Description

The H1 calculation method is now the primary pathway for demonstrating compliance with Building Code clause H1 Energy efficiency for housing and buildings up to 300 m².

This bulletin explains the method, outlines the key changes in H1/AS1 6th edition and provides worked examples showing how different design choices can be used to achieve compliance.

Scope

This bulletin includes:

1. Introduction
2. Flexibility and limitations of the calculation method.
3. Determining the thermal envelope
4. Calculating construction R-values
5. Proposed building heat loss calculation
6. Reference building heat loss calculation
7. Examples using the calculation method
8. Calculation method tools
9. Further information