BRANZ Calculation Method Tool v10 Basic (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.

In this free 20-minute module, you’ll learn about achieving or exceeding performance requirements to comply with H1 Energy efficiency using H1/AS1 and H1/VM1 5th edition amendment 1. These documents can be used until 26 November 2026. After that, the 6th edition of H1/AS1 and H1/VM1 must be used.

Topics include:

• What are construction R-values?
• Roofs – sloping and skillion
• Floors – underslab heating and slabs with attached unconditioned spaces
• Windows – compliance and avoid overheating
• Doors – compliance and opaque doors
• Walls – compliance and improved performance
• Secondary insulation – improve performance for walls and roofs

It is always helpful to start early when it comes to promoting good waste behaviours. This bilingual Samoan/English 'print your own' signage kit is ideal for labelling and sorting your on-site waste materials effectively.

Included in this REBRI On-site waste sorting signage kit you will find a 16-page set of A3 posters that include:

• Sorting made simple, a guide to set you up for on-site success
• Treated timber
• Untreated timber
• General metal
• Glass
• Flooring
• Plasterboard
• Cardboard
• Polystyrene
• Plastic (hard)
• Plastic (wrap and film)
• Concrete
• Aggregate
• Landfill
• Paint
• Build your own (a blank for you to customise)

These PDF signs have a QR code to access the BRANZ Resource recovery map to find your nearest facilities based on your search address.