Corrugated iron is a versatile material that was traditionally used for roofing and walling, as well as prefabricated buildings, particularly in rural areas. All metals corrode, so the main aim with a corrugated iron roof is to slow down the corrosion process. The corrugated iron features regular curved peaks and troughs, with an area of flat edging, or 'weatherboard' or stepped corrugations, and small, wide-spaced ribbed corrugations. It is available in a 10' size.