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Profiled metal roofing – swarf staining

  • Swarf (residual fragments of steel from cutting, drilling or grinding roofing sheets) have been left on the roofing or in gutters

    How to repair

Galvanised steel profiled metal roofing – white rust

  • The zinc coating has corroded when water is trapped between sheets at laps and joints. This may occur during roofing installation or during storage before installation

    How to repair

  • Insufficient rain washing. Rain washing tends to be less effective on roofs with less than 15 degrees slope

    How to repair

Galvanised steel profiled metal roofing – red rust

  • Erosion or scratching damage of the galvanising, exposing the steel

    How to repair

  • Roofing is in contact with, or has run-off from, cedar or redwood, or timber treated with a copper-based preservative treatment 

    How to repair

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Rust on zinc/aluminium or aluminium/zinc alloy-coated steel roofing

  • Erosion of or scratching damage to the zinc/aluminium or aluminium/zinc alloy coating, exposing the steel

    How to repair

  • Lack of rain washing. Rain washing tends to be less effective on roofs with less than 15 degrees slope

    How to repair

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Profiled metal roofing – corrosion at lapped ends

  • The underside (back surface) of the edges of sheets have not been primed and do not get cleaned

    How to repair

  • Water trapped in end laps 

    How to repair

Galvanised steel roofing – corrosion at roofing sheet ends

  • The underside (back surface) of the edges of sheets have not been primed and do not get cleaned

    How to repair

  • There is a moist corrosive environment, as water likely to remain in the gutter  

    How to repair

Painted profiled, steel roofing – paint damage

  • Paint damage from UV light exposure, temperature changes and atmospheric conditions. Cracking of paint occurs particularly on bends or folds. (Pre-painted roofing can be expected to last 15 years before the first major maintenance is required) 

    How to repair

Painted profiled, steel roofing – chalking of finish

  • Weathering – chalking will be more visible with darker colours

    How to repair

Painted profiled, steel roofing – fading

  • Weathering – darker colours are more prone to fading

    How to repair

Painted profiled, steel roofing – scratches

Rust on alloy-coated pre-finished steel roofing

  • Paint failure and subsequent erosion of or scratching damage to the zinc/aluminium or aluminium/zinc alloy coating, exposing the steel

    How to repair

  • Roofing material is in contact with or has run-off from cedar or redwood, or timber treated with a copper-based preservative treatment 

    How to repair

  • View all repairs

Corrosion of roofing downstream from copper vent

  • Dissimilar metal corrosion due to water flowing from copper vent onto an incompatible roofing metal 

    How to repair

  • Vent pipe not PVC sleeved

    How to repair