Materials for cladding are chosen for their cost, manufacturing parameters, durability and appearance.
The most commonly used materials are steel and aluminium. Stainless steel and weathering steels are also reasonably available. In particular circumstances other materials such as copper, bronze and titanium have also been used.
Steel and aluminium are used extensively in all of the three classifications of metal cladding types. The principal differences between the two lie in the strength, durability and cost of each material.
Steel used in cladding is normally pre-galvanised and pre-painted in coil form prior to panel manufacture. During the galvanising process the steel is dipped into molten zinc or zinc-aluminium alloy (55% aluminium and 45% zinc) and a layer of the metallic coating is bonded to form a hard, durable outer layer. The thickness can be varied and is usually expressed as the weight of zinc or zinc-aluminium per square metre of on both sides of the sheet. Typically the minimum coating weight on cladding is panels is 275g/m2 for zinc and 255g/m2 for zinc-aluminium. The zinc-aluminium alloy (Galvalloy) has slightly better durability in polluted or coastal environments and improves "cut edge" corrosion performance on premium pre-finished metals like HPS200 by Corus.
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