These are not enforced by local jurisdictions, at least not lately, but they may become popular among the litigious crowd.
Hard surfaces: Use underlayment under tile/hardwood.
Bare concrete (stained) while hip is a tough surface to clad to meet IIC.
Soft vinyl and carpeting approach 50 IIC plus.
Links:
How resilient channels absorb sound waves. Resilient channels lose their effectiveness when they are "shorted out".
IIC definition. Shows axon sketches of different material configurations.
Sound deadening materials. And techniques, too.
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