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J3
Part J3 Elemental provisions for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building
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
- 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.
NSW J3D1 Deemed-to-Satisfy ProvisionsNew for 2022
- NSW J2D2; and
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 of a sole-occupancy unit of a Class 2 building and a Class 4 part of a building.
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.
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
- for reducing the heating or cooling loads—
- collectively achieve an average energy rating of not less than 7 stars, including the separate heating and cooling load limits; and
- 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.
- house energy rating software; and
- the load limits specified in the ABCB Standard for NatHERS Heating and Cooling Load Limits.
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.
J3D4
Ceiling fans in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building
2019: J0.3
- climate zones 1, 2 and 3; and
- climate zone 5 in New South Wales and Queensland.
- 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 |
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
- 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.
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
- 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.
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
- 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—
- R3.5; or
- 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.
- 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.
- for a pitched roof with a horizontal ceiling—
- achieving the Total R-Value in Table J3D7s, calculated using a method that accounts for the effects of thermal bridging; or
- increasing the R-Value of the insulation between the ceiling frames by R0.5 more than the R-Value derived from (1); or
- 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
- 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—
- achieving the Total R-Value in Table J3D7t, calculated using a method that accounts for the effects of thermal bridging; or
- complying with Table J3D7u.
- 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.
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 |
Table Notes
- SA = solar absorptance.
- 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.
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 |
Table Notes
- SA = solar absorptance.
- A roof space is to be considered ‘vented’ if it—
- has one wind-driven roof ventilator per 50 m2 of ceiling area with gable, eave or ridge vents; or
- has one powered roof ventilator per 200 m2 of ceiling area with gable, eave or ridge vents; or
- 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 | 1.5 | 1.5 | 2.0 | 3.0 | 4.0 |
No | 1.5 | 3.5 | 5.0 | X | X |
Table Notes
- SA = solar absorptance.
- The R-Value can be achieved by installing insulation under the roof or on top of the ceiling or a combination of both.
- 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 | 2.5 | 2.5 | 3.0 | 3.5 |
No | 3.0 | 3.0 | 3.5 | 4.0 | 4.5 |
Table Notes
- SA = solar absorptance.
- 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.
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 |
Table Notes
- SA = solar absorptance.
- A roof is considered ‘vented’ if it—
- has one wind-driven roof ventilator per 50 m2 of ceiling area with gable, eave or ridge vents; or
- has one powered roof ventilator per 200 m2 of ceiling area with gable, eave or ridge vents; or
- 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.
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 |
Table Notes
- SA = solar absorptance.
- The R-Value can be achieved by installing insulation under the roof or on top of the ceiling or a combination of both.
- 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.
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 Notes
- SA = solar absorptance.
- 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.
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—
- has one wind-drive roof ventilator per 50 m2 of ceiling area with gable, eave or ridge vents; or
- has one powered roof ventilator per 200 m2 of ceiling area with gable, eave or ridge vents; or
- 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 |
Table Notes
- SA = solar absorptance.
- The R-Value can be achieved by installing insulation under the roof or on top of the ceiling or a combination of both.
- 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 | ≤ 0.64 |
---|---|
Yes | 2.0 |
No | 2.5 |
Table Notes
- SA = solar absorptance.
- 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.
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 |
Table Notes
- SA = solar absorptance.
- A roof is considered ‘vented’ if it—
- has one wind-driven roof ventilator per 50 m2 of ceiling area with gable, eave or ridge vents; or
- has one powered roof ventilator per 200 m2 of ceiling area with gable, eave or ridge vents; or
- 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.
Reflective insulation under-roof | SA ≤ 0.64 |
---|---|
Yes | 3.0 |
No | 3.5 |
Table Notes
- SA = solar absorptance.
- The R-Value can be achieved by installing insulation under the roof or on top of the ceiling or a combination of both.
- 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.
Reflective insulation under-roof | SA ≤ 0.42 | SA > 0.42 to ≤ 0.64 |
---|---|---|
Yes | 3.0 | 3.5 |
No | 4.0 | 4.0 |
Table Notes
- SA = solar absorptance.
- 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.
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 |
Table Notes
- SA = solar absorptance.
