NRC and STC relationship

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Somayyeh Ramezani

October 14, 2020 17:25

Hello friends,

Need your insights here:

• Materials or Assemblies with high NRC generally have a low STC. (coming from Ballast sample questions) 

Why I'm confused with this statement! A higher NRC means the assembly absorbs more noise therefore is should transmit less sound which is lower STC. But then a wall with higher STC rating is better than a wall with lower STC rating in terms of sound transmission. I'm missing something here that I cannot figure that out!

 

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  Gang Chen October 14, 2020 22:37

  See the following link for the differences between NRC and STC:

  https://workingwalls.com/nrc-and-stc-what-are-they-whats-the-difference/

  Gang Chen, Author, Architect, LEED AP BD+C (GreenExamEducation.com)

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  Agustina Rodriguez October 16, 2020 17:51

  Gang, very very helpful. Thanks!

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  Michael Ermann October 17, 2020 00:20

  Go here and scroll to the third post down
  https://are5community.ncarb.org/hc/en-us/community/posts/360050798834-Study-Materials?mobile_site=true

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  Gang Chen October 17, 2020 05:01

  Agustina,

  Thanks for the kind words, I am happy to help.

  Gang Chen, Author, Architect, LEED AP BD+C (GreenExamEducation.com)

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  Somayyeh Ramezani October 22, 2020 19:34

  Thank you Gang and Michael ... 

  Both comments was really helpful and I think I understood the differences by now. I appreciate your time.  

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