75 series of light steel keel wall double-sided double-layer 12 thick plaster board filled with sound insulation noise can reach the number of decibels
Theoretically, the main factors influencing the sound insulation of the gypsum board wall are as follows:
1) the law of quality: there is a common law for the insulation of the partition, that is, the heavier the material (the greater the surface density) the better the sound insulation. For a single layer of dense uniform wall, surface density for each doubled, the sound insulation in the theoretical increase of 6dB, this law is the law of quality. For the double layer of gypsum board wall, the law of quality plays an important role, that is, to increase the number of layers or thickness of the board can be improved sound insulation. As the keel double wall system sound vibration form is very complex, so the embodiment of the law of quality than the simple single-wall complex.
2) Resonant frequency: any partition wall there is an inherent resonance frequency, when the sound wave frequency and wall resonance frequency, the wall as a whole resonate, the frequency of the sound insulation will be greatly reduced.
Single-layer gypsum board sound insulation is poor, for example: 12mm thick, surface density of 10Kg / m 2 or so of paper gypsum board standard weighting noise C = 29dB. Even if the four layers of such gypsum board stack and together in the sound insulation on the theoretical Rw can only reach 41 dB.
If the paper gypsum board made of double-wall structure, the sound insulation can be improved. Such as the above four layers of paper gypsum board made 75mm light steel keel double double wall, Rw can reach 44dB. If the cavity is filled with cotton, Rw can be increased to 50dB.
Light steel keel gypsum board system is usually double-sided wall structure, that is, "plate - keel (cavity) - plate" structure, each side of the wall board for the single or double gypsum board, Light steel keel. In order to obtain better sound insulation effect, in the cavity filled with rock wool board or glass wool.
