Metal tile roofs – corrosion

Causes

Loss or breakdown of the stone chip coating or paint coating

Air-borne salt accumulating under tiles, particularly where tiles are damaged 

Erosion of the galvanising, zinc/aluminium or aluminium/zinc alloy coating, exposing the base metal

Roofing at the end of its serviceable life 

Listed under: finishes, metal, aluminium, zinc, paint, Roof, cladding, durability, corrosion, stone chips, roof cladding, metal tiles

Cause

Loss or breakdown of the stone chip coating or paint coating

Repair

  • if the roofing is within the warranty period, contact the manufacturer.
  • if the roofing is outside the warranty period, have the roof re-coated by a specialist applicator. 

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Cause

Air-borne salt accumulating under tiles, particularly where tiles are damaged 

Repair

  • if the roofing is within the warranty period, contact the manufacturer.
  • if the roofing is outside the warranty period, have the roof re-coated by a specialist applicator. 

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Cause

Erosion of the galvanising, zinc/aluminium or aluminium/zinc alloy coating, exposing the base metal

Repair

  • if the roofing is within the warranty period, contact the manufacturer.
  • if the roofing is outside the warranty period, have the roof re-coated by a specialist applicator. 

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Cause

Roofing at the end of its serviceable life 

Repair

  • reroof with new tiles. If the old tile roof has met minimum Building Code durability provisions (it has lasted at least 15 years) a building consent is not required; if not, a consent must be obtained before reroofing

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