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Energy Efficiency h1
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Housing and Buildings under 300m2
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Ceilings
Buildings more than 300m2 - Ceilings
New construction R-values & how to achieve them - Ceilings
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 Ceilings for housing in H1/AS1 and H1/VM1
| Options | Climate Zone | |||||
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Roofs | ||||||
| Previous minimum requirements | R2.9 | R2.9/3.3 | R3.3 | |||
| Current minimum requirements | R6.6 | |||||
New construction R-values for ceilings
All New Zealand housing will require the same roof construction R-value of R6.6, which is a significant increase from the previous requirements – R2.9 and R3.3 depending on the previous zoning.
The insulation product R-values required will vary depending on the construction materials used in the project and the roof and ceiling designs. We will see a larger variety of products considered due to the type of roof and ceiling designs and the costs involved with various methods of installation.
Due to the large increase in the construction R-value required, we will see the introduction of some new products to the residential new-build market. Fibreglass and polyester insulation will remain the most common products, but these will be installed in different ways.
Skillion roof design
There are currently no Acceptable Solutions available such as NZS 3604 Timber-framed buildings or E2/AS1 External moisture with details, materials or dimensions for timber skillion roof construction, so any proposal submitted for building consent approval will be considered as an Alternative Solution.
Designers should prepare supporting evidence that their skillion roof design proposal will meet all its performance and durability requirements to the satisfaction of the building control officer processing the application.
Due to the number of queries received regarding this, BRANZ has been working on a skillion roof detail. Read more about BRANZ’s design HERE.
View Supplier Solutions for Ceilings
