Fly ash is employed in many different applications and is generated in thermal power stations by burning lignite and coal. It is kept in rooms or stock over productive land. Power plants should use fly ash as soon as possible since it includes sulphur, and the area where it is stored will become arid. To utilize and recycle fly ash with the best results—which is required for creating bricks—research was conducted to determine the percentage of maximum usage combination of a fly ash building brick. The brick size specimen is 230 mm x 100 mm x 90 mm in dimension. According to Indian standards, several combination percentages of fly ash (9 to 21%), gypsum (6%), cement (28-38%), glass powder (3%-9%), glass fiber (1cm-3cm) and coarse aggregate (26-54%) with three distinct coarse-aggregate particle sizes (450 nm, 650 nm, and 850 nm), glass powder size (50 nm, 100 nm, and 150 nm) were tested for various mix proportions. The test findings demonstrate differences in compressive strength, water absorption, and efflorescence for various mixing proportions of the materials described previously during various curing times, which are 9 days, 18 days, and 27 days. The prior research-based findings plainly anticipated that the best mixing proportion of Fly-Ash 9-10%, Cement 28-35%, Gypsum-6%, glass powder 3%-9%, glass fiber 1cm-3cm and CoarseAggregate dust 26-52% would yield the highest possible compressive-tensile strength.