Wall and floor-ceiling assemblies separating dwelling units, including those separating adjacent townhouse units, shall provide air-borne sound insulation for walls, and both air-borne and impact sound insulation for floor-ceiling assemblies.
ASTM E 90—04
Test Method for Laboratory Measurement of Air-borne Sound Transmission Loss of Building Partitions and Elements
ASTM E 492—04
Specification for Laboratory Measurement of Impact Sound Transmission through Floor-ceiling Assemblies Using the Tapping Machine
The Masonry Society
Standard for Determining the Sound Transmission Class Rating for Masonry Walls