Part J3 Elemental provisions for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings

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Part J3 Elemental provisions for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

NT Part J3 Elemental provisions for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

TAS Part J3 Elemental provisions for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

Introduction to this Part

This Part contains Deemed-to-Satisfy Provisions (elemental) for compliance with Part J1. It sets out provisions for the insulation of building fabric and the energy efficiency of domestic services of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

Notes

From 1 May 2023 to 30 September 2023 Section J of NCC 2019 Volume One Amendment 1 may apply instead of Section J of NCC 2022 Volume One. From 1 October 2023 Section J of NCC 2022 Volume One applies.

Notes: New South Wales Section J Energy Efficiency

For a Class 2 building or a Class 4 part of a building, where a relevant development consent or an application for a complying development certificate requires compliance with a BASIX Single Dwelling or Multi Dwelling Certificate issued under Version 3.0 or earlier, NSW Section J of NCC 2019 Volume One Amendment 1 applies.
For a Class 2 building or a Class 4 part of a building, where a relevant development consent or an application for a complying development certificate requires compliance with a BASIX Single Dwelling or Multi Dwelling Certificate issued under Version 4.0 or later, Section J of NCC 2022 Volume One applies.
For a Class 2 building or a Class 4 part of a building, where a relevant development consent or an application for a complying development certificate requires compliance with a BASIX Alterations and Additions Certificate, NSW Section J of NCC 2019 Volume One Amendment 1 applies.

Deemed-to-Satisfy Provisions

J3D1

Deemed-to-Satisfy Provisions

New for 2022

(1) Where a Deemed-to-Satisfy Solution is proposed, Performance Requirements J1P1 to J1P4 are satisfied by complying with—

J2D2; and
J3D2 to J3D15; and
J4D2 to J4D7; and
J5D2 to J5D8; and
J6D2 to J6D13; and
J7D2 to J7D9; and
J8D2 to J8D4; and
J9D2 to J9D5.

(2) Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A2G2(3) and A2G4(3) as applicable.

New for 2022

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State variations

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To clarify that J1P1 to J1P4 will be satisfied if compliance is achieved with Parts J2 to J9.

J3D1 Deemed-to-Satisfy Provisions

Where a solution is proposed to comply with the Deemed-to-Satisfy Provisions, J3D1 stipulates that compliance with nominated elements of Parts J2 to J9 achieves compliance with J1P1 to J1P4.

Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A2G2(3) and A2G4(3) as applicable. (See commentary on Part A2).

The Deemed-to-Satisfy Provisions described are limited to the most common forms of construction and the simplest forms of buildings. It is expected that the more innovative construction techniques and the more complex buildings will be designed and assessed using a performance approach.

J3D2

Application of Part

New for 2022

The Deemed-to-Satisfy Provisions of this Part apply to building elements forming the external building fabric and domestic services of a sole-occupancy unit of a Class 2 building and a Class 4 part of a building.

New for 2022

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State variations

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To clarify Part J3 applies to the building elements that make up the external fabric and domestic services of a sole-occupancy unit in a Class 2 building and a Class 4 part of a building.

J3D3

Reducing heating and cooling loads of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building using house energy rating software

2019: J0.2

(1) The sole-occupancy units of a Class 2 building or a Class 4 part of a building must—

for reducing the heating or cooling loads—
1. collectively achieve an average energy rating of not less than 7 stars, including the separate heating and cooling load limits; and
2. individually achieve an energy rating of not less than 6 stars, including the separate heating and cooling load limits; and
for thermal breaks, comply with J3D5 and J3D6; and
for compensating for a loss of ceiling insulation, other than where the house energy rating software has compensated for a loss of ceiling insulation, comply with Table J3D7w; and
for general thermal construction, comply with J4D3; and
for floor edge insulation, comply with J3D10(3), J3D10(5) and J3D10(6); and
for building sealing, comply with Part J5.

(2) Energy ratings referred to in (1)(a)(i) and (ii) must be achieved using—

house energy rating software; and
the load limits specified in the ABCB Standard for NatHERS Heating and Cooling Load Limits.

2019: J0.2

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State variations

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To clarify that J1P1 to J1P4 will be satisfied if compliance is achieved with Parts J2 to J9.

J3D1 Deemed-to-Satisfy Provisions

Where a solution is proposed to comply with the Deemed-to-Satisfy Provisions, J3D1 stipulates that compliance with nominated elements of Parts J2 to J9 achieves compliance with J1P1 to J1P4.

Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A2G2(3) and A2G4(3) as applicable. (See commentary on Part A2).

J3D4

Ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

2019: J0.3

(1) Ceiling fans must be installed in accordance with Table J3D4 in—

climate zones 1, 2 and 3; and
climate zone 5 in New South Wales and Queensland.

(2) Ceiling fans required by (1) must—

be permanently installed; and
have a speed controller.

Size of room (m²)	Minimum number and diameter (mm) of ceiling fans required for a bedroom in climate zones 1, 2 and 3	Minimum number and diameter (mm) of ceiling fans required in a habitable room other than a bedroom in climate zones 1, 2, 3 and 5 (NSW and Qld)
< 15	1 x 900	1 x 900
≥ 15 to < 20	1 x 1200	1 x 1200
≥ 20 to < 25	1 x 1200	1 x 1400
≥ 25 to < 30	1 x 1400	2 x 1200
≥ 30 to < 45	1 x 1400	2 x 1400
≥ 45 to < 50	2 x 1400	3 x 1200
≥ 50	2 x 1400	3 x 1400

2019: J0.3

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To set the minimum requirements for ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part.

J3D4 Ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

A ceiling fan may be required to provide high air movement as part of a house energy rating software solution and several sizes of fans are described in terms of their diameter and the floor area they serve.

J3D5

Roof thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

2019: J0.4

(1) A roof that—

has metal sheet roofing directly fixed to metal purlins, metal rafters or metal battens; and
does not have a ceiling lining or has a ceiling lining fixed directly to those metal purlins, metal rafters or metal battens,

must have a thermal break, consisting of a material with an R-Value of greater than or equal to R0.2, installed between the metal sheet roofing and its supporting metal purlins, metal rafters or metal battens.

(2) The requirements of (1) do not apply to roofs constructed using insulated sandwich panels.

2019: J0.4

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To set the minimum requirements for thermal breaks in roofs on a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

J3D5 Roof thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

Thermal bridging can compromise the thermal performance of a building, and metal roofs are particularly susceptible to this problem. To address this, J3D5 mandates the inclusion of thermal breaks in specific types of metal roofs. A roof must have a thermal break if it features metal sheet roofing directly affixed to metal purlins, rafters, or battens, and does not have a ceiling lining or has a ceiling lining fixed to a member of the metal roof frame (including a ceiling fixed to metal purlins, rafter or battens). These provisions address the localised heat transfer through poor detailing and apply in addition to the thermal bridging mitigation provisions of J3D7.

The thermal break material must have an R-Value of at least R0.2. This adds an insulating layer between the metal roof and its supporting structures, effectively reducing heat transfer. Roofs constructed with insulated sandwich panels are exempt from these requirements as sandwich panels limit thermal bridging.

J3D6

Wall thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

2019: J0.5

(1) A metal-framed wall that forms part of the building envelope must have a thermal break, consisting of a material with an R-Value of not less than R0.2, installed at all points of contact between the external cladding and the metal frame if the wall—

does not have a wall lining or has a wall lining that is fixed directly to the same metal frame; and
is clad with weatherboards, fibre-cement or the like, or metal sheeting fixed to a metal frame.

(2) The requirements of (1) do not apply to walls constructed using insulated sandwich panels.

2019: J0.5

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To set the minimum requirements for thermal breaks in walls on a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

J3D6 Wall thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

The primary focus of J3D6 is to ensure that metal-framed walls forming part of the building envelope incorporate thermal breaks. A thermal break is an insulating material designed to reduce thermal conductivity and inhibit the flow of thermal energy between conductive materials. In simple terms, thermal breaks minimise heat transfer and improve the overall thermal performance of a building. These provisions address the localised heat transfer through poor detailing and apply in addition to the thermal bridging mitigation provisions of J3D78.

