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Documentation Index

Fetch the complete documentation index at: https://help.ratemyflat.co.nz/llms.txt

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A dry home starts from the ground up. This standard requires every rental to have efficient drainage and stops moisture from the ground rising into the home.

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Drainage requirements

Every home must have an efficient drainage system that handles:
  • Stormwater: Gutters and downpipes must be in good working order and lead to a proper outfall (like a council drain or soak pit).
  • Surface water: The land should be contoured so that water doesn’t pool under or against the house.
  • Groundwater: Effective drainage should prevent the soil under the house from becoming a swamp.

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Ground moisture barriers (GMB)

If a home has an enclosed subfloor (a crawl space under the floorboards), the landlord must install a ground moisture barrier. This is a thick sheet of 0.25mm polythene plastic that covers the entire ground area under the house. It stops the several litres of water that evaporate from the soil every day from rising into the floorboards and causing mould.

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Mould: Who is responsible?

Mould disputes are common. The source determines who has to act:
  • Structural mould: If mould is growing in large patches on the lower walls, or if there is a musty smell coming from the floorboards, it is often due to a lack of a ground moisture barrier or poor drainage. This is the landlord’s responsibility.
  • Condensation mould: If mould is on the ceiling or around window frames, it is often caused by moisture from cooking or showering not being ventilated. While the landlord must provide fans, the tenant is responsible for using them and opening windows.

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Practical tips for a dry home

  • Dry laundry outside: A single load of washing can release 5 litres of water into your air. If you must dry inside, use a dehumidifier or open a window.
  • Furniture placement: Leave a 10cm gap between your furniture and external walls to allow air to circulate. This prevents “closet mould.”
  • Check the gutters: If you see water cascading over the side of the gutters during rain, report it to your property manager immediately.

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Sources