CORTEN steel Wetting-drying cycle

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Designing in weathering steel is primarily concerned with ensuring the wetting-drying cycle, which forms the protective oxide layer, is allowed to happen. As in previous technical articles, the importance of detailing out pockets, crevices, upward-facing channels and so on cannot be over-emphasised. Where such a condition is unavoidable, say for structural reasons, then it is important to include drainage holes or to ensure sufficient ventilation. Anything that retains moisture should be discouraged, again preferably by design.

Leaves, moss and the proximity of trees can all affect the performance of the material adversely.

When viewed in conjunction with the intended environment, detailing can make the difference between success and failure of a weather-resisting steel structure. There are some environments where special care must be exercised.

First, atmospheres where there is a high concentration of industrial fumes.
Second, submerging, or burying in the ground. If this is unavoidable other methods of protection can be employed such as concrete encasement or cathodic protection.
Third, exposure to chloride ions, such as in a marine environment or close to a highway, where exposure to salt may pose a problem. Salt can affect the oxide layer because it is hygroscopic and will retain moisture.

Another detailing problem is that of runoff from the steel. It will be impossible, especially while the oxide layer is forming, to prevent the run off from staining susceptible materials unless the detailing of channels and the position of such materials is considered carefully.