Research and development at CBS-CBT for acoustically high performing timber-floor-system

The horizontal timber structure like slabs has been much improved by searching in the massive timber panel direction. By using single finger-jointed boards, the O'portune design allows free span from 6m to 11m for usual live loads. From the mechanical point of view, this massive panel concept is working like a diaphragm for seismic loads and can be fire wall for 60min to 120min. From the physical point of view, the internal acoustical comfort characterized by the Sabin coefficient, s is automatically reaching: 0.3 < s < 0.6 in function of the frequency. Both the transmission aerial acoustic and the impact acoustic behavior are improved by using a floating 50mm concrete layer on the timber slab. For higher free span from 10m to 16m, this O'portune design can be coupled to a concrete compression slab including a special steel plate for the mixed connection. In that case, all the performances are positively improved.