Abstract
Intrusion of outdoor noise into buildings interferes with many activities. This activity interference can be controlled by proper design and construction of the building's exterior envelope. Specifying that all components should have sound transmission class (STC) ratings equal to the desired difference between outdoor and indoor A-weighted sound levels would have an appealing simplicity, but has several shortcomings. These are detailed in the course of presenting a straightforward procedure for determining suitable STC values for the components of the exterior envelope. Particular attention is given to dependence of the noise reduction on characteristics of the exterior sound field and the sound transmission properties of the building envelope.
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