Specifically, J3D6 mandates that any metal-framed wall must have a thermal break with an R-Value of at least R0.2 at all points of contact between the external cladding and the metal frame. This requirement is applicable when the wall does not have a lining or when the lining is directly affixed to the metal frame. Moreover, J3D6 provision applies to walls clad with weatherboards, fibre-cement, or metal sheeting. Walls constructed using insulated sandwich panels are exempt from these requirements as sandwich panels limit thermal bridging.

J3D7

Roofs and ceilings of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

(1) Roof and ceiling insulation must achieve the minimum R-Value—

in climate zone 1, in accordance with Tables J3D7a, J3D7b and J3D7c as applicable; and
in climate zone 2, in accordance with Tables J3D7d, J3D7e and J3D7f as applicable; and
in climate zone 3, in accordance with Tables J3D7g, J3D7h and J3D7i as applicable; and
in climate zone 4, in accordance with Tables J3D7j, J3D7k and J3D7l as applicable; and
in climate zone 5, in accordance with Tables J3D7m, J3D7n and J3D7o as applicable; and
in climate zone 6—
1. R3.5; or
2. if the roof contains reflective insulation, R3.0; and
in climate zones 7 and 8, in accordance with Tables J3D7p, J3D7q and J3D7r as applicable.

(2) Reflective insulation installed to comply with (1) must—

have a surface emittance of not more than 0.05; and
be adjacent to a roof space of not less than 20 mm; and
in climate zones 3 to 8, be downward facing.

(3) The thermal bridging in a metal-framed roof must be addressed as follows—

for a pitched roof with a horizontal ceiling—
1. achieving the Total R-Value in Table J3D7s, calculated using a method that accounts for the effects of thermal bridging; or
2. increasing the R-Value of the insulation between the ceiling frames by R0.5 more than the R-Value derived from (1); or
3. adding a continuous ceiling insulation layer with a minimum R-Value of R0.13 above or below the ceiling joists or the bottom chords of the trusses; or
4. achieving the required ceiling R-Value derived from (1) by stacking two layers of insulation immediately on top of each other, such that the top layer is orientated to cover the ceiling joists or bottom chord of the trusses and has an R-Value of at least R0.5; or
for a flat, skillion or cathedral roof—
1. achieving the Total R-Value in Table J3D7t, calculated using a method that accounts for the effects of thermal bridging; or
2. complying with Table J3D7u.

(4) Where F8D5(1) applies, continuous insulation placed above the primary insulation layer to mitigate thermal bridging must have a vapour permeance of not less than that of the primary insulation layer.

(5) Where, for operational or safety reasons, the area of ceiling insulation required is reduced, the loss of insulation must be compensated for in accordance with Table J3D7w.

(6) Where the ceiling insulation required by (1) to (5) has an R-Value—

greater than R3.0 and less than or equal to R4.5, it may be reduced to R3.0 within 450 mm of an external wall; or
greater than R4.5, it may be reduced to R3.0 within 450 mm of an external wall, provided all other required ceiling insulation is increased by R0.5.

(7) The requirements of (1) to (6) do not apply to roofs constructed using insulated sandwich panels.

(8) Roofs constructed using insulated sandwich panels must achieve the minimum Total R-Value in Table J3D7x.

(9) In climate zones 1 to 5, the solar absorptance of the upper surface of a roof must not be more than 0.64.

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Yes	1.0	1.5	2.0	2.5	3.0
No	1.5	2.0	2.5	3.0	4.0

Roof ventilation	Reflective insulation under-roof	Under-roof insulation R-Value	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Vented	Yes	< 1.0	1.5	1.5	1.5	1.5	2.0
≥ 1.0 to < 1.5	1.5	1.5	1.5	1.5	1.5
≥ 1.5 to < 2.0	1.5	1.5	1.5	1.5	1.5
≥ 2.0	1.5	1.5	1.5	2.0	2.0
No	< 1.0	2.0	2.5	4.0	5.0	X
≥ 1.0 to < 1.5	1.5	1.5	1.5	1.5	2.5
≥ 1.5 to < 2.0	1.5	1.5	1.5	2.0	2.0
≥ 2.0	1.5	1.5	1.5	1.5	1.5
Standard	Yes	< 1.0	1.5	1.5	2.0	3.0	4.0
≥ 1.0 to < 1.5	1.5	1.5	1.5	1.5	2.5
≥ 1.5 to < 2.0	1.5	1.5	1.5	1.5	2.0
≥ 2.0	1.5	1.5	1.5	1.5	1.5
No	< 1.0	2.5	4.0	6.0	X	X
≥ 1.0 to < 1.5	1.5	1.5	1.5	1.5	4.0
≥ 1.5 to < 2.0	1.5	1.5	2.0	2.0	2.5
≥ 2.0	1.5	1.5	1.5	2.0	2.5

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Yes	1.5	1.5	2.0	3.0	4.0
No	1.5	3.5	5.0	X	X

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Yes	2.0	2.5	2.5	3.0	3.5
No	3.0	3.0	3.5	4.0	4.5

Roof ventilation	Reflective insulation under-roof	Under-roof insulation R-Value	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Vented	Yes	Any	2.5
No	0 to < 0.5	2.5	3.0	3.0	3.5	3.5
≥ 0.5	2.5
Standard	Yes	Any	2.5
No	0 to < 0.5	3.0	3.0	3.5	4.0	4.0
≥ 0.5 to < 1.0	2.5	2.5	2.5	3.0	3.0
≥ 1.0	2.5

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Yes	2.5	2.5	2.5	2.5	2.5
No	3.0	3.0	3.5	4.0	4.0

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Yes	2.0	2.0	2.5	2.5	3.0
No	3.0	3.5	4.0	4.5	5.0

Table J3D7h Timber-framed pitched roof with horizontal ceiling — minimum R-Values for ceiling insulation: climate zone 3

Roof ventilation	Reflective insulation under-roof	Under-roof insulation R-Value	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Vented	Yes	< 0.5	2.5	2.5	2.5	2.5	2.5
		≥ 0.5 to < 1.0	2.0	2.0	2.0	2.0	2.0
		≥ 1.0 to < 1.5	2.5	2.0	2.0	2.0	2.0
		≥ 1.5 to < 2.0	2.0	2.0	2.5	2.5	2.5
		≥ 2.0	2.5	2.5	3.0	3.0	3.0
	No	< 0.5	3.5	4.0	4.5	5.0	X
		≥ 0.5 to < 1.0	3.0	3.5	3.5	4.0	4.5
		≥ 1.0 to < 1.5	2.5	3.0	3.0	3.0	3.5
		≥ 1.5 to < 2.0	2.5	3.0	3.0	3.0	3.0
		≥ 2.0	2.5	2.5	3.0	3.0	3.0
Standard	Yes	< 0.5	2.0	2.0	2.5	2.5	2.5
		≥ 0.5 to < 1.0	2.0	2.0	2.5	2.5	2.5
		≥ 1.0 to < 1.5	2.0	2.0	2.0	2.0	2.5
		≥ 1.5 to < 2.0	2.0	2.5	2.5	2.5	3.0
		≥ 2.0	2.0	2.0	2.5	2.5	2.5
	No	< 0.5	3.5	4.0	5.0	X	X
		≥ 0.5 to < 1.0	3.0	3.0	3.5	4.0	5.0
		≥ 1.0 to < 1.5	2.5	2.5	3.0	3.0	3.5
		≥ 1.5 to < 2.0	2.0	2.0	2.5	2.5	2.5
		≥ 2.0	2.0	2.0	2.5	2.5	2.5

Table Notes

SA = solar absorptance.
A roof is considered ‘vented’ if it—
1. has one wind-drive roof ventilator per 50 m² of ceiling area with gable, eave or ridge vents; or
2. has one powered roof ventilator per 200 m² of ceiling area with gable, eave or ridge vents; or
3. is a tiled roof without sarking-type material at roof level.
If a roof is not ‘vented’, it is a ‘standard’ roof.
The R-Value of reflective insulation is not to be included in the R-Value of any under-roof or ceiling insulation.
R-Values listed are for the labelled, declared R-Value of insulation.
X = not permitted.

