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Sound Transmission Through Gypsum Board Walls

INTRODUCTION. This paper describes additional findings from a project to study sound transmission through cavity walls constructed from gypsum board using industry-standard details and carefully selected materials1. The project was initiated because of increased sound insulation requirements in the 1990 National Building Code of Canada, the removal minimum weight requirements for gypsum board in Standard CAN/CSA-A82.27-M91, and the realization that much of existing published data is obsolete or unsuitable. By making all measurements in a single laboratory, differences among laboratories were avoided and details of specimen construction could be controlled closely. The full report of the study2, in terms of STC only, provides for builders and regulators a reliable and consistent assembly of sound transmission class (STC) data. About 400 wall systems were tested to examine many parameters but only a few issues can be discussed in this paper. A more detailed report is in preparation.