Insulation R-values: everything you need to know (2025)

Understanding insulation R-values is crucial for a warm, energy-efficient home. The R-value measures a material's resistance to heat flow—the higher the value, the better the insulation.

New Zealand's Building Code sets minimum R-value requirements for new builds and extensions. These standards vary across six distinct climate zones to account for different weather conditions throughout the country.

Meeting these requirements is an upfront investment that leads to significant long-term savings on heating and cooling bills.