Subfloor
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Blocked ventilation openings in foundation walls
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The soil level has been built up, covering ventilation openings
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Paving covers or partly covers the ventilation openings
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Planting and foliage restrict air flow through ventilation openings
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There is an insufficient number or size of ventilation openings for the subfloor area
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There is a build up of paint on ventilation grilles reducing air flow
Rotted baseboards or subfloor cladding
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Soil or mulch has been built up against the timber
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Planting and foliage are restricting air flow and keeping the cladding damp
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The timber used was untreated
Cracked or damaged subfloor sheet cladding
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Building movement
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Earthquake
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Impact damage
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Sheets have become brittle with age
Stain failure at base of timber weatherboard walls
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Cladding covered by soil/foliage
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The back surface of boards is too close to the ground, not sealed and absorbing moisture
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Concrete has been placed up to and against cladding
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High subfloor moisture levels behind the cladding
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Bottom of cladding is too close to a waterproof deck surface, apron flashing and absorbing moisture
Plywood cladding – paint failure at base of walls
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Cladding covered by soil/foliage
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The back surface of boards too close to the ground, not sealed and absorbing moisture
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Concrete has been placed up to and against cladding
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High subfloor moisture levels behind the cladding
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Bottom of cladding too close to waterproof deck surface, apron flashing and absorbing moisture
Subfloor – damp soil
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Surface water flowing underneath the building if the subfloor ground level is lower than the ground or paving outside the building perimeter, or if the ground slopes towards the building instead of away from it
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High water table or natural spring
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Leaking drain or waste pipe in the subfloor space
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Inadequate subfloor ventilation due to blocked or no ventilation openings
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Subfloor airflow restricted by rubbish or items stored under the building
Subfloor – ponding water
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Surface water flowing underneath the building if the subfloor ground level is lower than the ground or paving outside building perimeter, or if the ground slopes towards the building instead of away from it
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Blocked or overflowing stormwater drain or gulley trap discharging water under the house
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Leaking drain or waste pipe in the subfloor space
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High water table so water does not readily drain away
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Water getting through a retaining wall
Subfloor – musty smells
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High subfloor moisture levels
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Rotten timber – piles, bearers, joists
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Items stored in the subfloor space are damp
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Presence of fungal growths
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