Developing Classifications using a Dual-Rating Method of Evaluating Impact Noise

In the United States of America (USA), most building codes have limited requirements for airborne and impact sound isolation in multifamily residences, and it is left to the project developers to voluntarily implement improved acoustical designs based on experience, advice, fear or other motivation. The authors have worked to develop floor-ceiling assembly designs for several large multifamily housing developers who are responding to occupant demands for greater isolation than provided by the Building Code. As part of the design process, a large number of field and laboratory tests were performed, allowing comparison between acoustical results and occupant satisfaction. To evaluate the assemblies in the field, the authors utilize a two-rating method of evaluating impact noise isolation [LoVerde and Dong, J. Acoust. Soc. Am. 141, 428 (2017)], in which low and high-frequency components are evaluated independently. The two-rating method has proven more effective than the existing single number ratings for predicting probability of acceptance, evaluating products, and providing guidance for future design improvements. A set of classifications based on the two ratings is developed and compared to existing classification schemes such as COST Action TU0901 and the International Code Council Guideline for Acoustics.