Floors
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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
Subfloor – deterioration of the underside of particleboard flooring
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The particleboard is too close to the ground
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The subfloor space is very damp
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There is a water leak from within the house
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There is a leak through wall cladding leak if the cladding is damaged
Subfloor – mould areas on underside of flooring
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Damp subfloor space and/or lack of ventilation
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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
Subfloor – timber decay
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Damp subfloor space, lack of ventilation
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Leaking water or waste pipe; overflowing or leaking from wet area fixtures such as bath, shower, handbasin, dishwasher, clothes washer, hot water cylinder
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Subfloor framing is too close to or in contact with the ground
Subfloor – no insulation
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Insulation was not a requirement when the house was built; insulation was required but never installed; the insulation has fallen out; the insulation has been blown out by wind
Subfloor – poorly installed insulation
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Insulation was incorrectly installed, with gaps and spaces, or has been damaged by tradespeople
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Wind damage
Pole foundations – water damage to underside of flooring
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Wind-blown rain where the underside of flooring is not adequately protected
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Leaks from a plumbing fixture or pipe
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A cladding leak, particularly where a deck is attached to building
Interior musty smells
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There is a high level of moisture in the rooms due to a combination of poor ventilation, not enough heating, and/or poor insulation
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Dampness from the subfloor is getting into the rooms through gaps in the flooring and through service holes cut in framing
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Mould is present on surfaces and fabrics
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High levels of roof space moisture are lifting moisture levels in the rooms
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There are wall or roof leaks
House is draughty
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House built before 1970 and with older timber windows
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Open fireplaces
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Gaps in floorboards
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Wind flow through external walls
Tiling around showers, baths – sign of water leaks
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Leaking in-wall plumbing fittings or pipework
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No waterproof membrane behind the tiles
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Damaged tiles or grout
Timber floorboards, particleboard or plywood springy
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Span is too great for the size of joists, bearers or flooring
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Joists are cracked or broken
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Floor has been regularly sanded which has reduced thickness
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Water damage to flooring or subfloor framing
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Rotted piles
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Borer damage
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Inadequately supported piles
Timber floorboards, particleboard or plywood squeaking
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Timber floor structure and flooring have dried and shrunk
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Inadequate nailing of particleboard sheets
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Deflection – the span is too great for flooring thickness