Cost, manufacturing parameters, durability, and appearance are the main things that determine whether a material is a good cladding choice of not.
Steel and aluminum are the most common materials used for cladding. Stainless steel and weathering steels are used at times. Other materials are used in particular circumstances which includes copper, bronze, and titanium.
Steel and aluminum are the most popular cladding materials. In the classifications of metal cladding types, these two are extensively used. Strength, durability, and cost of materials define the basic difference between steel and aluminum.
Before panel manufacturing steel cladding, they are first pre-galvanized and pre-painted in coil form. When steel is galvanized it produces a hard, durable outer layer since it is first dipped in molten zinc or zinc aluminum alloy, then bonded with metallic coating. The thickness of galvanized steel varies and this is expressed as the weight of zinc or zinc aluminum per square meter on both sides of the sheet. 275g/m2 and 255g/m2 are the coating weights for zinc and zinc aluminum coating, respectively. IN polluted or coastal environment, the zinc aluminum alloy has better durability. It improves corrosion performance on premium pre-finished metals. In order to improve appearance and durability the steel is coated with a variety of finishes. The premium coating is a tough and durable coating. It is usually the case that difficult environmental conditions exist outside of the sheets. And, the underside of the sheet can be subject to condensation and trapped moisture so there is a need to apply coating to this face at various specifications to suit both cost and environmental conditions.
Aluminum is resistant to corrosion. When bare aluminum reacts with oxygen, it results in a hard, dense layer that prevents corrosion. An aluminum alloy is formed by combining it with magnesium and manganese to form cladding aluminum. For improved durability, add an organic or metal coating to aluminum.
The relative merits of both steel and aluminum is difficult to compare. This often depends on the particular circumstances. With aluminum cladding you resist corrosion, but with painted steel cladding, you will have something durable. While aluminum is lighter, steel is stronger so profiles have to be deeper or thicker to span the same distances between purlins.
Aluminum is actually more expensive than steel because when it is produced, greater quantities of energy is required than what is required with steel. Steel resists impact more than aluminum so when there are temperature changes, steel move less than aluminum. It performs better in fire because it has a higher melting point. Aluminum has a low melting point which allows certain types of panels to be formed more easily than steel.