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Surface pitting of profiled metal aluminium roofing

  • The environment is corrosive (near the coast or industrial areas)

    How to repair

  • Surfaces (including the exposed underside of the roof at the eaves) are not effectively washed by rain. Rain washing tends to be less effective on roofs with less than 15 degrees slope.

    How to repair

  • View all repairs

Profiled metal roofing – staining

  • Run-off from lead flashings

    How to repair

  • Soot or particulate emissions from nearby chimneys or flues

    How to repair

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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

  • View all repairs

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

Loose fixings on solar water heater