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Lesson 22 - Codes Testing Sound Transmission Class(STC...

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Codes & Testing : Sound Transmission Class (STC)
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Definitions : Sound Transmission Class rates a partition’s resistance to airborne sound transfer at the speech frequencies (125-4000 Hz). The higher the number, the better the isolation. STC Strength: Classifies an assembly’s resistance to airborne sound transmission in a single number. STC Weakness: This rating only assesses isolation in the speech frequencies and provides no evaluation of the barrier’s ability to block low frequency noise, such as the bass in music or the noise of some mechanical equipment. Recommended Isolation Level Below are the STC ratings of various wall assemblies, each presented to help illustrate concepts, improvements and rules of thumb. The estimated ratings are based on laboratory test results from various compendiums of STC ratings. It is recommended to consult a professional acoustician for more detailed information or to analyze the specifics of your project/assembly. 1. Insulation will noticeably improve the STC rating of an assembly. Description Estimated STC Rating Wall Assembly 3 5/8" metal studs, 5/8" gyp (2 layers total), No insulation 38 - 40
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