- A roof is considered ‘vented’ if it—
- has one wind-driven roof ventilator per 50 m2 of ceiling area with gable, eave or ridge vents; or
- has one powered roof ventilator per 200 m2 of ceiling area with gable, eave or ridge vents; or
- 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.
Reflective insulation under- roof | R-Value |
---|---|
Yes | 2.5 |
No | 3.0 |
Table Notes
- The R-Value can be achieved by installing insulation under the roof or on top of the ceiling or a combination of both.
- 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.
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 |
Table Notes
- SA = solar absorptance.
- 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.
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 |
Table Notes
- SA = solar absorptance.
- A roof is considered ‘vented’ if it—
- has one wind-driven roof ventilator per 50 m2 of ceiling area with gable, eave or ridge vents; or
- has one powered roof ventilator per 200 m2 of ceiling area with gable, eave or ridge vents; or
- is ventilated to outdoor air through evenly distributed openings in accordance with Table F8D5; or
- 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.
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 |
Table Notes
- SA = solar absorptance.
- The R-Value can be achieved by installing insulation under the roof or on top of the ceiling or a combination of both.
- 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 for insulation.
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 |
Table Notes
- The Total R-Value calculation only includes the ceiling frame, insulation and ceiling lining. It is not to include the internal air films, roof space or roof lining.
- Minimum ceiling Total R-Values are in-situ values. They account for compression of insulation.
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 |
Table Notes
- Minimum Total R-Values are in-situ values. They account for compression of insulation.
- Direction of heat flow must be determined in accordance with Table J3D7v.
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 |
Table Notes
- Minimum R-Values are in-situ values. They account for compression of insulation.
- X= not permitted.
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) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | |
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 |
Table Notes
- Interpolation is allowed for values between those shown.
- X = not permitted.
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 |
Table Notes
- SA = solar absorptance.
- Direction of heat flow must be determined in accordance with Table J3D7v.
- X = not permitted.
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.
J3D8
External walls of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building
New for 2022
- in climate zones 1, 2, 3, 5 and 6—
- 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
- 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
- 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.
- 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.
- 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) | |||
---|---|---|---|---|
≥ 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 |
Table Notes
X = not permitted
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
- in climate zones 1 to 5, U2.2; or
- in climate zone 6, U2.0; or
- in climate zones 7 and 8, U1.4.
- 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.
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 |
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
- in climate zone 2 and climate zones 5 to 8, R2.0; and
- in climate zones 3 and 4, R1.5.
NSW J3D10 Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a buildingNew for 2022
- 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.
NSW J3D10 Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a buildingNew for 2022
- in climate zones 6 and 7—
- in climate zone 8—
NSW J3D10 Floors of a sole-occupancy unit of a Class 2 building or a Class 4 part of a buildingNew for 2022
- be water resistant; and
- be continuous from the adjacent finished ground level—
- to a depth of not less than 300 mm; or
- for at least the full depth of the vertical edge of the concrete slab-on-ground.
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
- not exceed the allowance obtained from Table J3D11a; and
- be calculated in accordance with the following formula:
- = the area of each glazing element; and
- = the Total System U-Value of each glazing element; and
- = the Total System SHGC for each glazing element, not exceeding 0.7; and
- = the winter exposure factor for each glazing element obtained from Table J3D11b, J3D11c, J3D11d, J3D11e, J3D11f or J3D11g; and
- = the bedroom conductance factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and
- = the orientation sector conductance factor obtained from Table J3D11n; and
- = the room type factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and
- = the bedroom solar heat gain factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and
- = the frame factor obtained from Table J3D11o, J3D11p, J3D11q, J3D11r, J3D11s or J3D11t for each glazing element; and
- = the floor factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m for each glazing element.
