Part J5 Building sealing
Introduction to this Part
This Part contains Deemed-to-Satisfy Provisions for compliance with Part J1. It sets out provisions for the sealing of a building’s glazing, doors, exhaust fans and the like in order to increase thermal comfort for occupants and reduce the energy consumption of any installed air-conditioning systems.
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.
- For a Class 3 building or Class 5 to 9 building:
- From 1 May 2023 to 30 September 2023 NSW 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: Tasmania Section J Energy Efficiency
In Tasmania, for a Class 2 building and Class 4 part of a building, Section J is replaced with Section J of BCA 2019 Amendment 1.
Deemed-to-Satisfy Provisions
J5D1
Deemed-to-Satisfy Provisions
2019: J3.0
- 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 J5D1 Deemed-to-Satisfy Provisions2019: J3.0
- NSW J2D2; and
J5D2
Application of Part
2019: J3.1
The Deemed-to-Satisfy Provisions of this Part apply to elements forming the envelope of a Class 2 to 9 building, other than—
- a building in climate zones 1, 2, 3 and 5 where the only means of air-conditioning is by using an evaporative cooler; or
- a permanent building opening, in a space where a gas appliance is located, that is necessary for the safe operation of a gas appliance; or
- in a Class 3 or Class 5 to 9 building, a building or space where the mechanical ventilation required by Part F6 provides sufficient pressurisation to prevent infiltration; or
- parts of buildings that cannot be fully enclosed.
Application of Part
The Deemed-to-Satisfy Provisions of this Part apply to elements forming the envelope of a Class 2 to 9 building, other than—
- a building in climate zones 1, 2, 3 and 5 where the only means of air-conditioning is by using an evaporative cooler; or
- a permanent building opening, in a space where a gas appliance is located, that is necessary for the safe operation of a gas appliance; or
- a building or space where the mechanical ventilation required by Part F6 provides sufficient pressurisation to prevent infiltration.
J5D3
Chimneys and flues
2019: J3.2
The chimney or flue of an open solid-fuel burning appliance must be provided with a damper or flap that can be closed to seal the chimney or flue.
J5D4
Roof lights
2019: J3.3
- a conditioned space; or
- a habitable room in climate zones 4, 5, 6, 7 or 8.
- an imperforate ceiling diffuser or the like installed at the ceiling or internal lining level; or
- a weatherproof seal; or
- a shutter system readily operated either manually, mechanically or electronically by the occupant.
J5D5
Windows and doors
2019: J3.4
- when forming part of the envelope; or
- in climate zones 4, 5, 6, 7 or 8.
- a window complying with AS 2047; or
- a fire door or smoke door; or
- a roller shutter door, roller shutter grille or other security door or device installed only for out-of-hours security.
- for the bottom edge of a door, must be a draft protection device; and
- for the other edges of a door or the edges of an openable window or other such opening, may be a foam or rubber compression strip, fibrous seal or the like.
- where the conditioned space has a floor area of not more than 50 m2; or
- where a café, restaurant, open front shop or the like has—
- a 3 m deep un-conditioned zone between the main entrance, including an open front, and the conditioned space; and
- at all other entrances to the café, restaurant, open front shop or the like, self-closing doors.
Applications
NSW J5D5(5) does not apply to a Class 2 building or a Class 4 part of a building.
Windows and doors
- when forming part of the envelope; or
- in climate zones 4, 5, 6, 7 or 8.
- a window complying with AS 2047; or
- a fire door or smoke door; or
- a roller shutter door, roller shutter grille or other security door or device installed only for out-of-hours security.
- for the bottom edge of a door, must be a draft protection device; and
- for the other edges of a door or the edges of an openable window or other such opening, may be a foam or rubber compression strip, fibrous seal or the like.
- where the conditioned space has a floor area of not more than 50 m2; or
- where a café, restaurant, open front shop or the like has—
- a 3 m deep un-conditioned zone between the main entrance, including an open front, and the conditioned space; and
- at all other entrances to the café, restaurant, open front shop or the like, self-closing doors.
J5D6
Exhaust fans
2019: J3.5
An exhaust fan must be fitted with a sealing device such as a self-closing damper or the like when serving—
- a conditioned space; or
- a habitable room in climate zones 4, 5, 6, 7 or 8.
J5D7
Construction of ceilings, walls and floors
2019: J3.6
- when forming part of the envelope; or
- in climate zones 4, 5, 6, 7 or 8.
- enclosed by internal lining systems that are close fitting at ceiling, wall and floor junctions; or
- sealed at junctions and penetrations with—
- close fitting architrave, skirting or cornice; or
- expanding foam, rubber compressible strip, caulking or the like.
J5D8
Evaporative coolers
2019: J3.7
An evaporative cooler must be fitted with a self-closing damper or the like—
- when serving a heated space; or
- in climate zones 4, 5, 6, 7 or 8.