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64
Yes	2.0	2.0	2.5	2.5	2.5
No	3.5	4.0	5.0	X	X

Reflective insulation under-roof	≤ 0.64
Yes	2.0
No	2.5

Roof ventilation	Reflective insulation under- roof	Under-roof insulation R-Value	SA ≤ 0.23	SA > 0.23 to ≤ 0.64
Vented	Yes	< 0.5	3.0	3.5
≥ 0.5	3.0	3.0
No	Any	3.5
Standard	Yes	Any	3.0
No	< 0.5	3.5
≥ 0.5	3.0

Reflective insulation under-roof	SA ≤ 0.64
Yes	3.0
No	3.5

Reflective insulation under-roof	SA ≤ 0.42	SA > 0.42 to ≤ 0.64
Yes	3.0	3.5
No	4.0	4.0

Roof ventilation	Reflective insulation under- roof	Under-roof insulation R-Value	SA ≤ 0.42	SA > 0.42 to ≤ 0.64
Vented	Yes	< 0.5	3.0	2.5
≥ 0.5	2.5
No	0 to < 2.0	3.0
≥ 2.0	2.5
Standard	Yes	Any	2.5
No	0 to < 1.0	3.0
≥ 1.0 to < 2.0	2.5
≥ 2.0	3.0

Reflective insulation under- roof	R-Value
Yes	2.5
No	3.0

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64	SA > 0.64 to ≤ 0.73	SA > 0.73
Yes	3.5	3.5	3.5	3.0	3.0	3.0	2.5
No	4.0	3.0	3.0	2.5	2.5	2.5	2.0

Roof ventilation	Reflective insulation under-roof	Under-roof insulation R-Value	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64	SA > 0.64 to ≤ 0.73	SA > 0.73 to ≤ 0.85	SA > 0.85
Standard	Yes	0 to < 1.0	4.5	4.5	4.5	4.0	4.0	4.0	4.0	4.0
≥ 1.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0
No	0 to < 1.0	5.0	4.5	4.5	4.0	4.0	3.5	3.5	3.5
≥ 1.0 to < 1.5	4.5	4.5	4.0	4.0	4.0	4.0	3.5	3.5
≥ 1.5	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0
Vented	Yes	0 to < 1.0	4.5	4.5	4.5	4.5	4.5	4.0	4.0	4.0
≥ 1.0	4.5	4.5	4.5	4.5	4.0	4.0	4.0	4.0
No	0 to < 1.0	5.0	4.5	4.5	4.5	4.0	4.0	3.5	3.5
≥ 1.0 to < 1.5	4.5	4.5	4.5	4.5	4.0	4.0	4.0	4.0
≥ 1.5	4.5	4.5	4.5	4.5	4.5	4.0	4.0	4.0

Reflective insulation under-roof	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64	SA > 0.64 to ≤ 0.73	SA > 0.73 to ≤ 0.85	SA > 0.85
Yes	4.5	4.5	4.5	4.0	4.0	4.0	4.0	4.0
No	5.0	4.5	4.5	4.0	4.0	3.5	3.5	3.5

Ceiling insulation R-Value from Tables J3D7a to J3D7r and J3D7(1)(f) as applicable	Minimum Total R-Value to account for thermal bridging
1.5	1.38
2.0	1.74
2.5	2.09
3.0	2.43
3.5	2.63
4.0	2.95
4.5	3.27
5.0	3.59
5.5	3.91
6.0	4.23

Ceiling insulation R-Value from Tables J3D7a to J3D7r, and J3D7(1)(f) as applicable	Minimum Total R-Value to account for thermal bridging: heat flow down	Minimum Total R-Value to account for thermal bridging: heat flow up
1.0	1.40	1.32
1.5	1.86	1.78
2.0	2.29	2.21
2.5	2.71	2.63
3.0	3.11	3.02
3.5	3.31	3.22
4.0	3.66	3.57
4.5	3.98	3.90
5.0	4.32	4.22
5.5	4.63	4.53
6.0	4.93	4.82

Minimum ceiling R-Value from Tables J3D7a to J3D7r, and J3D7(1)(f) as applicable	Option 1– increase insulation between roof frame members to specified minimum R-Value	Option 2 – add a layer of continuous insulation with specified minimum R-Value above or below the roof frame members
1.0	1.5	0.13
1.5	2.5	0.30
2.0	3.5	0.30
2.5	5.0	0.40
3.0	6.0	0.60
3.5	X	0.60
4.0	X	0.60
4.5	X	0.60
5.0	X	0.60
5.5	X	0.60
6.0	X	0.60

Climate zone	Direction of heat flow
1	Down
2 – altitude less than 300 m	Down
2 – altitude 300 m or more	Down and up
3	Down and up
4	Up
5	Up
6	Up
7	Up
8	Up

Percentage of ceiling area uninsulated	Minimum R-Value of ceiling insulation required to satisfy J3D7(1) and J3D7(3 )
0.5% to less than 1.0%	1.0	1.6	2.2	2.8	3.4	4.0	4.7	5.4	6.2	6.9
1.0% to less than 1.5%	1.1	1.7	2.3	2.9	3.6	4.4	5.2	6.1	7.0	X
1.5% to less than 2.0%	1.1	1.7	2.4	3.1	3.9	4.8	5.8	6.8	X	X
2.0% to less than 2.5%	1.1	1.8	2.5	3.3	4.2	5.3	6.5	X	X	X
2.5% to less than 3.0%	1.2	1.9	2.6	3.6	4.6	5.9	X	X	X	X
3.0% to less than 4.0%	1.2	2.0	3.0	4.2	5.7	X	X	X	X	X
4.0% to less than 5.0%	1.3	2.2	3.4	5.0	X	X	X	X	X	X

Climate zone	SA ≤ 0.23	SA > 0.23 to ≤ 0.32	SA > 0.32 to ≤ 0.42	SA > 0.42 to ≤ 0.53	SA > 0.53 to ≤ 0.64	SA > 0.64 to ≤ 0.73	SA > 0.73 to ≤ 0.85	SA > 0.85
1	1.86	3.31	4.32	X	X	X	X	X
2 – heat flow down	3.11	3.11	3.31	3.66	3.66	X	X	X
2 – heat flow up	3.02	3.02	3.22	3.57	3.57	X	X	X
3 – heat flow down	3.31	3.66	4.32	X	X	X	X	X
3 – heat flow up	3.22	3.57	4.22	X	X	X	X	X
4	3.22	3.22	3.22	3.22	3.22	X	X	X
5	3.02	3.02	3.02	3.02	3.02	X	X	X
6	3.57	3.57	3.57	3.57	3.57	3.57	3.57	3.57
7	4.22	3.90	3.90	3.57	3.57	3.22	3.22	3.22
8	3.90	3.57	3.57	3.22	3.22	3.02	3.02	3.02

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To set the minimum requirements for insulating roofs and ceilings for Class 2 sole-occupancy units or a Class 4 part of a building.

J3D7 Roofs and ceilings of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D7 sets varying minimum ceiling insulation R-Values depending on the roof construction, colour and ventilation levels, and the buildings location across different NCC climate zones. J3D7 also states that reflective insulation should have a surface emittance of not more than 0.05 and must be adjacent to a roof space of at least 20 mm. Additionally, in climate zones 3 to 8, the reflective insulation must be downward-facing to ensure it is effective.

There are multiple options to mitigate thermal bridging in metal-framed roofs, These provisions all aim to reduce the overall heat transfer through the metal framing so that it is approximately the same as an equivalent timber-framed structure. For pitched roofs with horizontal ceilings, options include achieving a specified Total R-Value or increasing the insulation R-Value between the ceiling frames, or adding a continuous insulation layer above or below the ceiling framing, or achieving the required ceiling insulation by stacking layers such that the top layer is oriented to cover the ceiling joist or bottom chord of the truss. For flat, skillion, or cathedral roofs, provisions are provided to either achieve specified Total R-Values in Table J3D7t or take mitigating actions specified in Table J3D7u. Thermal bridging provisions apply in addition to the thermal break provisions.

For ventilated roof spaces in climate zones 6, 7, and 8, continuous insulation placed above the primary insulation layer to mitigate thermal bridging must have a vapour permeance at least that of the primary insulation layer to avoid the build-up of condensation.

J3D7 also allows for compensation in instances where operational or safety concerns necessitate reduced ceiling insulation. Specifically, the loss of insulation must be offset as laid out in Table J3D7w. The provision also allows for reduced ceiling insulation R-Values near external walls, provided that thicker insulation is used elsewhere to compensate. This is in recognition of the fact that the roof space height typically reduces at the perimeter, where the roof meets the walls.

