Repeatability and reproducibility of field measurements in buildings

A RRT of sound insulation field measurements of building elements was carried out as part of a research sponsored by the Lombardy Region. The parameters which were evaluated include R, L and, in particular, the airborne sound insulation of the façade (D) which has not been sufficiently investigated so far. The data analysis performed on the basis of current technical standards relating to the measurement accuracy, consists of the scrutiny of results for consistency and outliers through two different approaches: a graphical consistency technique and the numerical outlier tests. The results of repeatability and reproducibility obtained and reported in this work have been assigned to the measurement's method of the different quantities examined. The critical analysis of these results allowed to highlight differences and concordances with the literature data available so far, in relation to the different structures investigated.