PM23 H1 Guide TUMU 210x287mm 4.0 LR - Flipbook - Page 2
CLIMATE ZONE 1
CLIMATE ZONE 2
CLIMATE ZONE 3
ALL OVER H1
CLIMATE ZONE 4
CLIMATE ZONE 5
AUCKLAND
CLIMATE ZONE 6
HAMILTON
Want to be ‘All over H1’? Clause H1 of the New Zealand Building Code, which regulates
the energy efficiency of buildings, is undergoing its biggest change in more than
a decade. The first phase of implementation began on 3 November 2022, with a further
set of requirements beginning from 1 May 2023
T
umu Building Supplies is committed to
providing you with the information you
need to work within the rules. In this
H1 guide, you will find information provided
by the Ministry of Business, Innovation and
Employment (MBIE) on the changes, presented
as clearly and concisely as possible.
This guide also includes detailed supplier solutions
and related products, which will assist in speeding
up the design process for most standard construction
methods.
The Building Code clause H1 documents specify
construction R-values, not the R-value of the insulation
product to be installed.
WHAT BUILDING WORK IS AFFECTED?
NEW CLIMATE ZONES
This is an important difference. For example, an R5.0
thermal ceiling insulation blanket may be used but
the construction value of the ceiling may only be
R4.0 once the total ceiling construction design is
accounted for.
TWO SETS OF REQUIREMENTS,
THREE TRANSITION DATES
The H1 Clause of the Building Code regulates the
energy efficiency of the built environment –
covering wall, floor and ceiling insulation, as well
as the thermal performance of windows and doors.
There are major increases in thermal performance
requirements across the building envelope, indicated
through higher construction R-values for different
building elements.
Minimum insulation requirements differ across three
types of buildings:
•
Housing.
•
Small buildings – under 300m2.
•
Large buildings – over 300m2.
Housing covers all types of residential housing of
any size, including standalone houses, townhouses,
and apartments.
•
All other buildings are defined by size –
‘Buildings less than 300m2’ and ‘Buildings
more than 300m2’.
Improvements to the requirements under H1 were
published by MBIE in November 2021 and, more
recently, the transition periods for housing were
updated.
Material R-values – the thermal performance of
individual products (eg, insulation).
2. Construction R-value – the total thermal
performance (R-value) of a typical area of a
building element. For a wall, this would be derived
from the R-values of the cladding, insulation
material and a ‘typical area’ of wall framing.
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Industrial, assembly service and ancillary buildings,
as well as outbuildings, currently sit outside the
scope of this work.
However, where there is an office within a warehouse
or industrial building, that office would have to comply
with the new requirements.
TUMU H1 GUIDE
HUTT
WELLINGTON
WESTLAND
DUNEDIN
WAITANGI
CHATHAM
ISLAND COUNTY
INVERCARGILL
NEW CLIMATE ZONES
Building consents submitted from 3 November
2022:
•
All changes to ‘Buildings more than 300m2’
are in place.
•
All changes to ‘Buildings less than 300m2’
that are not housing are in place.
•
For Housing, regardless of size, everything is
on hold until May 2023 except an interim increase
to the R-value of windows and doors is in effect.
Building consents submitted from 1 May 2023:
•
‘Buildings more than 300m2’ requirements
differ from housing and small building
requirements.
There are two types of R-values commonly used in
the construction industry:
1.
The new housing and ‘Buildings less than 300m²’
insulation requirements are the same. The only
difference between them is the transition date for
the new final values to come into effect, as outlined
on the right.
PALMERSTON
NORTH
CHRISTCHURCH
CONSTRUCTION R-VALUES IN H1
An R-value is the measure used to describe the
ability of a material or system to resist the transfer of
heat. The higher the R-value, the better the thermal
resistance.
NELSON
Previously, New Zealand was divided into three
climate zones – Zones 1 and 2 for most of the
North Island and Zone 3 for the South Island and the
Central Plateau of the North Island. There are now
six climate zones across New Zealand, and the new
insulation requirements are tied to the zones.
WHEN ARE THE CHANGES HAPPENING?
The update to Clause H1 aims to make new buildings
warmer, drier and healthier, and, therefore, to reduce
the energy and environmental impact needed to heat
them. The changes are the biggest energy efficiency
updates to the acceptable solutions and verification
methods in more than a decade.
NAPIER
These changes only affect new construction or
existing properties undergoing changes to the external
thermal envelope, which will require building consent.
Tenancy retrofit insulation standards are separate and
not covered by the Building Act and Building Code.
Increases in thermal performance for ‘Housing’
will take effect on 1 May 2023, following an
extension on the transition period. This includes
ceilings, walls and floors.
HOW CAN YOU DETERMINE THE
REQUIREMENTS OF YOUR BUILD?
Three key things are needed to determine
the new requirements a building is subject
to:
THE BUILDING TYPE – IS IT HOUSING,
A BUILDING LESS THAN 300M2 OR
A BUILDING LESS THAN THAN 300M2?
THE SITE ADDRESS OF THE BUILDING
TO DETERMINE WHICH OF THE SIX NEW
CLIMATE ZONES IT’S IN.
Building consents submitted from 2 November
2023:
•
Windows and doors for ‘Housing and buildings
under 300m2’ will see a further increase in
November 2023.
WHEN THE CONSENT APPLICATION WILL
BE SUBMITTED.
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