Roofs constructed with insulated sandwich panels are not subject to these rules but must meet the minimum Total R-Value requirements stipulated in Table J3D7x.

Maximum solar absorptance requirements are also set to discourage the use of dark-coloured roofs in hot climates.

To set the minimum requirements for insulating roofs and ceilings for Class 2 sole-occupancy units or a Class 4 part of a building.

J3D7 Roofs and ceilings of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

Roofs constructed with insulated sandwich panels are not subject to these rules but must meet the minimum Total R-Value requirements stipulated in Table J3D7x.

Maximum solar absorptance requirements are also set to discourage the use of dark-coloured roofs in hot climates.

J3D8

External walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

(1) The Total R-Value of an external wall—

in climate zones 1, 2, 3, 5 and 6—
1. where the ratio of the area of opaque external walls to the floor area of the sole-occupancy unit is less than 20%, must be at least R1.15; and
2. where the ratio of the area of opaque external walls to the floor area of the sole-occupancy unit is greater than or equal to 20% but less than 35%, must be at least R2.04; and
3. where the ratio of the area of opaque external walls to the floor area of the sole-occupancy unit is greater than or equal to 35%, must be at least R2.24; and
in climate zones 4, 7 and 8, must be at least R2.24.

(2) The Total R-Value of an external wall must be determined in accordance with—

for a spandrel panel in a curtain wall system, in accordance with Specification 38; and
for all other walls, in accordance with AS/NZS 4859.2.

(3) The solar absorptance of an external wall must—

in climate zones 1 to 6, be in accordance with Table J3D8a; and
in climate zones 7 and 8, be in accordance with Table J3D8b.

Climate zone	Opaque external wall to net floor area ratio	Permitted solar absorptance
1 and 3	< 45%	≤ 0.8
≥ 45%	≤ 0.35
2	< 35%	Any
≥ 35%	Any, or ≤ 0.35, if shading device overhang is < 300 mm
4 and 5	< 45%	Any
≥ 45%	≤ 0.35, if shading device overhang is < 1500 mm
6	Any	Any

Opaque external wall to net floor area ratio	Shading device overhang (mm)
< 20%	Any	Any	≥ 0.4	X
≥ 20% to < 35%	Any	Any	X	X
≥ 35% to < 45%	Any	≥ 0.4	X	X
≥ 45%	Any	≥ 0.6	X	X

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To set the minimum requirements for external walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

J3D8 External walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

The thermal performance of external walls is crucial for the overall energy efficiency of a building and J3D8 addresses this by specifying the required Total R-Values based on climate zones and the ratio of the opaque external walls to floor area. For climate zones 1, 2, 3, 5, and 6, the required Total R-Value varies from R1.15 to R2.24 based on that ratio. For climate zones 4, 7, and 8 a minimum R2.24 is required, regardless of the wall-to-floor area ratio.

J3D8 also outlines how to determine the Total R-Value. For spandrel panels in curtain wall systems, Specification 38 should be followed. For all other walls, consult AS/NZS 4859.2. Lastly, J3D8 provides guidelines on the solar absorptance of external walls, which varies depending on the climate zone. Solar absorptance tables for different climate zones are provided to guide this.

J3D9

Wall-glazing construction of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

(1) The Total System U-Value of wall-glazing construction that forms part of the external building fabric must not be greater than—

in climate zones 1 to 5, U2.2; or
in climate zone 6, U2.0; or
in climate zones 7 and 8, U1.4.

(2) The Total System U-Value of wall-glazing construction that forms part of the external building fabric must be calculated in accordance with Specification 37.

(3) Wall components of wall-glazing construction must achieve a minimum Total R-Value of—

where the wall is less than 80% of the area of the wall-glazing construction, R1.0; or
where the wall is 80% or more of the area of the wall-glazing construction, the value specified in Table J4D6a for a Class 3 building.

(4) In climate zones 1 to 6, the solar admittance of externally facing wall-glazing construction must be not greater than that shown in Table J3D 9.

(5) In climate zones 7 and 8, glazing in a wall-glazing construction must have a Total System SHGC of at least 0.4.

(6) The solar admittance of a wall-glazing construction must be calculated in accordance with Specification 37.

(7) The solar absorptance of an external wall must be in accordance with J3D8(3).

Climate zone	Eastern aspect solar admittance	Northern aspect solar admittance	Southern aspect solar admittance	Western aspect solar admittance
1	0.10	0.10	0.14	0.10
2	0.10	0.10	0.10	0.10
3	0.11	0.11	0.11	0.11
4	0.11	0.11	0.11	0.11
5	0.13	0.13	0.13	0.13
6	0.14	0.14	0.14	0.14
7	N/A	N/A	N/A	N/A
8	N/A	N/A	N/A	N/A

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To set the minimum requirements for wall glazing for Class 2 sole-occupancy units or a Class 4 part of a building.

J3D9 Wall-glazing construction of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D9 details specifications for external wall-glazing construction in different climate zones. It sets the Total System U-Value — a measure of heat transfer — for wall-glazing constructions, indicating the maximum allowed values ranging from U1.4 in colder climates (zones 7 and 8) to U2.2 in warmer zones (1 to 5). The U-Value must be calculated according to Specification 37, ensuring a consistent method of measurement.

Furthermore, the provision sets a backstop on the minimum Total R-Value (thermal resistance) of the opaque wall components within a wall-glazing construction. This is dependent on what proportion the wall takes up in the entire construction. For instance, if the wall constitutes less than 80% of the wall-glazing construction, it must have a minimum R-Value of R1.0. If the wall comprises 80% or more, the R-Value must be according to what is specified for Class 3 buildings in Table J4D6a.

Solar admittance and solar absorptance are crucial factors in thermal comfort. Solar absorptance of an external wall must be in accordance with either Table J3D8a or J3D8b. The solar admittance values are confined by climate zone and must be calculated according to Specification 37. For colder climate zones (7 and 8), the glazing must have a Total System SHGC (Solar Heat Gain Coefficient) of at least 0.4.

J3D10

Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

(1) Where a sole-occupancy unit of a Class 2 building or a Class 4 part of a building has a concrete floor above an unenclosed carpark, undercroft, or the like, underfloor insulation must be installed with an R-Value at least—

in climate zone 2 and climate zones 5 to 8, R2.0; and
in climate zones 3 and 4, R1.5.

(2) Where a sole-occupancy unit of a Class 2 building or Class 4 part of a building has a concrete floor above an enclosed carpark, undercroft or the like, underfloor insulation must be installed with an R-Value at least—

in climate zone 2, R0.5; and
in climate zones 4 and 5, R1.0; and
in climate zone 6, R1.5; and
in climate zones 7 and 8, R2.0.

(3) A concrete slab-on-ground with an in-slab or in-screed heating or cooling system must have insulation with an R-Value at least 1.0 installed around the vertical edge of tis perimeter.

(4) Except for a waffle-pod slab—

in climate zones 6 and 7—
1. insulation with an R-Value of at least 0.64 must be installed around the vertical edge of its perimeter; and
2. insulation with an R-Value of at least 0.64 must be installed underneath the slab; and
in climate zone 8—
1. insulation with an R-Value of at least 1.0 must be installed around the vertical edge of its perimeter; and
2. insulation with an R-Value of at least 2.0 must be installed underneath the slab.

(5) Insulation required by (3), (4)(a)(i) and (4)(b)(i) must—

be water resistant; and
be continuous from the adjacent finished ground level—
1. to a depth of not less than 300 mm; or
2. for at least the full depth of the vertical edge of the concrete slab-on-ground.

(6) The requirements of (3) do not apply to an in-screed heating or cooling system used solely in a bathroom, amenity area or the like.

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To set the minimum requirements for floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

J3D10 Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D10 addresses thermal performance requirements for different types of floors, paying special attention to floors above carparks or undercrofts. Underfloor insulation is obligatory for suspended concrete floors, with varying R-Values determined by climate zone and the nature of the space beneath the floor (e.g. enclosed or unenclosed carpark).

