Best Blocking (STC 50) – Full Height Walls (Preferred)

January 1, 1
A sound blocking level of STC 50 means that a listener in a quiet room would need to exert effort to hear raised speech levels in adjacent rooms, and the speech would not be understandable or disruptive. Acoustic standards, guidelines, and building rating systems require an STC 50 rating between rooms such as classrooms1, conference rooms 2, 3, executive offices2, patient exam rooms, treatment rooms and consultation rooms4





1 ANSI/ASA S12.60-2010/Part 1 American National Standard Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools, Part 1: Permanent Schools. (
2 U.S. Green Building Council (USGBC), Leadership in Energy and Environmental Design (LEED), version 4. ( 
3 International WELL Building Institute, The WELL Building Standard, v 1, February 2016. Access the standard at
4 2014 edition of the Facility Guidelines Institute (FGI) Guidelines for Design and Construction of Hospitals and Outpatient Facilities. (
5 The referenced laboratory test(s) are part of an extensive, multi-year, testing program conducted by the National Research Council Canada (NRCC) and published by the Institute for Research in Construction (IRC). For more details, including 1/3 octave band transmission loss data, refer to internal reports IRC-IR-693, October 1995 and IRC-IR-761, March 1998. The research program was partially funded by ROXUL, Inc. ROCKFON and ROXUL are subsidiaries of the ROCKWOOL Group.

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