Drains
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Swimming pool – drains overflowing
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Blocked drains
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 – 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 – 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
Moisture entry through retaining foundation walls
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Ground moisture has moved through a retaining wall as it is unlikely the wall will have been waterproofed, and there is: no perforated drainage pipe at the base of the wall for ground water removal no drainage gravel above the drain, resulting in the drainage pipe becoming blocked with silt no filter fabric between drainage gravel and the drain, resulting in the drainage pipe becoming blocked with silt the drainage behind the wall has stopped working due to the pipe being blocked or the drainage gravel becoming filled with fine soil material
Moisture entry through basement walls
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Ground moisture, seen as efflorescence, staining or coating/surface damage on the inside face of a basement wall, moves through the wall from outside
Waste outlets not draining properly
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Build-up of soap, hair, grease in waste trap causing blockage
Overflowing gully trap
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Downpipe discharging rainwater into gully trap, overloading sewer capacity
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Gully trap is blocked by rubbish, leaves, debris
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Tree roots blocking drain
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Drain pipe has been crushed due to a heavy weight; for example, a vehicle has run over a pipe that is close to the surface
Overflowing stormwater drain
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Overflowing stormwater drain
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Tree roots blocking drain
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Stormwater pipe outlet that discharges into street is blocked
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Drain is too small for stormwater catchment
Stormwater drain blocked
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Stormwater drain is blocked by rubbish, leaves, debris
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Tree roots blocking drain
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Drainpipe has been crushed due to a heavy weight – for example, a vehicle has run over a pipe that is close to the surface