Description

Roof construction R-values will increase to R6.6 when New Zealand Building Code Acceptable Solution H1/AS1 5th edition becomes mandatory on 1 May 2023 (6 months later than first announced).

Have you thought about how you will deal with these changes in your designs?

Changes to the minimum thermal performance requirements for compliance with the 5th edition of Building Code clause H1 Energy efficiency are comprehensive and include increasing the energy efficiency of the roofs, walls, windows and floors of new buildings.

Scope

This article includes:

• Changes to roof insulation
• Using the schedule method
• Perimeter insulation can be reduced but …
• Other options for sloping trussed roofs
• Alternatively, increase other insulation
• Expect more changes in the future
• Considerations with raised heel trusses