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Corrugated galvanized iron or steel is a building material composed of sheets of hot-dip galvanized mild steel, cold-rolled to produce a linear corrugated pattern in them. The corrugations increase the bending strength of the sheet in the<!--I--> direction perpendicular to the corrugations, but not parallel to them.
Normally each sheet is manufactured longer in its strong direction. CGI is lightweight and easily transported.
It was and still is widely used especially in rural and military buildings such as sheds and water tanks. Its unique properties were used in the development of countries and it is still helping developing countries today.