All insulation retrofitted or installed in rental properties after 1 July 2016 must be installed in accordance with the New Zealand Standard Energy Efficiency NZ4246:2006 Installing Insulation.
Existing rental properties that already have insulation installed must be upgraded if the ceiling and underfloor insulation does not meet the R-value levels set out in Table 1 below.
|Timber-framed minimum||Masonry minimum|
|Ceiling R 1.9||Ceiling R 1.5|
|Underfloor R 0.9||Underfloor R 0.9|
Table 1 Level of Insulation below which rental properties must be upgraded (Product R-values)
These R values are roughly equivalent to those that applied for new buildings in the 1978 minimum thermal requirements (NZS4218P:1977). If your property was built after 1978 and complied with the minimum insulation requirements at the time they were built the property will comply, provided the insulation is in reasonable condition. This includes properties where the Verification Method or Alternative Solutions were used.
Existing rental properties which currently have no insulation in the ceilings and under floors must have new insulation installed in these places.
The new insulation must meet minimum requirements that are benchmarked on the current Building Code (H1/AS1) requirements for ceilings and underfloor areas (noted in Table 2 below).
|Zone 1 and 2||Zone 3|
|Ceiling R 2.9||Ceiling R 3.3|
|Underfloor R 1.3||Underfloor R 1.3|
Table 2 Minimum requirements for new and topped up insulation in rented homes (Product R-values)