Pre-Painted GI monoblock / modular solid partitioning walls are fabricated by way of nominal 2×0.60 mm pre-coated GI sheets. These sheets are bonded with an infill of PUF and Rockwool, forming a rigid 50/80/100 mm thick panel to modular width of 1000 mm and 3000 mm in height. Pre-Painted GI modular walls and ceilings are suitable for makeing clean rooms for various industries like; electronics,food, healthcare, packaging, cosmetics etc.