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Zinc
 A softish grey metal, used in three ways in church buildings:
1. in pure sheet form to make ridging for slate roofs, or as a roof covering in its own right.
2. In pure rolled sections, to make glazing bars for small-paned glazing.
3. As a coating - galvanising - for wrought-iron or steel, Typical applications are to coat 'corrugated iron', gates and railings and other exposed steelwork. Also used to coat slating nails. Zinc is more chemically reactive than the underlying iron or steel, so galvanising deters rusting.
Related Words Corrugated iron; Galvanised mesh; Steel; Wrought iron
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