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MD: Bladensburg

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Sound Abatement & Noise Control

This presentation introduces the concepts of mitigating unwanted noise using concrete masonry assemblies and systems. Topics covered include a basic review of sound and noise, what requirements are mandated by building codes to address sound control, how to determine the sound transmission class and inside-outside transmission classification of building assemblies, noise reduction coefficients, and proper methods of detailing concrete masonry systems to maximize its effectiveness as a sound barrier.

Learning Objectives

  1. Common sources of internally- and externally-generated sounds and code minimum requirements for mitigating unwanted noise.
  2. Standardized means of calculating the sound transmission class (STC) and outside-inside transmission classification (OITC) of concrete masonry assemblies.
  3. Reflected versus absorbed sound and the role of the noise reduction coefficient in concrete masonry design.
  4. Appropriate layout and detailing options for maximizing sound reduction within buildings for optimum user comfort.

Keywords:  concrete masonry, sound control, sound transmission class (STC), outside-inside transmission class (OITC), International Building Code, ASHRAE 189.1, sustainability, noise reduction coefficient (NRC), detailing, building layout