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Zincalume® Steel for Walling
ZINCALUME® STEEL FOR WALLING
Technical Data :
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How To Select Steel Grade for Walling
Like steel roofing, the performance of steel walling can be influenced by a number of factors, including the environment. In the case of walling, the most important factor to be aware of is unwashed areas.
Unwashed Areas
Since walls are vertical surfaces, they can be sheltered from general rain washing, particularly towards the top of the wall, adjacent to overhanging eaves. In these regions, dust and dirt which would otherwise be washed away by rain, tends to build up. This leads to an increase in the time that the material surface is in contact with sufficient moisture to cause corrosion. When the build-up of dust and dirt includes marine salts, and/or other pollutants, unwashed area corrosion is further exacerbated.
Design
Modern building design often incorporates large overhanging eaves, verandahs and walkways in combination with walling made from COLORBOND® pre-painted steel. The designer should understand the responsibility inherent in the inclusion of such areas, and either minimise their extent, select the appropriate COLORBOND® steel product for the application or incorporate a stringent regular maintenance routine after construction.
Product Selection & Maintenance
The corrosion effects observed in unwashed areas can be minimised by regular washing with fresh clean water. Table 1 gives an indication of the required maintenance period, plus serves as a guide for selection of an appropriate walling product.
Table 1: Recommended CSA Product Guide for Roofing in Marine Environments
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| Severity |
Approximate Distance From Marine Influence |
Recommended Product |
| Very Severe |
<100m from breaking surf
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COLORBOND® Stainless steel |
| Severe |
100-200m from breaking surf
50-100m from calm still water*
(e.g. protected harbour)
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COLORBOND® Ultra steel |
| Severe |
200m - 400m from breaking surf; or
50 - 100m from calm still water (e.g. harbour)
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COLORBOND® XRW steel or ZINCALUME® steel |
| Moderate |
>400m from breaking surf
>100m from calm salt water (e.g. harbour)
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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
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Note:
- Absolute performance is subject to local conditions (eg 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 contact BlueScope Steel Direct for more information.
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