- 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 (CU/CSHGC) |
---|---|
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) (RW) | 1.00 |
Bedroom solar heat gain weighting factor (BSW) | 0.40 |
Floor factor for tiled or vinyl covered floors (HW) | 1.02 |
Floor factor for other than tiled or vinyl covered floors (HW) | 0.96 |
Type of factor | Factor |
---|---|
Bedroom conduction weighting factor (BC) | 0.42 |
Room type multiplier (for bedroom and unconditioned areas) (RW) | 1.00 |
Bedroom solar heat gain weighting factor (BSW) | 1.28 |
Floor factor for tiled or vinyl covered floors (HW) | 1.02 |
Floor factor for other than tiled or vinyl covered floors (HW) | 0.97 |
Type of factor | Factor |
---|---|
Bedroom conduction weighting factor (BC) | 0.70 |
Room type multiplier (for bedroom and unconditioned areas) (RW) | 1.00 |
Bedroom solar heat gain weighting factor (BSW) | 0.60 |
Floor factor for tiled or vinyl covered floors (HW) | 1.04 |
Floor factor for other than tiled or vinyl covered floors (HW) | 0.92 |
Type of factor | Factor |
---|---|
Bedroom conduction weighting factor (BC) | 0.63 |
Room type multiplier (for bedroom and unconditioned areas) (RW) | 1.10 |
Bedroom solar heat gain weighting factor (BSW) | 0.81 |
Floor factor for tiled or vinyl covered floors (HW) | 1.03 |
Floor factor for other than tiled or vinyl covered floors (HW) | 0.93 |
Type of factor | Factor |
---|---|
Bedroom conduction weighting factor (BC) | 0.81 |
Room type multiplier (for bedroom and unconditioned areas) (RW) | 1.00 |
Bedroom solar heat gain weighting factor (BSW) | 0.65 |
Floor factor for tiled or vinyl covered floors (HW) | 1.02 |
Floor factor for other than tiled or vinyl covered floors (HW) | 0.98 |
Type of factor | Factor |
---|---|
Bedroom conduction weighting factor (BC) | 0.60 |
Room type multiplier (for bedroom and unconditioned areas) (RW) | 1.00 |
Bedroom solar heat gain weighting factor (BSW) | 0.51 |
Floor factor for tiled or vinyl covered floors (HW) | 1.03 |
Floor factor for other than tiled or vinyl covered floors (HW) | 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 |
Table Notes
Interpolation is allowed for values between those shown.
Frame solar absorptance | Factor |
---|---|
≤ 0.40 | 0.98 |
> 0.40 to < 0.68 | 1.00 |
≥ 0.68 | 1.05 |
Table Notes
Interpolation is allowed for values between those shown.
Frame solar absorptance | Factor |
---|---|
≤ 0.40 | 0.99 |
> 0.40 to < 0.68 | 1.00 |
≥ 0.68 | 1.01 |
Table Notes
Interpolation is allowed for values between those shown.
Frame solar absorptance | Factor |
---|---|
≤ 0.40 | 1.00 |
> 0.40 to < 0.68 | 1.00 |
≥ 0.68 | 1.01 |
Table Notes
Interpolation is allowed for values between those shown.
Frame solar absorptance | Factor |
---|---|
≤ 0.40 | 0.92 |
> 0.40 to < 0.68 | 1.00 |
≥ 0.68 | 1.13 |
Table Notes
Interpolation is allowed for values between those shown.
Frame solar absorptance | Factor |
---|---|
≤ 0.40 | 0.97 |
> 0.40 to < 0.68 | 1.00 |
≥ 0.68 | 1.01 |
Table Notes
Interpolation is allowed for values between those shown.
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 (CU) to solar heat gain (CSHGC) 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
- not exceed the allowance resulting from multiplying the floor area of the storey, including any mezzanine, measured within the enclosing walls, by the constant CSHGC obtained from Table J3D12a; and
- be calculated in accordance with the following formula:
- = the area of each glazing element; and
- = the Total System SHGC for each glazing element, not exceeding 0.7; and
- = the summer exposure factor for each glazing element obtained from Table J3D12b, J3D12c, J3D12d, J3D12e, J3D12f, J3D12g or J3D12h.
- = 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
- = the frame factor obtained from Table J3D12i or Table J3D12j for glazing element; and
- = the floor factor obtained from Table J3D12i or Table J3D12j for each glazing element.
- 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 |
Table Notes
- The ventilation opening area is the total area of each ventilation opening divided by the floor area of the storey, including any mezzanine.
- No window can have a design ventilation opening greater than 90% because the window frame will always obstruct some area of the opening.
- Interpolation is allowed for values between those shown.
