Question: What is the difference between Galvanised and Galvalume?

Galvanised steel is a metal roofing material which has been manufactured with a coating of zinc within its makeup. The zinc inhibits the growth of rust, which is why its used as an anti-rust coating. Galvalume is also steel sheeting, made with a coating of a combination of both zinc, silicon and aluminium.

How can you tell the difference between Galvanised and Zincalume?

Galvanised steel is coated in almost pure zinc material, while Zincalume steel is coated in a combination of approximately 55% aluminium, 43.5% zinc and 1.5% silicon. Is Zincalume reflective? Unpainted Zincalume is considered a reflective material with a colour similar to off white Colorbond materials.

How much does a sheet of galvalume cost?

The cost for this grade is estimated at $70 per square, which is the same as 100 square feet in laymans terms. There are also higher grades of galvalume roofing that cost between $200 and $700 per square, which may be thicker, have a longer warranty or have other features such as a decorative stone coating.

Does Zincalume need to be painted?

Aged ZINCALUME® steel can also be painted. It should be cleaned, greasy deposits should be removed with a suitable solvent and any loose corrosion product removed by wire brushing. Painting can be undertaken as mentioned above.

Is galvalume painted?

Galvalume sheet has a bright, distinctive spangled appearance which is pleasing in its own right and has very good protective properties in the atmosphere. It can be painted if a painted appearance is desired with many of the paints which are recommended for galvanized sheet.

How do you prevent galvanic corrosion?

Galvanic corrosion can be prevented by:Selecting materials with similar corrosion potentials.Breaking the electrical connection by insulating the two metals from each other.Applying coatings to both materials. Separating the two materials by inserting a suitably sized spacer.

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