Corrugated Steel
Armco South Africa
Corrugated galvanised iron (CGI) or corrugated steel is a building material composed of sheets of hot-dip galvanised mild steel that are cold-rolled to produce 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. Corrugated steel is lightweight and easily transported. It was and still is widely used especially in rural and military buildings such as sheds, water tanks and even houses. Its unique properties were used in the development of countries like Australia and South Africa from the 1840s, and it is still helping developing countries today.
Henry Palmer, an architect and engineer to the London Dock Company, invented CGI in Britain in the 1820s. It was originally made from wrought iron. It proved to be light, strong, corrosion-resistant, and easily transported, and particularly it lent itself to prefabricated structures and improvisation by semi-skilled workers. Corrugated steel soon became a common construction material in rural areas in the United States, Chile, South Africa and Australia and later in India. It is still commonly used in some of these countries, particularly in rural areas. For roofing purposes, the sheets are laid somewhat like tiles, with a lateral overlap of two or three corrugations, and a vertical overlap of about 150 mm, to provide for waterproofing. Corrugated steel is also a common construction material for industrial buildings throughout the world. Wrought iron CGI was gradually replaced by mild steel from around the 1890s, and iron CGI is no longer obtainable - however, the common name has not been changed.
Armco Superlite South Africa
www.armco.co.za
Call: 011 974 8511
or 011 974 8511
Email: mail@armco.co.za
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