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How to select a steel grade for roofing: There are many factors governing the selection of the recommended grade of COLORBOND® steel to use. Atmospheric factors and the nature of the activity within the building are among the most important. Table 1 below serves as a guide for selection in marine environments. ZINCALUME® steel and COLORBOND® steel are also suitable for light industrial environments however where the product is subject to heavy fallout, acid, alkali laden air or other corrosive chemicals please contact BlueScope Steel Direct on 1 800 022 999 for advice on the recommended product and fasteners to use. This also applies to harsh service activities carried out within buildings such as intensive animal farming and indoor swimming pools. Table 1: Recommended CSA Product Guide for Roofing in Marine Environments Severity Approximate Distance From Marine Influence Recommended Product Very Severe <100m from breaking surf COLORBOND® Stainless steel Severe 100-200m from breaking surf 50-100m from calm still water* (e.g. protected harbour) COLORBOND® Ultra steel Severe 200m - 400m from breaking surf; or 50 - 100m from calm still water (e.g. harbour) COLORBOND® XRW steel or ZINCALUME® steel Moderate >400m from breaking surf >100m from calm salt water (e.g. harbour) COLORBOND® XRW steel or ZINCALUME® steel Benign > 1000m from breaking surf; or > 500m from calm still water (e.g. harbour) Benign COLORBOND® XRW steel, or ZINCALUME® steel Note: Absolute performance is subject to local conditions (e.g. prevailing winds) and unwashed areas (i.e. regions of the roof not naturally washed by rain). Above table applies to roofing product only. The above table applies to salt marine influences only. For installations subject to severe, heavy industrial conditions, it is essential to consult a BlueScope Sales Office for advice on the appropriate product. Please phone BlueScope Steel Direct on 1 800 022 999 for more information. Curved Roofs: COLORBOND® steel and ZINCALUME® steel is the smart roofing choice providing innovative options for curved roofs. From the traditional bullnose verandah to the soft sweeping curves of today's innovative designs, curved roofing made from COLORBOND® or ZINCALUME® steel is designed to make an impression that really lasts. Year after year, curved steel roofing regularly features in architectural award winning housing and commercial designs. The versatility of COLORBOND® and ZINCALUME® steel is renowned. By combining light weight with strength, steel provides excellent flexibility in maximising floor plan designs. Its clean uncluttered lines give building designers the means to create clearly defined and attractive structures. Over the last decade structures designed with curved roofing have developed a unique affinity with Australia's coastal and natural environment not only in complementing the look of the landscape but also in creating light, airy and spacious living environments for its inhabitants. Two options for Curved Roofs: Sprung Curved Roofing is the process of free forming the roof sheets over the contours of the roof frames, progressively fixing the individual sheets over the battens or purlins. The main advantage of sprung curved roofs is that standard corrugated steel sheets made from COLORBOND® and ZINCALUME® steel can be used - delivered to the building site in straight flat sheets. It is important to work within the curving range of the steel - a concave curve made from standard sheeting should have a radius no lower than 12 metres and a convex roof a radius of no lower than 10 metres. Factory pre-formed curved roofing is necessary for convex and concave curves which are tighter than what can be achieved with sprung curving. This is done by passing the sheets through sets of rollers until the desired curve is achieved. This process allows tight curves to be produced, such as those required for bullnosed verandahs and cranked ridging. Not surprisingly, individuality comes at a cost with some additional charges likely for the preforming process. Several steel roofing suppliers have produced comprehensive guides to installation of curved roofs covering various aspects of installation and design principles. There are also other steel roofing profiles, other than the standard corrugated shape, which have different curving abilities - steel roofing suppliers will also be able to assist in providing this information.

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