Section of a rusty yet colourful corrugated sheet fence showing the fixing bolt and an attractive pattern
Corrugated galvanised iron (colloquially corrugated iron or pailing (in Caribbean English), commonly abbreviated CGI) is a building material composed of sheets of hot-dip galvanised mild steel, cold-rolled to produce a linear corrugated pattern in them. The corrugations increase the bending strength of the sheet in the direction perpendicular 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. Its unique properties were used in the development of countries like Australia from the 1840s, and it is still helping developing countries today. Although galvanising inhibits corrosion of the underlying steel, rusting will be inevitable, especially if the local rainfall is at all acidic in nature. So for example, corrugated iron sheet roofing will start to degrade within a few years despite the protective action of the zinc coating in corroding preferentially. Other environments which lower the lifetime of galvanised iron roofs and similar products includes marine locations, where the high electrical conductivity of sea water will encourage and increase the rate of attack. Nevertheless, corrugated steel roofs can last for many years if further protected by a paint layer
Size: 3450px × 5175px
Location: Piccadilly Manchester England
Photo credit: © John Hopkins / Alamy / Afripics
License: Licensed
Model Released: No
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