Roof
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Profiled metal roofing dented or damaged
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Sheets were damaged during installation
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Impact from overhanging branches
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Walking on unsupported parts of the roof
Profiled metal roofing buckling or twisting
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Inadequate allowance for thermal movement at fixings – this occurs more commonly with dark coloured and aluminium roofs
Profiled metal roofing tearing at fixing points
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The use of rivets instead of screws does not allow thermal movement to occur
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Fixing holes are too small to allow sufficient thermal movement
Profiled metal roofing – insufficient cover at sheet laps
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Poor installation
Profiled metal roofing – rainwater runoff not draining into gutter
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Roofing stops short of gutter
Surface pitting of profiled metal aluminium roofing
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The environment is corrosive (near the coast or industrial areas)
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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.
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Bird droppings are not washed off by rain
Profiled metal roofing – staining
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Run-off from lead flashings
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Soot or particulate emissions from nearby chimneys or flues
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Discharge onto the roof from a copper pipe, such as that from a hot water cylinder vent or from a pressure relief valve, or from copper piping in solar panels or air conditioning units
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Staining may be evidence of corrosion
Profiled metal roofing – scratches
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Careless walking on the roof
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Overhanging branches
Profiled metal roofing – swarf staining
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Swarf (residual fragments of steel from cutting, drilling or grinding roofing sheets) have been left on the roofing or in gutters
Profiled metal roofing – lead-head nails damaged or missing
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The lead heads were damaged during roofing installation
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Nails have worked loose over time as a result of movement in the roof
Galvanised steel profiled metal roofing – white rust
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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
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Insufficient rain washing. Rain washing tends to be less effective on roofs with less than 15 degrees slope