The Anatomy of an IIC Rating

In architectural acoustics, Impact Insulation Class (IIC) ratings are a well-established design metric used for any multifamily or multi-tenant building. As consultants, we are familiar with prescribing the appropriate IIC requirements for new projects, but it is the author's belief and experience that very few understand how to methodically predict or even design floor-ceiling assemblies to them. Many variables and questions exist, including the effect of adhesives or various floor coverings on the final outcome. This paper will present an introductory look into the "Anatomy of an IIC Rating." Lab test data is used to develop potential classifications of common elements and possible trends to explore.