NRC and STC relationship
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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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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Go here and scroll to the third post down
https://are5community.ncarb.org/hc/en-us/community/posts/360050798834-Study-Materials?mobile_site=true -
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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I think the question was worded poorly. to recap the question asks: "Materials or Assemblies with a high noise reduction coefficient (NRC) generally have a "
and the answers (A) high sound transmission class (STC) , (B) low STC, (C) high reverberation time, (D) low absorption coefficient.
If i just think about the WORDS, "sound transmission", then yes, i want the sound transmission to be lower. But if i add the word "rating" to my thoughts, then I would want a higher STC rating, to transmit less sound.
the answers in the Ballast question didn't include the word "rating" ... so i guess that's what's messing with our reasoning? Hopefully NCARB questions will be worded with less confusing statements.
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