scope:

Specifies two series of methods, (element methods and global methods) for measurement of the airborne sound insulation of façade elements and whole façades respectively. The element methods aim to estimate the sound reduction index of a façade element, for example a window. The most accurate element method uses a loudspeaker as an artificial sound source. Other, less accurate, element methods use available traffic noise. The global methods, on the other hand, aim to estimate the outdoor/indoor sound level difference under actual traffic conditions. The most accurate global methods use the actual traffic as sound source. In addition a loudspeaker may be used as an artificial sound source.