Interior Design Implementation (IDIX) 2 Practice Exam

This is about how impact noise through floor/ceiling assemblies is quantified using a tapping method. Impact noise comes from physical contact, like footsteps, and travels through the structure to the space below. The standard that specifies this tapping-test approach is ASTM E492. In practice, a tapping machine on the floor creates repeated taps while receivers in the room below measure the resulting sound levels; the results describe the assembly’s ability to isolate impact sounds, typically reported as the Impact Insulation Class (IIC). This method is different from airborne measurements, which assume noise travels through the air and are measured with loudspeakers and microphones to assess how well partitions transmit airborne sound. The other standards listed pertain to airborne sound transmission between rooms or partitions, not to the tapping-based impact measurement. Therefore, ASTM E492 is the standard that uses the tapping method to evaluate sound impact transmitted through floor/ceiling assemblies.