For concrete slab-on-ground with in-slab or in-screed heating or cooling systems, J3D10 mandates a minimum R-Value of 1.0 for insulation around the vertical edge of the slab's perimeter. Insulation requirements for in-screed heating or cooling systems that are solely used in bathrooms, amenity areas, or similar spaces do not apply.

In climate zones 6 to 8, minimum R-Value requirements are also set for around the perimeter and underneath slab-on-ground, regardless of in-screed heating or cooling, with R-Values depending on the climate zone. Waffle-pod slabs are exempt because of their inherent insulating properties.

Water resistance for insulation required around the slab's perimeter must be achieved. This insulation must also be continuous from the adjacent ground level to a minimum depth of 300 mm or at least the full depth of the vertical edge of the concrete slab, ensuring thermal performance is not compromised.

J3D11

External winter glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

(1) In climate zones 2 to 8, the ratio of the conductance (C_U) and solar heat gain (C_SHGC) of the glazing of each storey, including any mezzanine, of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building must—

not exceed the allowance obtained from Table J3D11a; and
be calculated in accordance with the following formula:

$\frac{[(A_{1} \times U_{1} \times B C_{1} \times O C_{1} \times R_{W 1}) + (A_{2} \times U_{2} \times B C_{2} \times O C_{2} \times R_{W 2}) + . . .]}{[(A_{1} \times S H G C_{1} \times E_{W 1} \times B S_{W 1} \times F_{W 1} \times H_{W 1} \times R_{W 1}) + (A_{2} \times S H G C_{2} \times E_{W 2} \times B S_{W 2} \times F_{W 2} \times H_{W 2} \times R_{W 2}) + . . .]}$

(2) In the formula at (1)(b)—

$A_{1, 2, e t c}$
= the area of each glazing element; and
$U_{1, 2, e t c}$
= the Total System U-Value of each glazing element; and
$S H G C_{1, 2, e t c}$
= the Total System SHGC for each glazing element, not exceeding 0.7; and
$E_{W}_{1, 2, e t c}$
= the winter exposure factor for each glazing element obtained from Table J3D11b, J3D11c, J3D11d, J3D11e, J3D11f or J3D11g; and
$B C_{1, 2, e t c}$
= the bedroom conductance factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and
$O C_{1, 2, e t c}$
= the orientation sector conductance factor obtained from Table J3D11n; and
$R_{W 1, 2, e t c}$
= the room type factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and
$B S_{W 1, 2, e t c}$
= the bedroom solar heat gain factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and
$F_{W 1, 2, e t c}$
= the frame factor obtained from Table J3D11o, J3D11p, J3D11q, J3D11r, J3D11s or J3D11t for each glazing element; and
$H_{W 1, 2, e t c}$
= the floor factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m for each glazing element.

(3) For the purpose of J3D11—

orientation sectors must be determined in accordance with Figure 13.3.2a of the ABCB Housing Provisions; and
P/H must be determined in accordance with Figure S37C7; and
For P/H between those in Tables J3D11b, J3D11c, J3D11d, J3D11e, J3D11f and J3D11g, either use the next highest P/H or interpolate.

Climate zone	Maximum conductance to solar heat gain ratio (C_U/C_SHGC)
2	16.95
3	19.88
4	13.34
5	11.83
6	6.27
7	12.90
8	12.90

P/H	North	North east	East	South east	South	South west	West	North west
0.00	1.49	1.61	1.23	0.96	0.68	1.03	1.37	1.71
0.05	1.44	1.53	1.14	0.81	0.57	0.90	1.27	1.64
0.10	1.38	1.48	1.09	0.76	0.53	0.85	1.22	1.55
0.20	1.21	1.32	0.97	0.69	0.50	0.75	1.10	1.39
0.40	1.00	1.06	0.77	0.57	0.42	0.63	0.92	1.14
0.60	0.83	0.87	0.69	0.50	0.37	0.55	0.77	0.96
0.80	0.62	0.69	0.56	0.43	0.35	0.50	0.66	0.79
1.00	0.43	0.59	0.46	0.41	0.33	0.43	0.56	0.65
1.20	0.26	0.47	0.40	0.36	0.31	0.40	0.53	0.53
1.40	0.22	0.40	0.33	0.33	0.29	0.38	0.47	0.44
1.60	0.18	0.32	0.31	0.33	0.28	0.35	0.39	0.39
1.80	0.15	0.28	0.27	0.31	0.26	0.33	0.35	0.32
2.00	0.12	0.21	0.24	0.29	0.26	0.33	0.33	0.31

P/H	North	North east	East	South east	South	South west	West	North west
0.00	0.90	1.10	0.88	0.69	0.50	0.58	0.67	0.91
0.05	0.89	1.06	0.82	0.60	0.44	0.51	0.64	0.89
0.10	0.83	1.01	0.78	0.58	0.42	0.49	0.61	0.84
0.20	0.74	0.90	0.70	0.52	0.40	0.44	0.55	0.76
0.40	0.59	0.74	0.60	0.43	0.36	0.37	0.47	0.63
0.60	0.44	0.57	0.48	0.39	0.34	0.32	0.38	0.51
0.80	0.30	0.45	0.43	0.34	0.30	0.30	0.32	0.41
1.00	0.20	0.38	0.35	0.30	0.28	0.28	0.29	0.33
1.20	0.14	0.29	0.31	0.28	0.28	0.25	0.24	0.28
1.40	0.11	0.26	0.25	0.26	0.26	0.23	0.21	0.24
1.60	0.08	0.23	0.24	0.24	0.24	0.21	0.20	0.20
1.80	0.07	0.16	0.19	0.24	0.24	0.19	0.17	0.18
2.00	0.06	0.16	0.18	0.21	0.24	0.19	0.15	0.16

P/H	North	North east	East	South east	South	South west	West	North west
0.00	1.58	1.66	1.16	0.93	0.70	0.78	0.85	1.38
0.05	1.54	1.60	1.06	0.79	0.58	0.66	0.79	1.32
0.10	1.53	1.54	1.04	0.74	0.56	0.62	0.75	1.28
0.20	1.30	1.41	0.94	0.67	0.50	0.56	0.68	1.15
0.40	1.18	1.20	0.78	0.57	0.44	0.48	0.58	0.99
0.60	0.98	0.99	0.69	0.50	0.38	0.42	0.49	0.81
0.80	0.85	0.81	0.60	0.45	0.36	0.38	0.44	0.68
1.00	0.68	0.73	0.52	0.41	0.32	0.34	0.37	0.58
1.20	0.49	0.56	0.46	0.36	0.32	0.32	0.34	0.50
1.40	0.38	0.52	0.42	0.33	0.30	0.30	0.30	0.42
1.60	0.27	0.45	0.39	0.33	0.28	0.28	0.26	0.37
1.80	0.21	0.39	0.35	0.31	0.28	0.26	0.24	0.32
2.00	0.19	0.35	0.31	0.29	0.26	0.24	0.22	0.26

P/H	North	North east	East	South east	South	South west	West	North west
0.00	1.61	1.34	1.08	0.87	0.67	0.76	0.85	1.23
0.05	1.56	1.29	0.98	0.74	0.56	0.64	0.78	1.17
0.10	1.56	1.23	0.92	0.69	0.54	0.62	0.75	1.14
0.20	1.30	1.10	0.83	0.63	0.49	0.54	0.67	1.03
0.40	1.19	0.91	0.69	0.54	0.41	0.47	0.55	0.86
0.60	0.97	0.75	0.56	0.47	0.38	0.41	0.47	0.70
0.80	0.78	0.62	0.49	0.42	0.34	0.37	0.42	0.57
1.00	0.64	0.47	0.39	0.38	0.32	0.33	0.36	0.49
1.20	0.43	0.42	0.35	0.36	0.31	0.31	0.29	0.39
1.40	0.32	0.31	0.29	0.34	0.29	0.29	0.28	0.33
1.60	0.22	0.27	0.27	0.31	0.25	0.25	0.23	0.28
1.80	0.18	0.23	0.22	0.29	0.25	0.25	0.20	0.25
2.00	0.14	0.17	0.21	0.27	0.25	0.23	0.19	0.19

