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Effect of moisture on the sound insulation of building components

: Hermes, Marcus; Mehra, Schew-Ram; Weber, Lutz; Künzel, Hartwig M.

Hauser, Gerd (Ed.); Lützkendorf, Thomas (Ed.); Essig, Natalie (Ed.) ; TU München; Karlsruhe Institute of Technology -KIT-; Fraunhofer-Institut für Bauphysik -IBP-, Stuttgart:
Implementing sustainability - barriers and chances. Book of full papers : April 24 - 26, 2013; SB 13 Munich
Stuttgart: Fraunhofer IRB Verlag, 2013
ISBN: 978-3-8167-8982-6 (E-Book)
Sustainable Building Conference (SB) <2013, Munich>
Conference Paper
Fraunhofer IBP ()

Water is an essential part in the production and application of building materials. Several years may pass until construction moisture dries out and the building components achieve moisture equilibrium. This paper investigates the influence of water contents in walls on the sound insulation properties. Therefore, monolithic walls made of different materials with variable moisture levels were systematically measured. The results clearly showed: The higher the moisture content, the higher the sound insulation. However, the effect of moisture on sound insulation cannot be explained by the increase of mass due to the additional water content alone. Thus further acoustic parameters like the loss factor or the module of elasticity were determined in dependence of moisture. Furthermore the change in water content of several walls was calculated by transient hygrothermal simulation for a period of several years. By coupling the calculation results with the acoustic measurement data the seasonal variation of the sound reduction index of walls could be determined.