AS ISO 717.1:2024 identically adopts ISO 717 1:2020, which provides a method whereby the frequency dependent values of airborne 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
Acoustics – Laboratory and field measurement of flanking transmission for airborne, impact and building service equipment sound between adjoining rooms – Part 2: Application to Type B elements when the junction has a small influence