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Rust on zinc/aluminium or aluminium/zinc alloy-coated steel roofing
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Erosion of or scratching damage to the zinc/aluminium or aluminium/zinc alloy coating, exposing the steel
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Lack of rain washing. Rain washing tends to be less effective on roofs with less than 15 degrees slope
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Roofing metal is in contact with or has run-off from cedar or redwood, or timber treated with a copper-based preservative treatment
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Roofing has run-off from translucent (PVC) sheeting
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Corrosion of the steel in a corrosive environment such as near a swimming pool, or in coastal, industrial or geothermal regions
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Inadequately primed end and/or side laps
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Use of lead flashings
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The roofing is near the end of its serviceable life
Rust on alloy-coated pre-finished steel roofing
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Paint failure and subsequent erosion of or scratching damage to the zinc/aluminium or aluminium/zinc alloy coating, exposing the steel
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Roofing material is in contact with or has run-off from cedar or redwood, or timber treated with a copper-based preservative treatment
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The roofing has run-off from translucent (PVC) sheeting
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The roofing is near the end of its serviceable life
Zinc roofing – white surface corrosion
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Lack or rainwashing. Rain washing tends to be less effective on roofs with less than 15 degrees slope
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The roofing material is in contact with, or has run-off from, cedar or redwood, or timber treated with a copper-based preservative treatment
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The roofing has run-off from translucent (PVC) sheeting
Corrosion: red rust on galvanised mild steel cladding
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Galvanised coating has eroded to expose bare metal
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Profiled metal cladding is in contact with or has run-off from cedar or redwood, or timber treated with copper-based preservative treatment
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Galvanised mild steel cladding has run-off from translucent sheeting (PVC), glass, pre-painted roofing, glazed tiles, unpainted zinc/aluminium alloy-coated mild steel or aluminium
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Damage to the galvanised coating during fixing exposing steel
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Exposure to a corrosive environment such as a swimming pool, or in coastal, industrial or geothermal areas
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Inadequately primed end and/or side laps
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Cladding in ground contact
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Insufficient rain washing
Red rust on zinc/aluminium or aluminium/zinc alloy-coated steel
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Corrosion of the steel when zinc/aluminium alloy coating has eroded to expose the steel
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Cladding material in contact with or has run-off from cedar or redwood, or timber treated with a copper-based preservative treatment
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Cladding has run-off from translucent (PVC) sheeting
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Corrosion of the steel in a highly corrosive environment such as a swimming pool, or in coastal, industrial or geothermal regions
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For factory coated material, wrong coating specification for the in-use conditions
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Inadequately primed end and/or side laps
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Cladding in ground contact
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Insufficient rain washing
