Corrugated galvanised iron, commonly abbreviated CGI, is a building material composed of sheets of hot-dip galvanised mild steel cold-rolled to have a linear corrugated pattern in them. The corrugations increase the bending strength of the sheet in the direction parallel to the corrugations, but not across them. Normally each sheet is manufactured longest 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.
CGI was invented in the 1840s, and was originally made (as the name suggests) from wrought iron. It proved to be light, strong, corrosion-resistant, and easily transported, and particularly lent itself to prefabricated structures and improvisation by semi-skilled workers. It soon became a common construction material in rural areas in the United States and Australia and later India, and in Australia also became (and remains) the most common roofing material and is even used in urban areas (in which application it is usually painted) but not as commonly as in rural areas. http://en.wikipedia.org/wiki/Corrugated_ironCorrugated galvanised iron, commonly abbreviated CGI, is a building material composed of sheets of hot-dip galvanised mild steel cold-rolled...all »Corrugated galvanised iron, commonly abbreviated CGI, is a building material composed of sheets of hot-dip galvanised mild steel cold-rolled to have a linear corrugated pattern in them. The corrugations increase the bending strength of the sheet in the direction parallel to the corrugations, but not across them. Normally each sheet is manufactured longest 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.
CGI was invented in the 1840s, and was originally made (as the name suggests) from wrought iron. It proved to be light, strong, corrosion-resistant, and easily transported, and particularly lent itself to prefabricated structures and improvisation by semi-skilled workers. It soon became a common construction material in rural areas in the United States and Australia and later India, and in Australia also became (and remains) the most common roofing material and is even used in urban areas (in which application it is usually painted) but not as commonly as in rural areas. http://en.wikipedia.org/wiki/Corrugated_iron«
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