Lessons in large-sample laboratory sound transmission loss testing

Abstract

Thousands of laboratory sound transmission loss tests, in accordance with the ASTM International Test Method E90, reveal some trends that challenge multiple aspects of building sound isolation. Some notions about sound transmission through building assemblies are accepted industry-wide that these current studies bring into question. The applicability of the Sound Transmission Class (STC) rating system also becomes challenging when observing trends in large and varied data samples. From preliminary small-sample studies to measure uncertainty across laboratories to large-sample observations of assembly test data, this presentation offers guidance for both the development of standards in the building sound isolation industry and for education in the building design process.