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HandWiki. Sound Transmission Class. Encyclopedia. Available online: https://encyclopedia.pub/entry/30832 (accessed on 25 September 2026).
HandWiki. Sound Transmission Class. Encyclopedia. Available at: https://encyclopedia.pub/entry/30832. Accessed September 25, 2026.
HandWiki. "Sound Transmission Class" Encyclopedia, https://encyclopedia.pub/entry/30832 (accessed September 25, 2026).
HandWiki. (2022, October 24). Sound Transmission Class. In Encyclopedia. https://encyclopedia.pub/entry/30832
HandWiki. "Sound Transmission Class." Encyclopedia. Web. 24 October, 2022.
Sound Transmission Class
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The content is sourced from: https://handwiki.org/wiki/Physics:Sound_transmission_class

Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the Sound Reduction Index (SRI) ISO index is used. The STC rating very roughly reflects the decibel reduction of noise that a partition can provide. The STC is useful for evaluating annoyance due to speech sounds, but not music or machinery noise as these sources contain more low frequency energy than speech. There are many ways to improve the sound transmission class of a partition, though the two most basic principles are adding mass and increasing the overall thickness. In general, the sound transmission class of a double leaf wall (e.g. two 4"-thick brick walls separated by a 2" airspace) is greater than a single wall of equivalent mass (e.g. homogeneous 8" brick wall).

building partition sound transmission decibel

References

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  37. ASTM E1332-16 (2016). "Standard Classification for Rating Outdoor-Indoor Sound Attenuation". Conshohocken, PA: ASTM International. https://www.astm.org/Standards/E1332.htm. 
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