Evolution of the Acoustical Provisions Within the Model National Building Code of Canada

Authors

  • Todd Busch Todd Busch Consulting

Abstract

This paper explores the evolution of the National Building Code of Canada (NBCC). Starting in 1941, the NBCC required sound insulation of walls and floors between dwelling units to be sound transmission class (STC) 45. There were restrictions on the attachment of fixtures. Refuse chute construction was described. In 1956 references to compromising air leaks were introduced. In 1965, STC 45 performance was added for a variety of service rooms. ASTM E90-61T was introduced. Minor changes occurred in the 1970, 1975, 1977, 1980, and 1985 versions. In 1975, a table was added showing sound ratings of assemblies. In 1990, STC 50 was introduced along with an STC 55 provision for elevator shafts and refuse chutes. In 1995, a larger table of expected sound ratings was included. No significant changes occurred for the 1995 or 2005 versions. The 2010 edition saw language added for secondary suites where an STC 43 rating was stipulated. The 2015 version added in the option of demonstrating either an apparent STC (ASTC) performance of 47 or STC 50. Additional reference was made to ISO standards in regards to flanking paths. Future changes are being considered for impact insulation class (IIC), exterior noise control, and low-frequency sources.

Author Biography

Todd Busch, Todd Busch Consulting

MASc, PEng, PE, INCE Bd Cert. Studied noise control for Master's degree; worked professionally in acoustics for 24 years since 1994.

Additional Files

Published

2021-08-17

How to Cite

1.
Busch T. Evolution of the Acoustical Provisions Within the Model National Building Code of Canada. Canadian Acoustics [Internet]. 2021 Aug. 17 [cited 2024 Nov. 24];49(3):8-9. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3915

Issue

Vol. 49 No. 3 (2021)

Section

Proceedings of the Acoustics Week in Canada

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