Noise‐insulation requirements for multi‐family dwellings

Abstract

Noise insulation standards are part of the California Administrative Code (Title 25, Section 1092). These standards apply to all new multi‐family dwelling units such as hotels, apartments, duplexes, townhouses, and condominium units. Detached single‐family dwellings are specifically excluded. The standards establish minimum requirements for the isolation of interior spaces from exterior noise and set minimum ratings for noise insulation of partitions between dwelling units. A community noise equivalent level (CNEL) of 45 dB is set as the maximum for intrusive noise from exterior sources such as rail or road traffic, or aircraft operations. American Society for Testing and Materials (ASTM) testing procedures for party wall and floor/ceiling system sound transmission provide the basis for setting minimum acceptable performance for separations between units. As a consultant to builders, planners, and architects, the site planning and design of residential projects have been examined and field evaluations have been performed on completed projects. Building designs and the selection of suitable building elements (wall construction composites, window assemblies, vent configurations, etc.) which assure compliance with the standards have been identified. The paper provides a brief description of the standards, their enforcement pitfalls, and an assessment of their impact on residential construction in California.