PM23 H1 Guide TUMU 210x287mm 4.0 LR - Flipbook - Page 5
HOUSING & BUILDINGS
LESS THAN 300M2
The new housing and small building insulation requirements are the same. The only
difference between them is the transition date for the new final values to come into
effect
F
or ‘Buildings less than 300m2’, the new
requirements came into effect on 3 November
2022. For housing, the new requirements were
pushed back for six months, meaning they come into
effect on 1 May 2023.
•
Limiting uncontrollable airflow.
•
Hot water systems.
•
Artificial lighting.
The only exception is ‘windows and doors’, which
retained its original two-stage implementation –
3 November 2022 and 2 November 2023.
•
Heating, ventilation and air conditioning
(HVAC) systems.
The Building Code contains requirements for the
energy efficiency of buildings. These are found in
code clause H1 Energy Efficiency. This includes
requirements for:
•
This clause applies to the building envelope that
encloses spaces where the temperature or humidity
are modified in a building (conditioned spaces). The
building envelope is required to have adequate thermal
resistance to resist the flow of heat from hot to cold.
Insulation.
CLIMATE ZONE
1
2
3
4
5
6
ROOFS
Current minimum requirements
R2.9
R2.9/3.3
1 May 2023
R3.3
Current minimum requirements
R1.9
R1.9/2.0
1 May 2023
R2.0
R2.0
Current minimum requirements
R1.3
R1.5
R1.5
Other floors 1 May 2023
R1.5
R1.5
R2.5
R2.8
R1.6
R1.7
R3.0
WINDOWS & DOORS
Previous minimum requirements
1 May 2023
2 November 2023
8
However, until 1 May 2023, building consents for
‘Housing’ can use the “old” minimum construction
R-values for roofs, walls and floors – those in the
4th editions of H1/AS1 and H1/VM1.
On the left is an overview of the minimum R-values
for each building element for housing in H1/AS1 and
H1/VM1.
FLOORS
3 November 2022
Despite the extension for ‘Housing’, transition to the
new compliance documents for ‘Housing’ and
‘Building less than 300m2’ – the 5th editions of H1/AS1
and H1/VM1 – took place on 3 November 2022. This
means the previous 4th editions of these documents
can no longer be used for building consents.
R6.6
WALLS
Slab-on-ground floors 1 May 2023
NEW COMPLIANCE DOCUMENTS,
OLD R-VALUES?
The 5th editions of H1/AS1 and H1/VM1 include new
methodologies for establishing the thermal resistance
of windows, doors, skylights, curtain walling and
slab-on-ground floors. From 3 November 2022,
only the new methodologies can be used (with the
exception of slab-on-ground floors).
Minimum R-values for each building element for housing in H1/AS1 and H1/VM1
OPTIONS
Insulation is a barrier. It helps keep the heat in during
the winter and out during summer. This means that
insulation is beneficial even in the warmest part of the
country.
To be effective, the barrier has to be continuous in the
building. That’s why the H1 changes look at insulating
all parts of a building, including ceilings, walls, floors,
windows, doors and skylights.
We are focusing on insulation requirements in
buildings,
which are found in code clause H1.3.1(a).
H1 ENERGY EFFICIENCY
INSULATION
R02.6
R0.37
R0.37
R0.46
TUMU H1 GUIDE
R0.37
R0.37
R0.46
R0.50
R0.46
It’s important to note that meeting these R-values
is based on using the Schedule Method for
compliance. See more on this method and when it
can be used on pages 6-7.
When using the Calculation or
Modelling methods, individual
construction element R-values
may be higher or lower,
depending on several variables.
R0.50
9