Measurement uncertainty of façade sound insulation: A comparison between ANOVA and RRT uncertainty evaluations

In recent years the attention given to the measurements in the low frequency range has considerably increased, as well as their uncertainty evaluation; nevertheless, the uncertainty of field measurements, in particular façade sound insulation, has not been comprehensively investigated. ISO 12999-1 gives the uncertainty for airborne and impact sound insulation. This specific standard, however, is inaccurate as far as the façade sound insulation is concerned, because its uncertainty is considered equal to the airborne sound insulation uncertainty; indeed, the façade sound insulation measurement method is extremely different from the airborne sound insulation measurement method for partition walls and floors. This study analysed the uncertainty of the measurement method of façade sound insulation for field measurements, with the global loudspeaker method. The uncertainty evaluations were analysed using both advanced analysis of variance (ANOVA) techniques and Round Robin Test (RRT) uncertainty evaluation. Also, a comparison between these two uncertainty evaluation methods was done.