May 7, 2020

Moisture Ingress and Drainage Standard

Are your rentals up to the Drainage Standard?

To be compliant with the Moisture Ingress and Drainage Standard, rental properties must have efficient drainage for the removal of storm water, surface water and ground water. Rental properties with an enclosed sub-floor space must have a ground moisture barrier.

Moisture can be a large source of dampness in a home. This dampness can lead to poor health outcomes for tenants and can be destructive to the quality of a house.

All private rentals must comply within 90 days of any new or renewed tenancy after 1 July 2021, with all private rentals complying by 1 July 2024. All boarding houses must comply by 1 July 2021. All houses rented by Kāinga Ora (formerly Housing New Zealand) and registered Community Housing Providers must comply by 1 July 2023.

What is the moisture ingress and drainage standard?

Rental properties must have efficient drainage for the removal of storm water, surface water and ground water, including an appropriate outfall. The drainage system must include gutters, downpipes and drains for the removal of water from the roof.

If the rental property has an enclosed subfloor, a ground moisture barrier must be installed if it is reasonably practicable to do so.

 Moisture Ingress and Drainage Standard

Moisture Ingress and Drainage Standard

Ground moisture barrier

A ground moisture barrier is generally a polythene sheet that can be bought from most building retailers. It can be installed by a house owner or a building professional.

Ground moisture barriers must either:

  • be a polythene sheet and installed in accordance with section 8 of New Zealand Standard NZS4246:2016, or
  • have a vapour flow resistance of at least 50MNs/g and be installed by a professional installer.

Exemptions to the moisture ingress and drainage standard

There is one specific exemption to the moisture ingress and drainage standard. This exemption covers properties where it is not reasonably practicable to install a ground moisture barrier.

It is not reasonably practicable to install something if a professional installer can’t access the area without:

  • carrying out substantial building work, or
  • causing substantial damage to the property, or
  • creating greater risks to a person’s health and safety than is normally acceptable, or
  • it is otherwise not reasonably practicable for a professional installer to carry out the work.

Other Standards

Need help with understanding the Drainage Standard?

We have dedicated property managers and have taken on board the new legislative requirements seriously.  All properties we manage will be compliant with the Healthy Home Standards.

If you need help with meeting the standards, talk to our team today on (09) 527 3980 or email info@investmentrentals.co.nz.

Visit our services page to see more how we can help you with your rental properties.

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