Description

Adding insulation into the external walls of existing homes can help make the homes warmer, drier and healthier to live in and potentially reduce heating costs.

Retrofitting can also help New Zealand meet its target of a net-zero carbon economy by 2050 through reducing the operational energy use of buildings.

Scope

This bulletin covers:

1. Introduction
2. Building consent
3. Building Code, Building Act and Standards requirements
4. BRANZ Research into retrofitting wall insulation
5. Insulation materials and underlay
6. Wall linings and airtightness
7. More information

The scope of this bulletin is limited to retrofitting done from inside the building with wall linings replaced as part of the work.