplifies and speeds up the installation process.
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