P/H	North	North east	East	South east	South	South west	West	North west
0.00	3.04	2.50	1.52	1.51	1.51	1.63	1.76	2.75
0.05	2.94	2.36	1.39	1.28	1.26	1.38	1.62	2.61
0.10	2.91	2.28	1.33	1.21	1.19	1.30	1.52	2.55
0.20	2.50	2.05	1.18	1.08	1.05	1.16	1.40	2.34
0.40	2.29	1.77	1.01	0.91	0.91	0.98	1.20	1.98
0.60	1.95	1.51	0.86	0.77	0.81	0.83	1.04	1.71
0.80	1.73	1.28	0.72	0.71	0.74	0.80	0.92	1.42
1.00	1.38	1.02	0.65	0.64	0.67	0.69	0.78	1.24
1.20	1.12	0.95	0.55	0.61	0.60	0.65	0.72	1.04
1.40	0.85	0.72	0.49	0.54	0.60	0.62	0.64	0.93
1.60	0.70	0.65	0.42	0.50	0.56	0.54	0.56	0.79
1.80	0.51	0.53	0.40	0.47	0.53	0.51	0.54	0.72
2.00	0.40	0.47	0.38	0.44	0.49	0.51	0.48	0.58

P/H	North	North east	East	South east	South	South west	West	North west
0.00	1.66	1.53	0.90	0.82	0.74	0.78	0.83	1.43
0.05	1.61	1.47	0.83	0.69	0.61	0.66	0.76	1.37
0.10	1.61	1.44	0.79	0.64	0.59	0.62	0.73	1.34
0.20	1.51	1.34	0.73	0.58	0.53	0.55	0.66	1.22
0.40	1.30	1.17	0.63	0.49	0.44	0.47	0.55	1.07
0.60	1.19	1.02	0.54	0.43	0.40	0.41	0.48	0.91
0.80	1.02	0.88	0.48	0.39	0.36	0.37	0.43	0.79
1.00	0.93	0.78	0.44	0.34	0.34	0.33	0.37	0.67
1.20	0.73	0.66	0.37	0.32	0.32	0.31	0.33	0.60
1.40	0.66	0.64	0.36	0.30	0.29	0.29	0.30	0.46
1.60	0.51	0.46	0.32	0.28	0.27	0.25	0.28	0.43
1.80	0.42	0.44	0.26	0.26	0.27	0.25	0.25	0.37
2.00	0.31	0.37	0.26	0.24	0.25	0.25	0.22	0.31

Type of factor	Factor
Bedroom conduction weighting factor (BC)	0.43
Room type multiplier (for bedroom and unconditioned areas) (R_W)	1.00
Bedroom solar heat gain weighting factor (BS_W)	0.40
Floor factor for tiled or vinyl covered floors (H_W)	1.02
Floor factor for other than tiled or vinyl covered floors (H_W)	0.96

Type of factor	Factor
Bedroom conduction weighting factor (BC)	0.42
Room type multiplier (for bedroom and unconditioned areas) (R_W)	1.00
Bedroom solar heat gain weighting factor (BS_W)	1.28
Floor factor for tiled or vinyl covered floors (H_W)	1.02
Floor factor for other than tiled or vinyl covered floors (H_W)	0.97

Type of factor	Factor
Bedroom conduction weighting factor (BC)	0.70
Room type multiplier (for bedroom and unconditioned areas) (R_W)	1.00
Bedroom solar heat gain weighting factor (BS_W)	0.60
Floor factor for tiled or vinyl covered floors (H_W)	1.04
Floor factor for other than tiled or vinyl covered floors (H_W)	0.92

Type of factor	Factor
Bedroom conduction weighting factor (BC)	0.63
Room type multiplier (for bedroom and unconditioned areas) (R_W)	1.10
Bedroom solar heat gain weighting factor (BS_W)	0.81
Floor factor for tiled or vinyl covered floors (H_W)	1.03
Floor factor for other than tiled or vinyl covered floors (H_W)	0.93

Type of factor	Factor
Bedroom conduction weighting factor (BC)	0.81
Room type multiplier (for bedroom and unconditioned areas) (R_W)	1.00
Bedroom solar heat gain weighting factor (BS_W)	0.65
Floor factor for tiled or vinyl covered floors (H_W)	1.02
Floor factor for other than tiled or vinyl covered floors (H_W)	0.98

Type of factor	Factor
Bedroom conduction weighting factor (BC)	0.60
Room type multiplier (for bedroom and unconditioned areas) (R_W)	1.00
Bedroom solar heat gain weighting factor (BS_W)	0.51
Floor factor for tiled or vinyl covered floors (H_W)	1.03
Floor factor for other than tiled or vinyl covered floors (H_W)	0.93

Climate zone	North	North east	East	South east	South	South west	West	North west
2	1.70	1.34	0.98	0.84	0.70	0.90	1.10	1.40
3	1.30	1.10	0.90	0.95	1.00	0.95	0.90	1.10
4	1.30	1.25	1.20	1.03	0.85	0.92	0.99	1.15
5	1.20	1.15	1.10	1.05	1.00	1.05	1.10	1.15
6	1.23	1.13	1.00	1.00	1.02	1.00	1.00	1.16
7 and 8	1.40	1.25	1.10	1.00	0.90	0.95	1.00	1.20

Frame solar absorptance	Factor
≤ 0.40	0.97
> 0.40 to < 0.68	1.00
≥ 0.68	1.08

Frame solar absorptance	Factor
≤ 0.40	0.98
> 0.40 to < 0.68	1.00
≥ 0.68	1.05

Frame solar absorptance	Factor
≤ 0.40	0.99
> 0.40 to < 0.68	1.00
≥ 0.68	1.01

Frame solar absorptance	Factor
≤ 0.40	1.00
> 0.40 to < 0.68	1.00
≥ 0.68	1.01

Frame solar absorptance	Factor
≤ 0.40	0.92
> 0.40 to < 0.68	1.00
≥ 0.68	1.13

Frame solar absorptance	Factor
≤ 0.40	0.97
> 0.40 to < 0.68	1.00
≥ 0.68	1.01

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To set the minimum requirements for external winter glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

J3D11 External winter glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D11 addresses the thermal performance of external winter glazing in climate zones 2 to 8. The provision stipulates that the ratio of conductance (C_U) to solar heat gain (C_SHGC) for the glazing on each storey (including mezzanines) must not exceed the allowance outlined in Table J3D11a. To apply this provision accurately, you must refer to various additional resources:

the orientation sectors are to be determined according to Figure 13.3.2a of the ABCB Housing Provisions;
P/H values must be ascertained in accordance with Figure S37C7; and
if P/H values fall between those outlined in Tables J3D11b through J3D11g, you are to use the next highest P/H or interpolate.

This provision aims to balance the thermal performance of the glazing during the winter months, taking into account the varying conditions in different climate zones.

J3D12

External summer glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

(1) In climate zones 1 to 7, the aggregate solar heat gain of the glazing in each storey, including any mezzanine, of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building must—

not exceed the allowance resulting from multiplying the floor area of the storey, including any mezzanine, measured within the enclosing walls, by the constant C_SHGC obtained from Table J3D12a; and
be calculated in accordance with the following formula:

$(A_{1} \times S H G C_{1} \times E_{S 1} \times R_{S 1} \times F_{S 1} \times H_{S 1}) + (A_{2} \times S H G C_{2} \times E_{S 2} \times R_{S 2} \times F_{S 2} \times H_{S 2}) + . . .$

(2) In the formula at (1)(b)—

$A_{1, 2, e t c}$
= the area of each glazing element; and
$S H G C_{1, 2, e t c}$
= the Total System SHGC for each glazing element, not exceeding 0.7; and
$E_{S 1, 2, e t c}$
= the summer exposure factor for each glazing element obtained from Table J3D12b, J3D12c, J3D12d, J3D12e, J3D12f, J3D12g or J3D12h.
$R_{S 1, 2, e t c}$
= the factor obtained from Table J3D12i or Table J3D12j for each glazing element located in a bedroom or room which is not a conditioned space; and
$F_{S 1, 2, e t c}$
= the frame factor obtained from Table J3D12i or Table J3D12j for glazing element; and
$H_{S 1, 2, e t c}$
= the floor factor obtained from Table J3D12i or Table J3D12j for each glazing element.

