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Rob Campion of APL gives an overview of the NZBC Clause H1 - Energy Efficiency
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NZBC Clause H1Overview
Robert CampionArchitectural Profiles Ltd (APL)
October 2007
energy efficiency
“Biggest energy efficiency steps
in 30 years”
nzbc clause H1
energy efficiency
The changes;
tougher insulation requirements
domestic hot water systems
commercial lighting
commercial HVAC systems
heat loss
un-insulated house
windows =12%walls =24%
roof = 42%
floor =10%
nzbc clause H1
Generally based on NZS 4218:2004
but…with increased R-values
Tables shown within H1 replace those used in NZS 4218
climate zones
Zone1 Auckland, North
Zone 2 Balance North
Island, except Central Plateau
Zone 3South Island & Central Plateau
new R values
new R values
non-solid constructionroof; 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
nzbc clause H1
3 Methods of Compliance…
ScheduleUsed when <30% of wall area is glazed
CalculationUsed when <50% of wall area is glazed
ModelingUsed when >50% of wall area is glazedand complex design
schedule method
floor
un-insulated house
floor = 10% z1 = R1.3
z2 = R1.3
z3 = R1.3
floor
insulated timber floordraped foil100mm sagcarpet
= R1.5
no carpet
= R1.1Pic Courtesy of BRANZ - BRANZ House Insulation Guide
floor
concrete floorslab/perim. ratio
= 1.5
insulated / no TB
= R1.3
insulated with TB
= R1.5
Pic Courtesy of BRANZ - Build Magazine
roof
un-insulated house
roof = 42%
z1 = R2.9
z2 = R2.9
z3 = R3.3
roof
concrete tile - trussblanket typetimber battensz2 requirement
= R2.9
insulation mustmeet R2.65
Pic Courtesy of BRANZ - BRANZ House Insulation Guide
walls
un-insulated house
walls = 24%z1 = R1.9
z2 = R1.9
z3 = R2.0
walls
brick veneerblanket type100 x 50studs @ 600z2 requirement =
R1.9
insulation mustmeet R2.05
Pic Courtesy of BRANZ - BRANZ House Insulation Guide
walls
stucco on cavityblanket type100 x 50studs @ 600z2 requirement
= R1.9
insulation mustmeet R2.15
Pic Courtesy of BRANZ - BRANZ House Insulation Guide
walls
stucco on cavityblanket type100 x 50studs @ 400z2 requirement
= R1.9
insulation mustmeet R2.3
Pic Courtesy of BRANZ - BRANZ House Insulation Guide
windows
un-insulated house
windows =12% z1 = R0.26
z2 = R0.26
z3 = R0.26
schedule method
wers table
calculation method
calculation method
Zone 2, 34.7% (45m2) Glazed Area
HLRef = 38.9m2/0.26 + 6.1/0.31
= 149.6 + 19.7
= 169.3 m2 oC/W
calculation method
If window target = 169.3…
Aluminium frame / single clear glass R(Total) = 0.15
45m2 @ 0.15 = 300 (130.7130.7 must be made up elsewhere)
equates to doubling all other values
calculation method
If window target = 169.3…
Aluminium frame / clear IGU R(Total) = 0.26
45m2 @ 0.26 = 173.1 (3.83.8 must be made up elsewhere)
calculation method
If window target = 169.3…
Thermally broken frame/clear IGU R(Total) = 0.31
45m2 @ 0.31 = 145.2 (24.124.1 can be reduced elsewhere)
modeling method
Modeling Method
Designer contacts a specialist with the appropriate software to calculate the building requirements
modeling method
status
Zone 3 31 October 2007
Zone 2 30 June 2008
Zone 1 30 Sept 2008
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.
