The document provides an overview of changes to New Zealand's building code clause H1 regarding increased energy efficiency requirements. Key points include: - Increased insulation requirements for walls, roofs, floors, and windows based on three climate zones. - Three methods to determine compliance: schedule, calculation, or modeling depending on building design complexity. - Uninsulated buildings lose the most heat through the roof, walls, windows, and floor. Insulation levels are increased the most for the roof. - Examples are given of insulation levels needed to meet requirements for different building materials like concrete tiles, brick veneer, or stucco cladding. - The calculation method determines insulation requirements based on

1. NZBC Clause H1 Overview Robert Campion Architectural Profiles Ltd (APL) October 2007

2. energy efficiency “ Biggest energy efficiency steps in 30 years”

3. nzbc clause H1

4. energy efficiency The changes; tougher insulation requirements domestic hot water systems commercial lighting commercial HVAC systems

5. heat loss un-insulated house windows =12% walls =24% roof = 42% floor =10%

6. nzbc clause H1 Generally based on NZS 4218:2004 but… with increased R-values Tables shown within H1 replace those used in NZS 4218

7. climate zones Zone1 Auckland, North Zone 2 Balance North Island, except Central Plateau Zone 3 South Island & Central Plateau

8. new R values

9. new R values non-solid construction roof ; z1 = R2.9 z2 = R2.9 z3 = R3.3 floor ; z1 = R1.3 z2 = R1.3 z3 = R1.3 window ; z1 = 0.26 z2 = R0.26 z3 = R0.26 wall ; z1 = R1.9 z2 = R1.9 z3 = R2.0

10. nzbc clause H1 3 Methods of Compliance… Schedule Used when <30% of wall area is glazed Calculation Used when <50% of wall area is glazed Modeling Used when >50% of wall area is glazed and complex design

11. schedule method

12. floor un-insulated house floor = 10% z1 = R1.3 z2 = R1.3 z3 = R1.3

13. floor insulated timber floor draped foil 100mm sag carpet = R1.5 no carpet = R1.1 Pic Courtesy of BRANZ - BRANZ House Insulation Guide

14. floor concrete floor slab/perim. ratio = 1.5 insulated / no TB = R1.3 insulated with TB = R1.5 Pic Courtesy of BRANZ - Build Magazine

15. roof un-insulated house roof = 42% z1 = R2.9 z2 = R2.9 z3 = R3.3

16. roof concrete tile - truss blanket type timber battens z2 requirement = R2.9 insulation must meet R2.65 Pic Courtesy of BRANZ - BRANZ House Insulation Guide

17. walls un-insulated house walls = 24% z1 = R1.9 z2 = R1.9 z3 = R2.0

18. walls brick veneer blanket type 100 x 50 studs @ 600 z2 requirement = R1.9 insulation must meet R2.05 Pic Courtesy of BRANZ - BRANZ House Insulation Guide

19. walls stucco on cavity blanket type 100 x 50 studs @ 600 z2 requirement = R1.9 insulation must meet R2.15 Pic Courtesy of BRANZ - BRANZ House Insulation Guide

20. walls stucco on cavity blanket type 100 x 50 studs @ 400 z2 requirement = R1.9 insulation must meet R2.3 Pic Courtesy of BRANZ - BRANZ House Insulation Guide

21. windows un-insulated house windows =12% z1 = R0.26 z2 = R0.26 z3 = R0.26

22. schedule method

23. wers table

24. calculation method

25. calculation method Zone 2, 34.7% (45m 2 ) Glazed Area HL Ref = 38.9m2/0.26 + 6.1/0.31 = 149.6 + 19.7 = 169.3 m 2 o C/W

26. calculation method If window target = 169.3 … Aluminium frame / single clear glass R (Total) = 0.15 45m 2 @ 0.15 = 300 ( 130.7 must be made up elsewhere) equates to doubling all other values

27. calculation method If window target = 169.3 … Aluminium frame / clear IGU R (Total) = 0.26 45m 2 @ 0.26 = 173.1 ( 3.8 must be made up elsewhere)

28. calculation method If window target = 169.3 … Thermally broken frame/clear IGU R (Total) = 0.31 45m 2 @ 0.31 = 145.2 ( 24.1 can be reduced elsewhere)

29. modeling method Modeling Method Designer contacts a specialist with the appropriate software to calculate the building requirements

30. modeling method

31. status Zone 3 31 October 2007 Zone 2 30 June 2008 Zone 1 30 Sept 2008

32. thank you Refer to the Third Edition of NZBC Clause H1 – Energy Efficiency in conjunction with NZS 4218:2004 – Energy Efficiency, Small Building Envelope, for a full understanding of the changes.