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Industrialized Building Sysem (IBS) is a new method of prefabrication construction, where components like walls, beams, floors, and other structural elements are built in a factory or other controlled setting and transported to the construction site for assembly. In IBS, composite materials are often used in structural components such as beams and columns because of their light and strong capabilities. However, the main challenge is the potential for local buckling of the Light Gauge Steel frame and C-Channel, which can occur due to uneven load distribution between the composite materials. The main objective of this study is to identify the flexural strength of composite beam prism and compare the performance of materials used to improve structural efficiency in construction. The study methodology includes sample preparation and laboratory tests, such as three-point bending tests, compressive strength tests, and water absorption. The results show that certain material combinations, such as light gauge steel frames with lightweight concrete lecaball, provide the highest flexural strength by increasing the flexural performance of the composite prism beam by 72% compared to the combination of C channel and normal concrete, which increased the flexural performance by 55%. This study is expected to contribute to developing more efficient, safe, and sustainable construction technology, especially in IBS applications in Malaysia. In addition, based on the test results, lightweight concrete lecaball shows very high performance and has the potential to be used as an infill material in composite beams and sandwich wall panels. At the same time, it can also reduce noise transfer between the hollow parts of the beam composite or sandwich wall panel. This will make the sandwich wall panel more noise-insulated.