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 |
P/H | North | North east | East | South east | South | South west | West | North west |
---|---|---|---|---|---|---|---|---|
0.00 | 0.65 | 1.16 | 1.59 | 1.20 | 0.73 | 1.30 | 1.77 | 1.23 |
0.05 | 0.54 | 1.01 | 1.43 | 1.06 | 0.61 | 1.18 | 1.62 | 1.10 |
0.10 | 0.50 | 0.94 | 1.35 | 0.99 | 0.58 | 1.10 | 1.50 | 1.00 |
0.20 | 0.42 | 0.81 | 1.20 | 0.88 | 0.51 | 0.98 | 1.32 | 0.87 |
0.40 | 0.35 | 0.62 | 0.95 | 0.70 | 0.40 | 0.78 | 1.10 | 0.67 |
0.60 | 0.30 | 0.48 | 0.78 | 0.57 | 0.33 | 0.64 | 0.88 | 0.50 |
0.80 | 0.26 | 0.41 | 0.65 | 0.47 | 0.29 | 0.54 | 0.77 | 0.43 |
1.00 | 0.23 | 0.33 | 0.56 | 0.40 | 0.24 | 0.47 | 0.62 | 0.36 |
1.20 | 0.21 | 0.30 | 0.46 | 0.35 | 0.22 | 0.40 | 0.54 | 0.31 |
1.40 | 0.19 | 0.26 | 0.42 | 0.32 | 0.21 | 0.35 | 0.48 | 0.27 |
1.60 | 0.17 | 0.25 | 0.36 | 0.29 | 0.19 | 0.31 | 0.41 | 0.24 |
1.80 | 0.15 | 0.22 | 0.31 | 0.25 | 0.17 | 0.30 | 0.37 | 0.22 |
2.00 | 0.15 | 0.21 | 0.29 | 0.24 | 0.16 | 0.26 | 0.36 | 0.21 |
P/H | North | North east | East | South east | South | South west | West | North west |
---|---|---|---|---|---|---|---|---|
0.00 | 0.80 | 1.26 | 1.41 | 1.38 | 0.89 | 1.33 | 1.29 | 1.20 |
0.05 | 0.67 | 1.14 | 1.31 | 1.26 | 0.77 | 1.21 | 1.20 | 1.07 |
0.10 | 0.63 | 1.03 | 1.24 | 1.19 | 0.73 | 1.14 | 1.13 | 0.99 |
0.20 | 0.54 | 0.88 | 1.09 | 1.05 | 0.62 | 1.00 | 1.01 | 0.87 |
0.40 | 0.46 | 0.68 | 0.87 | 0.83 | 0.51 | 0.83 | 0.80 | 0.67 |
0.60 | 0.40 | 0.52 | 0.73 | 0.68 | 0.42 | 0.66 | 0.67 | 0.52 |
0.80 | 0.34 | 0.42 | 0.58 | 0.55 | 0.36 | 0.58 | 0.57 | 0.42 |
1.00 | 0.29 | 0.35 | 0.50 | 0.47 | 0.32 | 0.49 | 0.50 | 0.35 |
1.20 | 0.27 | 0.31 | 0.42 | 0.40 | 0.28 | 0.43 | 0.41 | 0.31 |
1.40 | 0.24 | 0.27 | 0.35 | 0.36 | 0.27 | 0.37 | 0.39 | 0.27 |
1.60 | 0.24 | 0.24 | 0.33 | 0.32 | 0.22 | 0.36 | 0.33 | 0.25 |
1.80 | 0.21 | 0.23 | 0.30 | 0.28 | 0.22 | 0.32 | 0.31 | 0.23 |
2.00 | 0.21 | 0.22 | 0.25 | 0.28 | 0.20 | 0.28 | 0.26 | 0.20 |
P/H | North | North east | East | South east | South | South west | West | North west |
---|---|---|---|---|---|---|---|---|
0.00 | 0.79 | 1.13 | 1.12 | 1.05 | 0.68 | 1.14 | 1.44 | 1.23 |
0.05 | 0.67 | 1.05 | 1.05 | 0.97 | 0.59 | 1.05 | 1.34 | 1.12 |
0.10 | 0.62 | 0.95 | 0.99 | 0.91 | 0.55 | 0.98 | 1.29 | 1.03 |
0.20 | 0.47 | 0.83 | 0.90 | 0.82 | 0.49 | 0.87 | 1.16 | 0.89 |
0.40 | 0.33 | 0.63 | 0.74 | 0.67 | 0.41 | 0.71 | 0.94 | 0.68 |
0.60 | 0.30 | 0.48 | 0.59 | 0.56 | 0.35 | 0.61 | 0.79 | 0.50 |
0.80 | 0.26 | 0.36 | 0.50 | 0.49 | 0.30 | 0.52 | 0.65 | 0.40 |
1.00 | 0.22 | 0.29 | 0.44 | 0.42 | 0.26 | 0.45 | 0.56 | 0.33 |
1.20 | 0.21 | 0.25 | 0.37 | 0.37 | 0.24 | 0.40 | 0.50 | 0.28 |
1.40 | 0.18 | 0.22 | 0.31 | 0.34 | 0.20 | 0.38 | 0.42 | 0.23 |
1.60 | 0.18 | 0.19 | 0.30 | 0.30 | 0.19 | 0.33 | 0.36 | 0.22 |
