Energy efficiency requirements set out in the New Zealand Building Code need to be met, whether building a new home or making additions or alterations to an existing home.
The requirements vary for different parts of the country to ensure New Zealand homes are fit for purpose. More insulation is needed for houses in colder climates.
There are three main ways to check compliance with Building Code requirements. They are the:
• Schedule Method.
• Calculation Method.
• Verification Method.
Construction R-values for building elements can be determined using:
• The BRANZ House Insulation Guide
•NZS 4214:2006
• The Design Navigator web site www.designnavigator.co.nz, which offers a range of online tools for buildings.
The table below summarises the construction R-values specified in the acceptable solution for a house with timber-framed walls (low thermal mass).