RTA Date July 1st 2019
INSULATION FOR RENTAL HOMES

Since 1st July 2019, it is compulsory for all rental homes to have ceiling and underfloor insulation installed to comply with local regulations and installed to standard NZS 4246.

TIMELINE FOR THE IMPLEMENTATION OF THE HEALTHY HOMES STANDARD

Rental property insulation: complying with the tenancy law changes

Since insulation became compulsory in all rental homes under the Residential Tenancies Regulations 2016, new requirements have come into effect with the launch of the healthy homes standard on 1st July 2021. The new healthy homes insulation standard has increased the minimum standard for existing insulation that is consistent with the Building Code 2008.

The standard requires ceiling insulation to be in a good condition and must now be at least 120mm thick. The standard also requires underfloor insulation to be in good condition and have a minimum R-value of R1.3.

There are some exemptions to the insulation standard:

1. Access

Areas that inaccessible to insulate.

2. Certain underfloor insulation

Existing underfloor insulation that is in reasonable condition.

3. Habitable Spaces

Ceilings or floors where there are other habitable spaces directly above or below.

Our recommendations for insulating with glasswool insulation:

NORTH ISLAND (ZONE 1 & 2)

Ceiling Insulation

Thickness of existing insulation*R-value (m2K/W)
0 - 60mm

R2.9 roll (GOOD)

R3.2 batt or roll (BETTER)

R4.1 batt (BEST)

60 - 100mm **R1.8 roll or R2.2 handy roll
80 - 100mm ***R1.8 roll or R2.2 handy roll

* Based on glasswool

** 60-80mm for masonry wall construction

*** Timber construction only. 80mm is suitable for masonry wall construction

Insulation must be installed to meet the standard NZS 4246

Underfloor Insulation

Thickness of existing insulation*R-value (m2K/W)
No insulation installed

R1.8 Underfloor roll with wind-wash barrier

* Based on glasswool

Insulation must be installed to meet the standard NZS 4246

SOUTH ISLAND & CENTRAL PLATEAU (ZONE 3)

Ceiling Insulation

Thickness of existing insulation*R-value (m2K/W)
0 - 60mm

R3.6 batt or roll (GOOD)

R4.1 roll (BETTER)

R5.2 batt (BEST)

60 - 100mm **R1.8 roll or R2.2 handy roll
80 - 100mm ***R1.8 roll or R2.2 handy roll

* Based on glasswool

** 60-80mm for masonry wall construction

*** Timber construction only. 80mm is suitable for masonry wall construction

Insulation must be installed to meet the standard NZS 4246

Underfloor Insulation

Thickness of existing insulation*R-value (m2K/W)
No insulation installed

R1.8 Underfloor roll with wind-wash barrier

* Based on glasswool

Insulation must be installed to meet the standard NZS 4246

Knauf Insulation has the products, the expertise, installation services and DIY install information required to help you meet your obligations as a landlord.

To arrange to have insulation professionally installed in your property contact us here or you will find a range of high quality, easy to install DIY Earthwool® glasswool insulation products at your local Bunnings and you can access our installation tips and advice and DIY videos below: