Focusing on "Resolving Sound Leaks in Multi-Tenant Residential Partitions.", this article breaks it down one by one from the four levels of design basis, material matching, construction control and acceptance evidence, and provides parameters, practices and checklists that can be directly implemented for the design, procurement, construction and supervision teams to compare and implement.

1. Three propagation paths of sound

The sound insulation problem of partition walls and ceilings is usually not that the material is not thick enough, but that the paths are not cut off: air sound passes through gaps, impact sound passes through the structure, and lateral sound passes through adjacent walls and floors. Only increasing the surface density of the board without dealing with the gaps will have very limited effect.

2. Set sound insulation targets by space

3. Nodes that are easily ignored

Socket boxes installed back to back, pipelines passing through the wall are not blocked, the gap at the bottom of the door is too large, and the ceiling and partition wall are not connected flexibly, all will form obvious sound transmission channels. These nodes should be marked on the detailing drawing before construction, and sealing materials and methods should be specified.

4. On-site verification

• After completion, conduct on-site airborne sound insulation testing and record frequency band data.
• Measure background noise and reverberation time in key rooms.
• When weak points are found, prioritize gaps and lateral paths.
• Retain the test report as a basis for delivery and acceptance.

Sound insulation is a systematic project. Only by cutting paths, sealing nodes, and retaining data can we obtain reproducible acoustic effects.