There is no standard form to submit thermal design information with a building consent application. Some building consent authorities have requested the information is submitted on the worksheets distributed at the BRANZ H1 seminars, but that was not the purpose of these forms, and they would provide insufficient information across all of the compliance options to be of real value.
For the schedule method, a suggested way to present the information to demonstrate your building’s compliance with Clause H1 is shown in Table 1.
Step 1 – Check schedule method OK
Work your way through the BRANZ schedule method checklist (see BRANZ H1 support page on www.branz.co.nz). If you do not tick any of the ‘No’ boxes, you may proceed with the schedule method.
Step 2 – Summarise construction details
Start the form for the building consent authority with the location and a summary of construction details for the building (see Table 1).
Step 3 – Apply glazing rules
Work through the glazing rules from NZS 4218: 2004 Energy efficiency – Small building envelope Replacement Table 1 to show the glazing area is 30% or less.
Step 4 – Specify products and R-values
Detail the minimum required construction R-value, products specified with R-value, construction R-values achieved and references to support these values.
|Address||XYZ Street Suburb City|
|Climate zone||Climate zone 3|
|Roof||25º pitched roof with corrugated metal roof cladding on 90 x 45 mm rafters @ 900 mm centres and 90 x 45 ceiling joists @ 900 mm centres.|
|Walls||Direct-fixed timber bevelback weatherboard on 90 x 45 mm studs @ 600 mm centres and dwangs @ 800 mm centres.|
|Floor||Particleboard on 150 x 50 mm timber floor joists @ 600 mm centres.|
|Glazing type||[Specify brand] white powder coated aluminium frame IGU with clear/low-E glass. No skylights.|
|Area of glazing less than 30% of total wall area||Total glazing||= 34.6 m²|
|Total wall area||= 182 m²|
|Glazing/wall area||= 19%|
|Window area of east, south and west walls less than 30% of total wall area of these walls||Total glazing||= 19.4 m²|
|Total wall area||= 135 m²|
|Glazing/wall area||= 14.37%|
|Products to be used and R-values|
|Minimum required construction R-values in climate zone 3|| |
Product specified and R-value
|Construction R-value achieved||Reference to supporting technical data|
|[from BRANZ Appraisal or manufacturers’ specifications]||[from BRANZ House insulation guide]|
|Roof||R3.3||R3.6 [Specify brand] glass wool segments||R3.4||BRANZ House insulation guide page 30 and BRANZ Appraisal No. xxx (2008)|
|Walls||R2.0||R2.8 [Specify brand] glass wool segments||R2.4||BRANZ House insulation guide page 56 and BRANZ Appraisal No. xxx (2008)|
|Floors||R1.3||R1.4 [Specify brand] polystrene under wooden floor insulation||R1.8||BRANZ House insulation guide page 88 and BRANZ Appraisal No. xxx (2006)|
|Glazing (vertical)||R0.26||R0.31 [Specify brand] coated (white) aluminium frame IGU clear/low-E glass||R0.31||Table G2 in NZS 4218: 2004|
Articles are correct at the time of publication but may have since become outdated.