This Standard was prepared by the Australian members of the Joint Standards Australia/Standards New Zealand Committee AV-001, Acoustics, to supersede AS ISO 717.2—2004, Acoustics—Rating of sound insulation in buildings and of building elements, Part 2: Impact sound insulation.

The objective of this document is to provide a method whereby the frequency dependent values of impact sound insulation of building elements and in buildings (from both laboratory and field measurements) can be converted into a single number to characterize the acoustical performance.

This document includes methods for determining single-number quantities for tapping machine measurements, as well as methods for determining single-number quantities for impact ball measurements. While tapping machine measurements are currently referred to in the Australian National Construction Code (NCC), impact ball measurements are not.

It should be noted that achievement of a weighted normalized or weighted standardized impact sound level that is at or below a design numeric value does not mean that all forms of impact to the floor will be judged acceptable by people living in the space below, particularly regarding low frequency noises in timber constructions.

To report uncertainty, the document includes one decimal place precision for single-number quantities. However, single-number quantities to be used in relation to the NCC requirements are reported to integer precision.

This document is identical with, and has been reproduced from, ISO 717‑2:2020, Acoustics — Rating of sound insulation in buildings and of building elements — Part 2: Impact sound insulation.

As this document is reproduced from an International document, the following applies:

(a) Its number does not appear on each page of text and its identity is shown only on the cover and title page.
b) In the source text ‘this part of ISO 717’ should read ‘this document’.
(c) A full point substitutes for a comma when referring to a decimal marker.

Australian or Australian/New Zealand Standards that are identical adoptions of international normative references may be used interchangeably. Refer to the online catalogue for information on specific Standards.

The terms “normative” and “informative” are used in Standards to define the application of the appendices or annexes to which they apply. A “normative” appendix or annex is an integral part of a Standard, whereas an “informative” appendix or annex is only for information and guidance.