Fecha de publicación: -- Fuente: Materials This study evaluates eucalyptus bark fibres as sustainable reinforcement in light clay wall systems, addressing a significant research gap in bio-based construction materials. Despite eucalyptus bark being an abundant forestry by-product in Portugal, no prior research has examined its application in earthen composites. Light clay samples using eucalyptus bark and clay were prepared and then through comprehensive physical and mechanical characterization, it was demonstrated that the clay slip ratio caused density variations exceeding 200 kg/m3 (range: 870–1072 kg/m3). With an embodied energy of