Acoustical Panels 1

[Kuhuh]

Say if I have a 8" fully grouted CMU wall. Normal STC Rating of roughly 55. We are to install acoustical Sound panels perfm. metal with a 23% opening and with a 2 inches thick, 2.5 pcf density fiberglass sound absorber encased in 2 mil thick, black, PVC embossed vinyl that has a 90% NRC.

Now do you add the STC rating of the panels to the wall or do you consider only the higher value.
IE
Wall=STC-55
Panels=STC-35

STC rating= 95?
or STC Rating STC-55

 

[vpl]

This may be a good question for forum403; although I'm not entirely certain. If you decide to post over there, please "red flag" this post by clicking the words in the bottom center of the thread (Inappopriate post? If so, Red flag it!) and tell the system administrator that you've moved the question to a more appropriate forum.

If you decide to leave it over here, realize that not everyone here is in your discipline. You will get a better response if you don't use "TLA's" (or three letter acronyns) of which I counted five in your post. One tripped me up, because the meaning that I would normally assign to it (NRC= Nuclear Regulatory Commission) makes no sense in terms of your post. People might have cross-discipline experience that would apply but not realize it because they are not familiar with the particular accronyms you are using. Therefore please consider defining your accronyms.

Patricia Lougheed

******

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

 

[GregLocock]

Kuhuh- think about it carefully. If you were to consider building an additional identical wall inside the noisy room, the noise in the room would be unchanged. The noise outside the room would be 6 dB quieter (roughly). I'm sure Beranek discusses this.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[cloa]

Actually the correct forum is Mechanical/Acoustic Engineering.

http://www.eng-tips.com/threadminder.cfm?pid=384

And spell out your acronyms.