Heritage maintenance: Corrugated roofing

The common term ‘corrugated galvanised iron’ is used to describe two different materials: galvanised wrought iron and galvanised mild steel. Until very late in the 19th century all corrugated galvanised iron was made from wrought iron, but from 1890 to 1910 improved methods of steel making and processing led to the complete replacement of wrought iron by mild steel. 

Although wrought iron is no longer available in sheet form, examples of galvanised wrought iron roofing have survived in Australia. As well as the corrugated form, other types include the pressed metal tiles by Morewood and Rogers in the second half of the 19th century.