H1 Calculation method tool - BRANZ
- Abbreviation
- BRANZ - H1 Calculation method tool
- Valid from
- 3/09/2024
- Information provider
- BRANZ Limited,
- Author
- Building Research Association New Zealand Ltd.
- Information type
- Tool,
- Format
- Website,
Description
This tool checks for compliance of housing and small buildings with the calculation method of H1/AS1 5th edition amendment 1. Inputs are added on separate sheets and a results page is automatically generated, which can be submitted for compliance.
There are two calculation methods:
- H1 Calculation method tool [Full] This tool automatically applies the calculation method of H1/AS1 5th edition amendment 1 and generates a results page that can be used to demonstrate compliance.
- H1 Calculation method tool [Basic] This basic tool checks for compliance of housing and small buildings with the calculation method of H1/AS1 5th edition amendment 1.
Scope
Compliance requirements for H1/AS1 5th edition amendment 1
The use of H1/AS1 5th edition amendment 1 is restricted to housing, or buildings other than housing that are less than 300 m².
Buildings with curtain walling are excluded.
New methods for determining the thermal resistance and construction R-value of building elements are contained within H1/AS1 5th edition amendment 1 and include methods to calculate the R-values for slab-on-ground floors, windows, doors and skylights.
NZS 4218:2009 is no longer referenced within H1/AS1 5th edition amendment 1. Other standards have been added.
The climate zone maps have been revised to include six climate zones.
The window area of the building can be no greater than 40% of the total wall area.
The minimum R-value for a particular building element is 50% of the schedule method R-value for that type of building element.
Where heating is embedded in a building element, a higher minimum R-value is required. See H1/AS1 5th edition amendment 1 for details.
Please refer to H1/AS1 5th edition amendment 1 for full compliance information.
This tool can not be used for H1/AS2 1st edition, which deals with larger non-residential buildings that have different requirements.