Rust
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Swimming pool – concrete wall cracking/deterioration
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Soil subsidence under/against pool
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Poor design or installation
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Changes in soil moisture or groundwater levels
Rust stains on concrete/concrete block foundation walls
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Poor quality concrete absorbing water that rusts the reinforcing, which in turns causes the concrete to spall or crack, allowing in more water
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The reinforcing was installed too close to the outer surface of the concrete
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The building is close to the sea and the concrete is of poorer quality
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The concrete is low strength
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Moisture is rising up from the ground
Rusting flashings and metal components
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Air-borne salt, dust or dirt accumulating under flashings and metal components
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Zinc (galvanizing) or aluminium/zinc or zinc/aluminiuim alloy coating has been scratched or eroded, exposing steel
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Acidic leachate from cedar or H4-treated timber (containing copper-based preservatives)
Rusty nail fixings on exterior walls
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Heads of fixings are not protected by putty where punched and stopped
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Incorrect fixing type used for environmental conditions, cladding type or finish
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Rust was not cleaned off fixings before re-stopping/repainting
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Inadequate paint finish to provide protection
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Acidic leachate from cedar or H4-treated timber (containing copper-based preservatives)
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Corrosion protection of fixings (such as zinc) was damaged during installation
Staining around nail holes in timber weatherboards
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Rust staining from mild steel or hot-dip galvanised nails
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Staining from hot-dip galvanised, copper or aluminium nails in cedar (typically a teardrop-shaped stain)
Plywood cladding – staining around nail holes
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Rust staining from mild steel or hot-dip galvanised nails
Rust spotting on texture-coated fibre-cement cladding
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Corrosion of fasteners where incorrect fasteners were used or the galvanised coating has been damaged during fixing
Rust spotting on asbestos-cement cladding
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Corrosion of fasteners where incorrect fastener used or galvanised coating has been damaged during fixing
Rust stains on stucco
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Hairline cracking in the stucco admitting moisture causing corrosion of the reinforcing mesh
Timber slat decks – rusty connectors/fixings/support brackets
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Exposure to air-borne salt, dust or dirt; trapped moisture and dirt
Steel deck beams – rusting
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Exposure to air-borne salt, dust or dirt; trapped moisture and dirt
Steel deck posts – rusting
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Inadequate corrosion treatment
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Severe sea spray/coastal environment
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Trapped moisture