## 5 Conclusions  
This study investigated the development and characterisation of a novel plaster-based layered composite incorporating recycled glass wool (RGW) and perlite. A series of mechanical and physical tests were conducted to evaluate the material's performance. The obtained results were then analysed and compared with the relevant literature. * Perlite addition significantly enhanced the investigated physical and mechanical properties. This demonstrates its effectiveness as a lightweight filler for plaster-based materials without compromising performance. Furthermore, perlite's ease of acquisition and minimal pre-use treatment make it an ideal choice for this application. * Recycled glass wool (RGW) improved the composite's bulk density, flexural strength, and thermal conductivity. Notably, the RGW exhibited no degradation after its initial service life, demonstrating its suitability and effectiveness for this application. * The newly designed manufacturing system facilitated reduced production times, enhanced material homogeneity, and greater versatility in producing samples of varying sizes. Large-scale implementation of this system would translate to ease of production, potentially leading to significant business opportunities when combined with raw material cost savings. * Four composite formulations were evaluated. As all the formulations, except E-0.7-P-1 LU, satisfied the EN 14246 requirements for ceilings, all the formulations can be employed in the construction of partition walls when reinforced with cardboard. The E-0.7-P-2L sample exhibited the most significant improvement across all the investigated properties, while E-0.7-1 LU displayed the least improvement. Figure 7: The apparent density over maximum load value results compared. [49]: Sheep wool; [50]: groundnut and coir; [51]: Typha Angustifolia; [52]: Microencapsulated PCM; [53]: Cork; [54]: Chicken feathers; [55]: Plastic cables; [56]: Mineral wool; [57]: Cellular glass. Own elaboration. * Regarding flexural performance, all the composite samples demonstrated improved flexural resistance exceeding the minimum regulatory requirements. RGW played a critical role in significantly enhancing flexural strength across all samples, with perlite contributing an additional 10% increase. * The conducted cost analysis revealed a potential reduction in the final material cost compared to conventional ceilings. Even a minor reduction in plaster usage significantly impacted the purchase price per sample. The E-0.7-P-2L formulation achieved the most substantial cost savings, reaching up to 49% on the final product price. * This study demonstrated a potential reduction in embodied carbon emissions of up to 33% in the E-0.7-P-2L sample. Plaster has a high embodied carbon footprint, limiting the sustainability of this versatile material. The analysis results confirm a significant improvement in embodied carbon values, promoting a more sustainable construction approach aligned with sustainable development goals. This study was conducted regarding the application of the aforementioned material in ceiling elaboration. Within this context, some properties could be assessed to fully characterise this material. Complementary to that, X-ray diffractometry as well as SEM could also be performed for a better understanding of this material's behaviour. Conceptualisation, M.A. and D.F. ; methodology, M.A. and P.G.-M.; software, D.F. ; validation, M.A. and P.G.-M.; formal analysis, M.A. and D.F. ; investigation, M.A. and P.G.-M.; resources, D.F. and C.M. ; data curation, M.A. and D.F. ; writing--original draft preparation, M.A. and P.G.-M.; writing--review and editing, M.A. and D.F. ; visualisation, D.F. and C.M. ; supervision, D.F. and C.M. ; project administration, C.M. ; funding acquisition, C.M. All authors have read and agreed to the published version of the manuscript. The raw data supporting the conclusions of this article will be made available by the authors on request.