Sound Insulation is a technique used to stop sounds transmission from one room to another. The main reason for this technique is that it ensures privacy within the room, cabin, studio, cinema, home theatres, conference rooms, auditoriums, sports auditoriums, halls etc. Sound insulation is required to stop the sound going out from the said premise or the area as the excessive sound going out could disturb the surrounding atmosphere. Like sound absorption, there are two main rating methods.
(a) STC (Sound Transmission Class) : As per American Standards which is used across the world, majorly within United States, STC is the capacity of any product to block the sound. It is a single number rating and measured in Decibels (dB).
(b) RW (Sound Reduction Index) : It is majorly used outside the United States and is a part of ISO standards. It is again similar to STC and it is a single number rating measured in Decibels (dB).