Currently the most commonly used acoustical standard is International Building Code (IBC) section 1207 which specifies the sound and impact insulation within multi-family buildings.
The impact insulation (footfall noise) satisfies the code by using a laboratory tested Impact Insulation Class (IIC) 50 floor-ceiling assembly or a field tested Apparent Impact Insulation Class (AIIC) 45.
Estimation of Sound Transmission Class and Impact Insulation Class Rating for Steel Framed Assemblies.
Timber is slip-resistant, has minimal rolling resistance, contributes to sustainable design, and has a high noise reduction coefficient and impact insulation
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Impact Insulation Class (IIC) measures the transmission of sound waves caused by an object or objects striking a surface--such as a foot hitting the floor--and transmitting the sound through the material.
Impact Insulation Class becomes the measurement scale of choice when dealing with sounds created as building parts resonate from the impact of movement and the shifting of loads.