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Impact Sound Insulation at Floor

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Impact Sound Insulation at Floor

In general, sounds of impact and of hitting are defined as foot-traffic noises. Such type of noises creates a frequent and continuously repeating effect in flooring of the building. If a flooring has a sufficient weight, it will provide satisfactory protection against air induction noises. However, it will have no influence on impact-induced noises. In fact, such type of noises has a much higher energy compared to air induction noises and by affecting directly the structure, they cause vibration and the transmission of the high noise.

The dynamic stiffness of a good quality insulation material to be used against the noise of heels should be between 7-35 MN/m3.4

As the dynamic stiffness increases, the value of noise reduction of the material decreases. The reason is that the material is much rigid, so that its effect of vibration isolation causing the noise decreases. Dynamic stiffness is used for the calculation of insulation specifications of a floating floor material. It shows the elastic deformation capacity of the material and decreases the dynamic stress (foot-traffic). Noise insulation materials used for flooring work as pre-loaded due to the weight of the screed. As the stiffness of the material increases, the dynamic stiffness decreases. Also, a very low dynamic stiffness is not preferred. Otherwise, the material might be compressible and cause refraction.

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VIBRATION Control and SOUND Insulation.