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Profiled metal roofing buckling or twisting

  • Inadequate allowance for thermal movement at fixings – this occurs more commonly with dark coloured and aluminium roofs

    How to repair

Profiled metal roofing tearing at fixing points

  • The use of rivets instead of screws does not allow thermal movement to occur

    How to repair

  • Fixing holes are too small to allow sufficient thermal movement

    How to repair

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

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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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Profiled metal roofing – scratches

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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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