Sound Transmission Loss

Increase your building product’s noise insulation by understanding its sound transmission loss

Differentiate your product and ensure you meet the necessary requirements of noise insulation through sound transmission loss testing. Gauge how your building product or system will isolate noise from one area to an adjacent area. This includes the sound transmission loss from two rooms inside a building or from the outside of a building to the inside of the building.

By partnering with Intertek to help you understand your building product’s noise insulation, you gain access to accurate acoustical performance measurements and reduced turnaround times. With our experience testing to AAMA, ANSI, ASTM, ISO, and SAE standards, we can help evaluate the sound transmission loss of your products.

What is sound transmission loss?

Sound Transmission Class (STC) and Apparent Sound Transmission Class (ASTC) are single number ratings used to test the performance of interior walls and floor-ceiling assemblies when exposed to speech, radio, television, and other similar sources of noise.

Outdoor-Indoor Transmission Class (OITC) and Apparent Outdoor-Indoor Transmission Class (AOITC) are single number ratings used to rate the noise isolation of exterior walls and façade elements that are exposed to transportation and other low frequency noise sources.

The STC and OITC ratings are the results from testing conducted in a controlled laboratory environment while the ASTC and AOITC ratings are the results from testing conducted in the field.

Which types of products benefit from sound transmission loss testing?

  • Roofing
  • Wall Systems
  • Windows / Vents / Skylights

Laboratory Test Equipment

  • Reverberation Chambers for specimens up to 14’ x 10’ x 12”
  • National Instruments/ ViAcoustics Trident Analyzer
  • 29mm, 57mm, and 100mm Impedance Tubes

Field Test Equipment

  • National Instruments/ ViAcoustics Trident Analyzer
  • Microphones & Preamplifiers
  • Loudspeakers
  • Tapping Machine
  • Reference Sound Source
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