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173:-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, Argentina, Spain, New Zealand and Australia and later India, and in Australia and Argentina also became (and remains) a common roofing material even in urban areas. In Australia and New Zealand particularly it has become part of the cultural identity, and fashionable architectural use has become common. CGI is also widely used as building material in African slums and informal settlements.
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The corrugations are described in terms of pitch (the distance between two crests) and depth (the height from the top of a crest to the bottom of a trough). It is important for the pitch and depth to be quite uniform, in order for the sheets to be easily stackable for transport, and to overlap neatly
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to produce a linear ridged pattern in them. Although it is still popularly called "iron" in the UK, the material used is actually steel (which is iron alloyed with carbon for strength, commonly 0.3% carbon), and only the surviving vintage sheets may actually be made up of 100% iron. The corrugations
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that form the corrugation. After the sheet metal passes through the rollers it is automatically sheared off at a desired length. The traditional shape of corrugated material is the round wavy style, but different dies form a variety of shapes and sizes. Industrial buildings are often built with and
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For roofing purposes, the sheets are laid somewhat like tiles, with a lateral overlap of one and half corrugations, and a vertical overlap of about 150 millimetres (5.9 in), to provide for waterproofing. CGI is also a common construction material for industrial buildings throughout the world.
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inhibits the corrosion of steel, rusting is inevitable, especially in marine areas–where the salt water encourages rust–and areas where the local rainfall is acidic. Corroded corrugated steel roofs can nevertheless last for many years, particularly if the sheets are protected by a layer of
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It was once common for CGI used for vertical walls to have a shorter pitch and depth than roofing CGI. This shorter pitched material was sometimes called "rippled" instead of "corrugated". However nowadays, nearly all CGI produced has the same pitch of 3 inches (76 mm).
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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 such as
Australia from the 1840s, and it is still helping
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increase the bending strength of the sheet in the direction perpendicular to the corrugations, but not parallel to them, because the steel must be stretched to bend perpendicular to the corrugations. Normally each sheet is manufactured longer in its strong direction.
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from around the 1890s, and iron CGI is no longer obtainable, but the common name has not been changed. Galvanised sheets with simple corrugations are also being gradually displaced by 55% Al-Zn coated steel or
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Typical corrugated galvanised iron appearance, with visible large flake type patterns. The galvanised sheet is viewed from below and is supported by a piece of angle iron (painted white).
228:), aluminium and copper. Regular ferrous alloys are the most common due to price and availability. Common sizes of corrugated material can range from a very thin 30
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161:, architect and engineer to the London Dock Company, was granted a patent in 1829 for "indented or corrugated metallic sheets". It was originally made from
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201:. This modern process is highly automated to achieve high productivity and low costs associated with labour. In the corrugation process
232:(0.012 inches, 0.3 mm) to a relatively thick 6 gauge (0.1943 inches, 5 mm). Thicker or thinner gauges may also be produced.
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239:-reinforced plastic sheets are also produced with corrugations. Clear or translucent products can allow light to penetrate below.
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when joining two sheets. Pitches have ranged from 25 mm (1 inch) to 125 mm (5 inches).
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Many materials today undergo the corrugation process. The most common materials for corrugated iron are
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476:"Architects' Notes: The Differences Between Galvalume And Galvanized In Metal Roofing Projects"
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Contemporary use of corrugated galvanised iron in architecture (Australia)
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A design of corrugated galvanised steel sheets "Proster 21", used as
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Today the corrugation process is carried out using the process of
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Wrinkly Tin: The Story of
Corrugated Iron in New Zealand
142:Early manual corrugated iron roller. On display at
189:sheets with complex profiles. CGI remains common.
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205:is pulled off huge rolls and through rolling
409:. Property.timesonline.co.uk. Archived from
235:Other materials such as thermoplastic and
180:Wrought iron CGI was gradually replaced by
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36:Corrugated galvanised iron roofing in
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407:"The Times & The Sunday Times"
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254:van with body made of iron sheet.
169:. It proved to be light, strong,
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478:. Englert, Inc. 15 January 2013
38:Mount Lawley, Western Australia
29:Type of metal building material
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47:A corrugated iron church (or
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98:(in Cyprus and Nigeria) or
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262:A stack of new iron sheets
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68:Corrugated galvanised iron
74:) or steel, colloquially
432:Thomson, Stuart (2005).
90:(in Caribbean English),
212:trapezoidal sheet metal
146:museum, South Australia
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110:composed of sheets of
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498:"Corrugation process"
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159:Henry Robinson Palmer
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536:Building materials
436:. Steele Roberts.
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112:hot-dip galvanised
106:(Australia), is a
78:(near universal),
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546:Roofing materials
464:on 16 April 2010.
381:"Corrugated iron"
341:Theorema Egregium
193:Corrugation today
108:building material
16:(Redirected from
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387:on 25 May 2010
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502:. Retrieved
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480:. Retrieved
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82:(taken from
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541:Corrugation
417:26 December
336:Quonset hut
304:galvanising
210:covered by
203:sheet metal
119:cold-rolled
104:corro sheet
84:UK military
80:wriggly tin
525:Categories
482:24 January
353:References
331:Nissen hut
326:Metal roof
252:Citroën HY
237:fiberglass
182:mild steel
115:mild steel
100:custom orb
302:Although
290:Corrosion
171:corrosion
315:See also
276:formwork
167:puddling
86:slang),
55:, London
504:14 June
391:1 March
219:ferrous
144:Kapunda
134:History
130:today.
88:pailing
53:Kilburn
531:Steels
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224:(e.g.
222:alloys
309:paint
230:gauge
51:) in
506:2022
484:2019
438:ISBN
419:2019
393:2010
207:dies
96:zinc
72:CGI
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