The evolution of soundproofing standards within the National Building Code of Canada (NBC) offers a fascinating journey through nearly eight decades of architectural and acoustic advancements. Beginning in 1941 with a modest requirement of a 45 dB sound transmission loss between dwelling units, the code has undergone a series of revisions and enhancements, reflecting both technological progress and societal needs.

From the initial focus on basic sound attenuation to the incorporation of more sophisticated metrics such as the Sound Transmission Class (STC) ratings, and later, the Apparent STC (ASTC) measurements, each iteration has aimed to address emerging challenges in noise control and ensure enhanced living environments for occupants. This article traces the key milestones in the evolution of soundproofing regulations within the NBC, highlighting significant amendments, pivotal additions, and the ongoing considerations for future updates in response to evolving building practices and acoustic standards.

The progression of the NBC, from 1941 through to the most recently adopted edition in 2020, contains a progression of the acoustical requirements for residential dwellings. From the earliest point in time, a minimum of sound transmission performance was stipulated to limit intrusive noise between dwellings. Further investigation is underway to determine if further additions and refinements of the NBC are favoured which could occur within the next publication expected in the year 2025.