INTERLABORATORY DYNAMIC STIFFNESS MEASUREMENT OF EXPANDED POLYSTYRENE

As a framework of the research in the ETICS (external thermal composite insulation composite
system) influence on the sound insulation of walls, an apparent dynamic stiffness (s’t) interlaboratory
measurement was performed in accordance to the standard EN 29052-1 [1]. Measurements were
performed on samples of Expanded polystyrene (EPS), a closed cell material. Generally, three
excitation approaches (pulse- hammer hit; white noise and sine signal- shaker excitation) were used.
The significant differences in results were measured not just in comparison between laboratories but
also between measurement approaches. The differences up to 169% were found between results for
specific specimen.