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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

Insecure flue

TV aerial is insecure

Header tank not seismically braced or strapped

Header tank tie downs corroded

  • Air-borne salt, dust or dirt accumulating on tie downs or straps

    How to repair

Roof space – rusty fixings

Steel gutters – rusting

  • There is insufficient fall to drain water 

    How to repair

  • There are leaves or other debris in the gutter, or weeds growing, retaining moisture and preventing water from draining away 

    How to repair

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Steel internal gutters – corrosion (rusting)

  • Water doesn't drain away

    How to repair

  • Leaves or other debris retain moisture and prevent water from draining away

    How to repair

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