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Blocked ventilation openings in foundation walls

  • The soil level has been built up, covering ventilation openings

    How to repair

  • Paving covers or partly covers the ventilation openings

    How to repair

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Subfloor – damp soil

  • 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

    How to repair

  • High water table or natural spring

    How to repair

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Subfloor – damp stains on underside of flooring

  • Leaking water or waste pipe 

    How to repair

  • Overflow or leak from wet area fixtures such as bath, shower, handbasin, dishwasher, clothes washer, hot water cylinder

    How to repair

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Subfloor – deterioration of the underside of particleboard flooring

Subfloor – timber decay

  • Damp subfloor space, lack of ventilation

    How to repair

  • Leaking water or waste pipe; overflowing or leaking from wet area fixtures such as bath, shower, handbasin, dishwasher, clothes washer, hot water cylinder

    How to repair

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Piles undermined

No lateral support (bracing) to piles

  • Bracing was not installed (even if a house has been repiled) – typical in older houses

    How to repair

  • Earthquake damage to existing bracing 

    How to repair

Loose wedges between pile and bearer

Subfloor – no insulation

  • 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

    How to repair

Pole foundations – bearer and/or joist damage/deterioration

Structural steel – rusted beams and/or columns and/or fixings

Subfloor services – loose wiring