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Our project has small meeting rooms in an open-office plan. This situation appears to require an STC of 50. However, this level seems to be (unrealistically) high, especially considering the doors in the wall partition. STC 50 with a (closed) wall can be

Sound transmission requirements for adjacency combinations are listed in Reference Guide Table 1, but not all combinations are included. For example, an STC rating requirement is not provided for conference room and standard/executive office adjacency. Is

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NC-v4 EQc9:Acoustic performance

Sound transmission - STC vs Rw

Hi, It is told that Rw is very similar to STC, I would like to ask for Sound transmission, Does LEED recognize the use of Rw (Weighted Sound Reduction index) and ISO 140 (acoustic) standard instead of STC?. Thank you.

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Ken Shook
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Longman Lindsey
LEEDuser Expert
6 thumbs up

Thu, 02/15/2018 - 22:44

The STC rating is typically very similar to Rw but they are not always exactly equivalent. When faced with this issue in the past we have calculated the STC rating from the 1/3-octave transmission loss data from which the Rw is calculated, then submitted the STC data for LEED.

Wed, 04/18/2018 - 15:38

Dear Ken, could you please share with us more details about calculating STC rating from Rw value? I can't find any info regarding this anywhere...
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Ken Shook
Partner
Longman Lindsey
LEEDuser Expert
6 thumbs up

Tue, 04/24/2018 - 13:37

Hi Anastasia, the calculation procedure for calculating STC is outlined in ASTM E-413 (https://www.astm.org/Standards/E413.htm). You will need to obtain the 1/3-octave band transmission loss data that was used to calculate the Rw. Once you have this follow the procedure outlined in the standard to determine the STC rating.       

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