Retaining walls
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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
Soil cracks at the top of bank or wall
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Tilting of retaining wall, pressure from soil or build up of water behind retaining wall due to blocked or no drainage
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Ground drying out, particularly with clay soils
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Developing slip following heavy rain
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Excavation or removal of support (on your or an adjacent property)
Ground slumping – gradual process
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The surrounding area, especially peat soils, is being drained
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Land that has been filled is settling
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Tilting of retaining wall pressure from soil/build-up of water behind retaining wall due to blocked or no drainage
Ground slumping – sudden
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Landslip or retaining wall failure
Lightweight aerated concrete panels cracked
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Impact damage
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Timber frame movement
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Panels at the end of their serviceable life
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Insufficient framing behind
Retaining wall bowing, bulging, tilting
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Inadequate design/foundations/construction
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Overloading from soil/vehicles at top of wall
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Pressure from soil/build up of water behind retaining wall due to blocked or no drainage
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Lack of free-draining material behind wall
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Incorrect wall slope
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Tree roots
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Ground in front of retaining wall has been excavated/undermined
Retaining wall – cracks
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Corrosion of reinforcing
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Inadequate initial design/construction
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Inadequate foundations – overloading of the soil supporting the wall
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Lack of free-draining material behind wall
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Wall at the end of its serviceable life
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Tree roots
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Overloading from soil/vehicles at the top of the wall
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Build up of water behind retaining wall due to blocked or no drainage
Crib wall misalignment
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Overloading from soil/vehicles at the top of the wall
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Overloading of soil at the base of the wall
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For timber cribs, rotting of the timber members
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Inadequate foundations
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Incorrect slope to the wall
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Tree roots
