Timber-concrete composite (TCC) floors offer an efficient solution for taller buildings by combining the advantages of timber and concrete. To optimise material use and reduce emissions, multi-span configurations could replace single-span beams. However, in practice, TCC slabs are still designed as simply supported. This study investigates the moment-rotation relation over the centre support of multi-span TCC slabs using experimental and numerical methods. Nine three-point bending tests were conducted, complemented by finite element modelling and a probabilistic component analysis. Results indicate that the structural configuration achieves significant rotational stiffness, which can be exploited to reduce material consumption and lower the carbon footprint of TCC construction. This is an extended abstract of a paper published in the Special Issue of the COST Action HELEN in the journal Wood Material Science & Engineering. The full open-access article is available at: https://doi.org/10.1080/17480272.2025.2509083