If you would like to post a comment and need instructions click here. View the discussion thread. Skip to main content. You are here Home ». Article Author:. Peter Ball. Tuesday, October 27, - Linkedin Share Button Share on Facebook. Materials History. Australia is, without a doubt, the spiritual home of corrugated roofing. Corrugated roofing was invented by the British architect and engineer Henry Palmer , who worked for the London Dock Company. It was originally known as CGI, which stood for corrugated wrought iron.
In its earliest form, CGI exhibited strength, corrosion resistance and convenient transportation, all of which led to its desirability in the production of prefabricated structures by skilled workers.
Composed of sheets of hot-dipped galvanised iron, it was cold-rolled to produce a linear corrugated pattern — a series of alternating grooves and ridges for weather resistance and increased strength. The gold rush in Victoria was the major catalyst for this, demanding material that was speedy in its construction, flexible, lightweight, cheap and well-suited to the Australian environment. Used as roofing for verandahs and in the form of portable shops, it was soon used to make vast numbers of prefabricated dwellings to house colonial settlers, miners and other workers.
The tin roof corrugated iron did indeed play a strong role in the settling of Australia. As a material of the industrial and colonising age, it has been a crucial part of our frontier and mining adventures.
When galvanised corrugated iron first arrived in Australia in the s , the benefits were clear early on. It was easily and swiftly applied, light, compact, inexpensive, fireproof and immune from insect attack. Enough iron to cover the roof of a cottage fitted easily onto a dray or cart, making a load that was light enough to be dragged over bumpy roads to almost any bush building site.
The change went unnoticed by the general public, but today, with increased use of Zincalume an alloy of zinc and aluminium the old term is fading. While galvanised corrugated roofing has its benefits, one look at a building that used roofing sheets manufactured before will tell you that galvanised corrugated iron or steel rusts.
Corrugated roofing starts to degrade within a few years despite the protective action of the zinc coating and marine and salty environments speed up this process even more so because of the high electrical conductivity of seawater.
To get past this, changes have been made to steel production. Because of their toughness, corrugated metal roofs will resist adverse weather conditions more than many other materials.
If you live in an area that's more prone to thunderstorms or hail, you should consider installing these roofing materials as they can withstand storms better than asphalt shingles. Rust happens when the metal comes into contact with moisture in the air, causing a chemical reaction.
The longer the metal is exposed, the larger the corrosion will grow. Most corrugated iron is treated with corrosion protectant, or galvanised, which is a process of applying a protective zinc coating to steel or iron. In comparison to an ordinary roof covered with asphalt shingles, a corrugated metal roof can last up to three times as long as asphalt, or 25 to 60 years. How long a corrugated metal roof will last, is often determined by the thickness of the panel, and type of coating used.
Corrugated iron is one of the least expensive roofing products, but can cost more than zincalume and some types of Colorbond. Corrugated steel panels have been a popular roofing and siding choice for commercial and agricultural buildings for decades due to its strength and durability. Now, corrugated steel is commonly used in the residential sector as well and, in addition to roofing, it is also used as a siding option.
Standard lengths for corrugated roofing are 8, 10 and 12 feet. The width varies greatly, depending on the style of roofing. The width is measured simply straight across the top of the sheet , from edge to edge, to indicate the coverage width of the sheet.
Galvanizing with zinc to protect the base metal from rust was developed in France in By the s the material was used on post offices and customhouses, as well as on train sheds and factories. In one of the first metal roofs in the South was installed on the U. Mint in New Orleans. Types of Roofs in the s Wood Shingle Roofs.
For early American settlers, wood timber was an abundantly available resource that they could harvest readily with axes and saws. Slate Roofs. Unlike wood, slate is a highly durable, inflammable, rot- and insect-resistant material.
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