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Are we required to have an acoustical consultant in order to attempt this credit?

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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

dB & STC

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Helena Garcia
Sustainability consultant
PGI ENGINEERING
LEEDuser Basic Member
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I'm working with a Spain Project. Spain doesn't use STC Rating, Spain assesses with dB. Can you say me what is the relation between STC and dB? How I can convert the dB into STC? Thank you.

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Daniel Hicks
Daniel Hicks, E.I., INCE
Geiler & Associates
LEEDuser Basic Member
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Fri, 09/16/2016 - 16:46

Unfortunately you can't convert between the two with a calculation. STC is a single number that is derived using 1/3 Octave Band dB measurements from 125 Hz to 4 kHz. You can research the ASTM E 413 standard if you're interested in seeing what's involved. There is no way to go from an STC rating back to decibels.

Mon, 02/25/2019 - 08:16

Hola Helena, ¿Conseguiste justificar el crédito? Y si es así, ¿cómo lo hiciste? Gracias!
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Helena Garcia
Sustainability consultant
PGI ENGINEERING
LEEDuser Basic Member
5 thumbs up

Wed, 02/27/2019 - 15:09

Sí, lo conseguí! Busqué información sobre STC, es un valor de resistencia sonora que puedes calcular segun la sección constructiva de cada división. Parecido al cálculo de transmitancia térmica.

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