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![wallbanner.jpg]({"1201":"/medias/sys_master/root/hdc/h57/11541564162078/wallbanner/wallbanner.jpg"} "wallbanner.jpg")
Buildings under 300m2 - Walls
New construction R-values & how to achieve them
Insulation is a barrier. It helps keep the heat in during the winter and can help keep the heat out during summer. This means that insulation is beneficial even in the warmest part of the country.
To be effective, the barrier has to be continuous in the building. That’s why the changes to Building Code clause H1 Energy Efficiency look at insulating all parts of a building – including ceilings, walls, floors, windows, doors and skylights. Below is an overview of the changes to construction R-value requirements in different parts of a building, and how they can be achieved.
Minimum R-values for Walls for housing in H1/AS1 and H1/VM1
| Options | Climate Zone | |||||
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Walls | ||||||
| Previous minimum requirements | R1.9 | R1.9/2.0 | R2.0 | |||
| Current minimum requirements | R2.0 | |||||
New construction R-values for walls
From 1 May 2023, walls in housing across New Zealand will have to meet a minimum construction R-value of R2.0. This is the same as applied to the previous zone 3 in the South Island. To achieve this, walls will require an insulation material with an R-value of R2.4 or higher.
The current wall construction will not have to change to accommodate the increases. The new R-value of R2.0 is achievable using standard 90mm wall framing.
View Supplier Solutions for Walls
