Check before painting a metal roof
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Check before painting a metal roof
Most people know about galvanic action, the corrosive effect that occurs when incompatible metals come into contact. But few people are aware of the damage to galvanised iron gutters and downpipes that can occur when an old roof is replaced with Zincalume, glazed tiles or painted metal sheeting. These materials, unlike roofing of galvanised steel, unglazed tiles or fibro, do not deposit metal salts and minerals as a protective coating on the inside of the gutter. Pure rainwater flowing from a chemically-inert roof may wash away the protective film on the inside of the galvanised guttering, causing rapid early gutter failure.
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