Off-site construction, including modular building systems, involves prefabrication of structural components in a controlled factory environment followed by on-site assembly. While this method ensures consistent structural quality, the segmented nature of the assembly, which differs from the monolithic nature of conventional reinforced concrete construction, may influence airborne sound transmission between units in multi-family housing. This study investigates the airborne sound insulation characteristics of residential buildings constructed using off-site methods. Measurements were conducted according to ISO 16283-1 to evaluate sound pressure levels across partition walls and floor–ceiling assemblies. Standardized omnidirectional loudspeaker sources were used to assess sound transmission loss in units. Measuredresults meet the standard sound insulation requirements for multi-family residential buildings, and supplementary analyses were performed to examine frequency-dependent behavior and identify sound leakage locations using an acoustic camera. Work supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) (Project No. RS-2025-02307141).
Kim et al. (Wed,) studied this question.