(3) For the purpose of J3D12—

orientation sectors must be determined in accordance with Figure 13.3.2a of the ABCB Housing Provisions; and
P/H must be determined in accordance with Figure S37C7; and
for P/H between those shown in Tables J3D12b, J3D12c, J3D12d, J3D12e, J3D12f, J3D12g, J3D12h, J3D12i and J3D12j, either use the next highest P/H or interpolate.

% Ventilation opening area per m²	Climate zone 1	Climate zone 2	Climate zone 3	Climate zone 4	Climate zone 5	Climate zone 6	Climate zone 7
5% to <10%	0.0191	0.0245	0.0547	0.0506	0.0674	0.1472	0.0930
10% to <15%	0.0237	0.0532	0.0745	0.0946	0.1111	0.2969	0.2405
15% to <20%	0.0294	0.0700	0.0861	0.1203	0.1367	0.3845	0.3267
20% to 90%	0.0364	0.0819	0.0943	0.1385	0.1548	0.4466	0.3879

P/H	North	North east	East	South east	South	South west	West	North west
0.00	0.62	0.76	0.79	0.75	0.52	0.89	1.06	0.85
0.05	0.52	0.67	0.73	0.68	0.45	0.82	0.98	0.75
0.10	0.49	0.61	0.68	0.65	0.41	0.76	0.92	0.69
0.20	0.44	0.53	0.62	0.57	0.33	0.66	0.80	0.60
0.40	0.36	0.41	0.48	0.42	0.25	0.53	0.66	0.47
0.60	0.30	0.33	0.40	0.36	0.20	0.42	0.53	0.38
0.80	0.26	0.28	0.32	0.28	0.18	0.36	0.46	0.32
1.00	0.23	0.23	0.27	0.25	0.15	0.30	0.38	0.28
1.20	0.21	0.21	0.23	0.20	0.13	0.27	0.34	0.26
1.40	0.20	0.19	0.20	0.18	0.13	0.22	0.30	0.22
1.60	0.18	0.16	0.17	0.16	0.11	0.20	0.27	0.21
1.80	0.15	0.16	0.16	0.13	0.10	0.20	0.24	0.18
2.00	0.14	0.15	0.14	0.13	0.10	0.17	0.22	0.17

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To set the minimum requirements for external summer glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

J3D12 External summer glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D12 covers the thermal performance of external summer glazing in climate zones 1 to 7. The total solar heat gain from the glazing must be within certain limits, calculated based on the floor area and constants obtained from Table J3D12a.

The formula used for this calculation involves several components, each with a specific role:

area of each glazing element;
Total System SHGC for each glazing element, capped at 0.7;
summer exposure factor for each glazing element, derived from Tables J3D12b through J3D12h; and
additional factors for bedrooms and unconditioned spaces, and for framing and flooring, taken from Tables J3D12i and J3D12j.

For proper implementation:

orientation sectors are to be determined in accordance with Figure 13.3.2a of the ABCB Housing Provisions;
P/H values must be found according to Figure S37C7; and

for intermediate P/H values, either use the next highest P/H or interpolate.

J3D13

Shading of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

Where shading is required to comply with J3D11 or J3D12, it must—

be provided by an external permanent projection, such as a verandah, balcony, fixed canopy, eaves, shading hood or carport, which—
1. extends horizontally on both sides of the glazing for a distance greater than or equal to the projection distance P in Figure S37C7; or
2. provide the equivalent shading to (i) with a reveal or the like; or
be provided by an external shading device, such as a shutter, blind, vertical or horizontal building screen with blades, battens or slats, which—
1. is capable of restricting at least 80% of the summer solar radiation; and
2. if adjustable, is readily operated either manually, mechanically or electronically by the building occupants.

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To set the minimum requirements for shading of a sole-occupancy unit of a Class 2 building or Class 4 part of a building.

J3D13 Shading of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D13 comes into play when shading is necessary for compliance with either J3D11 (concerning external winter glazing) or J3D12 (pertaining to external summer glazing). The goal is to ensure effective shading solutions that contribute to energy efficiency, occupant comfort, and overall building performance.

J3D13 outlines two main types of acceptable shading solutions: external permanent projections and external shading devices.

External permanent projections examples include verandahs, balconies, fixed canopies, eaves, shading hoods, or carports. These projections must meet one of two criteria:

the external projection should extend horizontally on both sides of the glazing for a distance equal to or greater than the "projection distance P" specified in Figure S37C7 of the ABCB Housing Provisions; or
if the projection doesn't extend as described above, it should provide equivalent shading through features like reveals or similar architectural elements.

Alternatively, external shading devices such as shutters, blinds, or screens with blades, battens, or slats must be used. These devices must meet two essential criteria:

radiation restriction: The shading device must be capable of blocking or restricting at least 80% of the summer solar radiation. This ensures that the shading is effective in reducing heat gain inside the unit; and
operability: If the device is adjustable, it should be easily operable by building occupants, whether manually, mechanically, or electronically. The purpose is to allow occupants to adapt shading according to changing environmental conditions, thereby maximizing energy efficiency and comfort.

To set the minimum requirements for shading of a sole-occupancy unit of a Class 2 building or Class 4 part of a building.

J3D13 Shading of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D13 outlines two main types of acceptable shading solutions: external permanent projections and external shading devices.

External permanent projections examples include verandahs, balconies, fixed canopies, eaves, shading hoods, or carports. These projections must meet one of two criteria:

the external projection should extend horizontally on both sides of the glazing for a distance equal to or greater than the "projection distance P" specified in Figure S37C7 of the ABCB Housing Provisions; or
if the projection doesn't extend as described above, it should provide equivalent shading through features like reveals or similar architectural elements.

Alternatively, external shading devices such as shutters, blinds, or screens with blades, battens, or slats must be used. These devices must meet two essential criteria:

radiation restriction: The shading device must be capable of blocking or restricting at least 80% of the summer solar radiation. This ensures that the shading is effective in reducing heat gain inside the unit; and
operability: If the device is adjustable, it should be easily operable by building occupants, whether manually, mechanically, or electronically. The purpose is to allow occupants to adapt shading according to changing environmental conditions, thereby maximizing energy efficiency and comfort.

J3D14

Net equivalent energy usage of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

(1) The net equivalent energy usage of a sole-occupancy unit of a Class 2 building or Class 4 part of a building, calculated in accordance with (a), must not exceed the allowance calculated in accordance with (b)—

$(A \times E_{E}) + E_{P} + E_{S} - E_{R}$
, where—
1. $A$
  = the floor area factor obtained from multiplying the total floor area by the adjustment factor in Table J3D14a; and
2. $E_{E}$
  = the main space conditioning and main water heater efficiency factor obtained from the ABCB Standard for Whole-of-Home Efficiency Factors; and
3. $E_{P}$
  = the swimming pool pump energy usage in (2); and
4. $E_{S}$
  = the spa pump energy usage in (3); and
5. $E_{R}$
  = the installed capacity of on-site photovoltaics apportioned to the sole-occupancy unit of a Class 2 building or Class 4 part of a building (kW); and
$A \times E_{F}$
, where—
1. $A$
  = the floor area factor obtained from multiplying the total floor area by the adjustment factor in Table J3D14a; and
2. $E_{F}$
  = the energy factor obtained from Table J3D14b.

(2) The swimming pool pump energy usage (E_P) must be determined in accordance with the following formula:

$E_{P} = V \times F P / 1000$ , where—

$E_{P}$
= the swimming pool pump energy usage; and
$V$
= the volume of the swimming pool to the nearest 1000 litres; and
$F P$
= the swimming pool pump factor in Table 13.6.2c of the ABCB Housing Provisions.

(3) The spa pump energy usage (E_S) must be determined in accordance with the following formula:

$E_{S} = V \times F S B / 100$ ,where—

$E S$
= the spa pump energy usage; and
$V$
= the volume of the spa to the nearest 100 litres; and
$F S B$
= the spa pump factor in Table 13.6.2d of the ABCB Housing Provisions.

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To demonstrate net equivalent energy calculations of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building.

J3D14 Net equivalent energy usage of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D14 sets an energy budget for the regulated energy used in the dwelling based on its floor area and location. The energy budget is intended to reflect the operating costs that will be incurred by the occupants, assuming that the building’s fabric also meets the minimum efficiency requirements. It incorporates a consideration of broader societal costs associated with the energy use. The provision also prescribes a method to calculate the energy use of each sole-occupancy unit to compare with the budget allowance.