1.80 | 0.15 | 0.17 | 0.26 | 0.27 | 0.17 | 0.29 | 0.35 | 0.19 |
2.00 | 0.14 | 0.16 | 0.22 | 0.23 | 0.17 | 0.28 | 0.29 | 0.18 |
P/H | North | North east | East | South east | South | South west | West | North west |
---|---|---|---|---|---|---|---|---|
0.00 | 0.82 | 1.20 | 1.31 | 1.06 | 0.82 | 1.04 | 1.30 | 1.16 |
0.05 | 0.69 | 1.06 | 1.18 | 0.94 | 0.68 | 0.92 | 1.19 | 1.04 |
0.10 | 0.63 | 0.97 | 1.11 | 0.87 | 0.65 | 0.86 | 1.11 | 0.94 |
0.20 | 0.51 | 0.84 | 0.98 | 0.77 | 0.58 | 0.76 | 0.99 | 0.83 |
0.40 | 0.39 | 0.64 | 0.78 | 0.63 | 0.46 | 0.62 | 0.81 | 0.62 |
0.60 | 0.35 | 0.51 | 0.64 | 0.52 | 0.40 | 0.51 | 0.65 | 0.48 |
0.80 | 0.30 | 0.41 | 0.55 | 0.44 | 0.34 | 0.43 | 0.52 | 0.40 |
1.00 | 0.26 | 0.34 | 0.46 | 0.37 | 0.30 | 0.37 | 0.46 | 0.31 |
1.20 | 0.24 | 0.29 | 0.40 | 0.33 | 0.26 | 0.33 | 0.40 | 0.27 |
1.40 | 0.21 | 0.25 | 0.35 | 0.30 | 0.24 | 0.29 | 0.34 | 0.24 |
1.60 | 0.20 | 0.24 | 0.32 | 0.25 | 0.22 | 0.27 | 0.30 | 0.21 |
1.80 | 0.18 | 0.22 | 0.28 | 0.23 | 0.20 | 0.23 | 0.27 | 0.20 |
2.00 | 0.17 | 0.19 | 0.26 | 0.23 | 0.19 | 0.21 | 0.25 | 0.19 |
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 |
P/H | North | North east | East | South east | South | South west | West | North west |
---|---|---|---|---|---|---|---|---|
0.00 | 0.89 | 1.06 | 1.06 | 0.93 | 0.70 | 0.91 | 1.06 | 1.07 |
0.05 | 0.77 | 0.95 | 0.97 | 0.82 | 0.59 | 0.81 | 0.97 | 0.97 |
0.10 | 0.71 | 0.88 | 0.92 | 0.79 | 0.56 | 0.76 | 0.92 | 0.89 |
0.20 | 0.58 | 0.77 | 0.82 | 0.69 | 0.50 | 0.68 | 0.81 | 0.78 |
0.40 | 0.37 | 0.59 | 0.67 | 0.57 | 0.42 | 0.55 | 0.66 | 0.58 |
0.60 | 0.30 | 0.46 | 0.57 | 0.50 | 0.36 | 0.47 | 0.56 | 0.46 |
0.80 | 0.26 | 0.36 | 0.48 | 0.44 | 0.31 | 0.41 | 0.47 | 0.36 |
1.00 | 0.23 | 0.30 | 0.42 | 0.37 | 0.28 | 0.35 | 0.39 | 0.29 |
1.20 | 0.20 | 0.25 | 0.36 | 0.34 | 0.25 | 0.31 | 0.34 | 0.25 |
1.40 | 0.18 | 0.21 | 0.32 | 0.30 | 0.23 | 0.28 | 0.29 | 0.22 |
1.60 | 0.17 | 0.19 | 0.29 | 0.27 | 0.22 | 0.26 | 0.28 | 0.19 |
1.80 | 0.16 | 0.18 | 0.25 | 0.24 | 0.20 | 0.24 | 0.24 | 0.17 |
2.00 | 0.15 | 0.17 | 0.24 | 0.23 | 0.20 | 0.21 | 0.22 | 0.16 |
Factor | Value |
---|---|
Room type multiplier (for bedroom and unconditioned areas) (RS) | 0.32 |
Frame solar absorptance multiplier Frame SA = 0.3 up to 0.4 (FS) | 0.83 |
Frame solar absorptance multiplier Frame SA = 0.4 up to 0.5 (FS) | 1.00 |
Frame solar absorptance multiplier Frame SA = 0.5 or more (FS) | 1.20 |
Floor factor for tiled or vinyl covered floors (HS) | 1.00 |
Floor factor for other than tiled or vinyl covered floors (HS) | 1.00 |
Type of factor | Climate zone 2 | Climate zone 3 | Climate zone 4 | Climate zone 5 | Climate zone 6 | Climate zone 7 |
---|---|---|---|---|---|---|
Room type multiplier (for bedroom and unconditioned areas) (RS) | 0.40 | 0.56 | 0.71 | 0.91 | 0.87 | 1.11 |
