Stains
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Swimming pool vinyl liner stained
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Pool chemicals, metals, leaves and organic debris
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
Staining of walls and/or eaves
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Insufficient cleaning
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Walls and eaves continuously damp due to heavy planting/overhanging trees/a bank in close proximity
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Localised water run-off across the face of the wall
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Lack of rain washing
Black staining on stained or clear-finished timber weatherboards
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Mould growth on timber surface; occurs most commonly on south-facing walls
Staining from run-off from cedar or H3.2 treated pine weatherboards
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Leachate from cedar weatherboards or treatment chemicals
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 stains on stucco
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Hairline cracking in the stucco admitting moisture causing corrosion of the reinforcing mesh
Verandas – water stains on soffit lining
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Rain blowing under the soffit/leaking roof above/overflowing gutters
Staining of uPVC door and window frames
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Run-off from the building
Stains on window and door glass
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Alkaline run-off from concrete, cement plaster or cement mortar
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Use of alkaline cleaners
Subfloor – damp stains on underside of flooring
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Leaking water or waste pipe
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Overflow or leak from wet area fixtures such as bath, shower, handbasin, dishwasher, clothes washer, hot water cylinder
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Inadequately waterproofed tiling in wet area such as no waterproofing membrane under tiles