Which standard measures sound transmission through floor/ceiling assemblies using tapping (impact) methods?

• A. ASTM E90 measures airborne sound between partitions
• B. ASTM E336 measures airborne sound between partitions
• C. ASTM E414 measures airborne sound between rooms sharing plenum
• D. ASTM E492 measures sound transmission through floor/ceiling assemblies using tapping

Answer: (D)

Impact noise is the type of sound that travels through a floor/ceiling assembly when someone footsteps or objects strike the floor. To quantify how well a floor/ceiling assembly blocks that kind of noise, the tapping machine is used to imitate those impacts and standardized measurements are taken in the receiving space. ASTM E492 is the standard that specifies this exact testing approach—using a tapping source on the floor and microphones in the receiving room to determine the assembly’s ability to isolate impact noise. The result is an impact-related rating that reflects performance against tapping (footstep-like) sounds.

Other standards focus on airborne sound transmission between partitions and do not use tapping as the energy source, so they don’t measure impact transmission in floor/ceiling assemblies.