Frame solar absorptance multiplier (for metal frame windows) (FS) SA ≤ 0.40 | 1.00 | 0.89 | 0.87 | 0.85 | 0.74 | 0.86 |
Frame solar absorptance multiplier (for metal frame windows) (FS) SA > 0.40 to < 0.68 | 1.06 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
Frame solar absorptance multiplier (for metal frame windows) (FS) SA ≥ 0.68 | 1.22 | 1.18 | 1.22 | 1.24 | 1.22 | 1.32 |
Floor factor for tiled or vinyl covered floors (HS) | 1.06 | 1.06 | 1.13 | 1.13 | 1.04 | 1.21 |
Floor factor for other than tiled or vinyl covered floors (HS) | 0.97 | 0.97 | 0.94 | 0.94 | 0.94 | 0.90 |
Table Notes
Interpolation is allowed for values between those shown.
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—
- extends horizontally on both sides of the glazing for a distance greater than or equal to the projection distance P in Figure S37C7; or
- 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—
- is capable of restricting at least 80% of the summer solar radiation; and
- if adjustable, is readily operated either manually, mechanically or electronically by the building occupants.
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.
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
-
, where—
- = the floor area factor obtained from multiplying the total floor area by the adjustment factor in Table J3D14a; and
- = the main space conditioning and main water heater efficiency factor obtained from the ABCB Standard for Whole-of-Home Efficiency Factors; and
- = the swimming pool pump energy usage in (2); and
- = the spa pump energy usage in (3); and
- = 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
-
, where—
- = the floor area factor obtained from multiplying the total floor area by the adjustment factor in Table J3D14a; and
- = the energy factor obtained from Table J3D14b.
- = the swimming pool pump energy usage; and
- = the volume of the swimming pool to the nearest 1000 litres; and
- = the swimming pool pump factor in Table 13.6.2c of the ABCB Housing Provisions.
- = the spa pump energy usage; and
- = the volume of the spa to the nearest 100 litres; and
- = the spa pump factor in Table 13.6.2d of the ABCB Housing Provisions.
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 | — | — |
Table Notes
- The total floor area is measured within the inside face of the external walls of the sole-occupancy unit and includes any conditioned attached Class 10a building.
- Where values fall between ranges given, the floor area must be rounded up to the nearest whole square metres of floor area.
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 | — |
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.
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.