| Sound insulation Contrary to acoustic regulation, which deals with sound within a room, sound insulation is about preventing sound from spreading to surrounding areas. Sound insulation can be measured from "room to room" or from "plenum to room" and is recorded in dB. Typically, for a reasonable degree of privacy, the minimum "room to room" sound insulation value between adjoining rooms e.g. cellular offices should be 35 dB.  Airborne sound insulation Airborne sound insulation can be expressed by the weighted sound reduction index Rw. Rw is determined by measurements at 1/3 octaves in the range 100 -3150 Hz. The measured values are compared to a reference curve, whereupon Rw is determined. In this way the sound insulation is expressed by only one figure instead of 16. Measurements on ceilings are normally completed in accordance with ISO 140/9. |
