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With the increasing use of wood also for multi-storey dwellings, a wide variety of timber construction systems have been developed in Austria, of which in particular timber post and beam construction and solid timber construction in cross-laminated timber have become established. During the Internoise 2005, the first session on sound insulation in timber construction was initiated by Jean-Luc Kouyoumji. At that time, I was able to present first examples of multi-storey CLT dwellings in Austria. Today buiding with wood is a worldwide topic and there are still a lot of research questions, especially in the low-frequency range, in flanking transmission and optimization. Within the Sound.Wood.Austria research project, acoustic laboratory measurements of typical Austrian wood based building components were carried out in order to determine the effect of various design measures on sound insulation in a systematic approach and to identify possible optimization potential. Exterior and apartment partition walls as well as apartment partition ceilings were investigated. In this talk, selected measurement results will be presented and discussed. The results stress the fact, that further research work and developments, preferably internationally networked, are desirable in order to exploit the acoustic potential of timber buildings in the sense of "Green Deal".

The sound transmission between adjacent rooms can be dominated by the structure-borne sound transmission in the flanking walls. A wall can be defined as a subsystem of the overall system based on two coupled rooms. These subsystems show local modes, if they are not connected to each other. In contrast, connected subsystems result in global modes showing a high response of both subsystems, if the comparable local modes have similar eigenfrequencies. The flanking sound transmission especially at low frequencies is reduced, if a generation of such global modes can be suppressed. As a consequence, the flanking sound transmission in buildings can be mitigated significantly using a proper design of the walls (geometry, material, etc.). The principles and the impact of this effect are studied in this paper using numerical models based on the finite element method. Selected constructions are implemented in real size 2D- and 3D-models of two adjacent rooms. Panels of cross-laminated-timber are used because the variable composition of the single layers of a panel allows an extensive variation of the vibration response of the single walls. The results confirm the applicability of the described effect for common practical situations.

Historic roof structures made of timber in Graz -methodology for site evaluationThis contribution deals with the influences of time and those relevant to bearing capacity on the reliability of historic timber roof structures. Furthermore the evaluation as well as damage analysis of historic roof structures are discussed. Based on this an easily comprehensible and documentable methodology temporarily only for roof structures in the area of Graz is presented and illustrated with examples.

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