BRANZ Calculation Method Tool v9 Full (December 2025)

The webinar covers:

• What the H1 Calculation method is and when to use it
• Reference houses and how these are calculated
• The advantages, disadvantages and limitations of the calculation method
• Tricks + tips how to make it useful
• How to use and verify the output.

• Please note: that access to this webstream will expire after 1 month.

This Microsoft Excel (.xlxs) 25MB download of BRANZ House Insulation Guide 6th edition is for PC users.

Updates:

• Further fix to error where the R-value for slab floors were higher than they should have been when adding floor topper insulation
• New images for timber framed floors
• A worksheet added which provides simplifications to help with calculation and modelling for steel framed walls

The guide is now in two parts:

• The tables of construction R-values for common construction options for compliance under H1/AS1 and H1/VM1 5th edition
• The accompanying House Insulation Guide text [PDF] for guidance on insulation to meet or exceed H1 AS/1 and H1/VM1 5th edition.

This BRANZ webinar, in partnership with the Window and Glass Association of New Zealand (WGANZ), brings together experts from BRANZ, WGANZ and MBIE to explain the compliance requirements in H1/AS1 5th edition amendment 1.

Please note: that access to this webstream will expire after 1 month.