The components of the energy usage calculation are:

Floor area factor: Calculated by multiplying the total floor area of the unit by an adjustment factor from Table J3D14a.
Main space and water heater efficiency: Obtained from the ABCB Standard for Whole-of-Home Efficiency Factors.
Swimming pool pump energy usage: Defined in J3D14(2) and based on swimming pool volume and a factor from Table 13.6.2c of the ABCB Housing Provisions. Only swimming pools dedicated to the individual sole-occupancy unit are considered, not common-area swimming pools.
Spa pump energy usage: Defined in J3D14(3) and based on spa volume and a factor from Table 13.6.2d of the ABCB Housing Provisions. Only spas dedicated to the individual sole-occupancy unit are considered, not common-area spas.
Installed photovoltaic capacity: The installed photovoltaic (solar panel) capacity allocated to the unit.

J3D15

Net equivalent energy usage for a sole-occupancy unit of a Class 2 building or Class 4 part of building – home energy rating software

New for 2022

A sole-occupancy unit of a Class 2 building or a Class 4 part of a building must achieve a whole-of-home rating of not less than 50 using house energy rating software.

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To demonstrate net equivalent energy usage with home energy rating software.

J3D15 Net equivalent energy usage for a sole-occupancy unit of a Class 2 building or Class 4 part of building – home energy rating software

J3D15 states that a sole-occupancy unit of a Class 2 building or Class 4 part of a building must achieve a whole-of-home rating of 50 or more when evaluated using house energy rating software. This software-based approach simplifies the process of assessing a unit's energy performance by using a comprehensive model to evaluate various parameters affecting energy consumption.

Opaque external wall to net floor area ratio	Shading device overhang (mm)
Opaque external wall to net floor area ratio	≥ 0 to < 600	≥ 600 to < 900	≥ 900 to < 1200	≥ 1200
< 20%	Any	Any	≥ 0.4	X
≥ 20% to < 35%	Any	Any	X	X
≥ 35% to < 45%	Any	≥ 0.4	X	X
≥ 45%	Any	≥ 0.6	X	X

P/H	North	North east	East	South east	South	South west	West	North west
0.00	2.18	2.75	2.88	2.22	1.59	2.46	2.91	2.90
0.05	1.85	2.47	2.63	1.99	1.35	2.25	2.70	2.64
0.10	1.69	2.30	2.48	1.89	1.27	2.13	2.60	2.43
0.20	1.35	1.96	2.20	1.66	1.14	1.92	2.33	2.13
0.40	0.94	1.48	1.78	1.38	0.94	1.57	1.87	1.61
0.60	0.78	1.10	1.53	1.15	0.81	1.36	1.58	1.19
0.80	0.68	0.89	1.25	0.97	0.68	1.17	1.37	0.94
1.00	0.57	0.74	1.05	0.82	0.60	0.98	1.16	0.84
1.20	0.52	0.61	0.93	0.74	0.60	0.91	1.00	0.68
1.40	0.47	0.56	0.80	0.66	0.49	0.80	0.87	0.61
1.60	0.42	0.48	0.70	0.61	0.47	0.73	0.79	0.49
1.80	0.39	0.46	0.65	0.56	0.44	0.66	0.71	0.47
2.00	0.36	0.43	0.60	0.54	0.44	0.61	0.64	0.40

Factor	Value
Room type multiplier (for bedroom and unconditioned areas) (R_S)	0.32
Frame solar absorptance multiplier Frame SA = 0.3 up to 0.4 (F_S)	0.83
Frame solar absorptance multiplier Frame SA = 0.4 up to 0.5 (F_S)	1.00
Frame solar absorptance multiplier Frame SA = 0.5 or more (F_S)	1.20
Floor factor for tiled or vinyl covered floors (H_S)	1.00
Floor factor for other than tiled or vinyl covered floors (H_S)	1.00

Total floor area m²	Floor area factor	Total floor area m²	Floor area factor	Total floor area m²	Floor area factor	Total floor area m²	Floor area factor
< 50	0.0123	160–169	0.0097	280–289	0.0087	400–409	0.0080
50–59	0.0119	170–179	0.0096	290–299	0.0086	410–419	0.0079
60–69	0.0116	180–189	0.0095	300–309	0.0085	420–429	0.0079
70–79	0.0113	190–199	0.0094	310–319	0.0085	430–439	0.0078
80–89	0.0111	200–209	0.0093	320–329	0.0084	440–449	0.0078
90–99	0.0108	210–219	0.0092	330–339	0.0083	450–459	0.0077
100–109	0.0106	220–229	0.0091	340–349	0.0083	460–469	0.0077
110–119	0.0105	230–239	0.0090	350–359	0.0082	470–479	0.0077
120–129	0.0103	240–249	0.0090	360–369	0.0082	480–489	0.0076
130–139	0.0101	250–259	0.0089	370–379	0.0081	490–499	0.0076
140–149	0.0100	260–269	0.0088	380–389	0.0081	500	0.0075
150–159	0.0099	270–279	0.0087	390–399	0.0080	—	—

Climate zone	ACT	NSW	NT	QLD	SA	TAS	Vic	WA
1	—	—	2.73	3.95	—	—	—	4.64
2	—	1.88	—	2.54	—	—	—	—
3	—	—	1.76	3.52	—	—	—	4.10
4	—	2.57	—	—	2.65	—	1.79	3.34
5	—	2.50	—	3.26	2.56	—	—	3.36
6	—	3.43	—	—	3.58	—	2.32	4.58
7	3.66	3.32	—	—	—	4.41	2.32	—
8	—	5.70	—	—	—	5.60	4.02	—

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Part J3 Elemental provisions for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

Introduction to this Part

Notes

Notes: New South Wales Section J Energy Efficiency

Deemed-to-Satisfy Provisions

J3D1 Deemed-to-Satisfy Provisions New for 2022

State variations

J3D1 Deemed-to-Satisfy Provisions

J3D1 Deemed-to-Satisfy Provisions

J3D2 Application of Part New for 2022

State variations

J3D3 Reducing heating and cooling loads of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building using house energy rating software 2019: J0.2

State variations

J3D1 Deemed-to-Satisfy Provisions

J3D1 Deemed-to-Satisfy Provisions

J3D4 Ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building 2019: J0.3

State variations

J3D4 Ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D4 Ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D5 Roof thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building 2019: J0.4

State variations

J3D5 Roof thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D5 Roof thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D6 Wall thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building 2019: J0.5

State variations

J3D6 Wall thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D6 Wall thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D7 Roofs and ceilings of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D7 Roofs and ceilings of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D7 Roofs and ceilings of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D8 External walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D8 External walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D8 External walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D9 Wall-glazing construction of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D9 Wall-glazing construction of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D9 Wall-glazing construction of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D10 Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D10 Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D10 Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D11 External winter glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D11 External winter glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D11 External winter glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D12 External summer glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D12 External summer glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D12 External summer glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D13 Shading of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D13 Shading of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D13 Shading of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D14 Net equivalent energy usage of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building New for 2022

State variations

J3D14 Net equivalent energy usage of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D14 Net equivalent energy usage of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

J3D15 Net equivalent energy usage for a sole-occupancy unit of a Class 2 building or Class 4 part of building – home energy rating software New for 2022

State variations

J3D15 Net equivalent energy usage for a sole-occupancy unit of a Class 2 building or Class 4 part of building – home energy rating software

J3D15 Net equivalent energy usage for a sole-occupancy unit of a Class 2 building or Class 4 part of building – home energy rating software

J3D1

Deemed-to-Satisfy Provisions

New for 2022

J3D2

Application of Part

New for 2022

J3D3

Reducing heating and cooling loads of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building using house energy rating software

2019: J0.2

J3D4

Ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

2019: J0.3

J3D5

Roof thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

2019: J0.4

J3D6

Wall thermal breaks of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

2019: J0.5

J3D7

Roofs and ceilings of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D8

External walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D9

Wall-glazing construction of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D10

Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D11

External winter glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D12

External summer glazing of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D13

Shading of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D14

Net equivalent energy usage of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

New for 2022

J3D15

Net equivalent energy usage for a sole-occupancy unit of a Class 2 building or Class 4 part of building – home energy rating software

New for 2022