NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings
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J5

Part J5 Building sealing

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

  1. 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.
  2. 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.
  3. 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.
  4. For a Class 3 building or Class 5 to 9 building:
    1. 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.
    2. 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

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

  1. J2D2; and
  2. J3D2 to J3D15; and
  3. J4D2 to J4D7; and
  4. J5D2 to J5D8; and
  5. J6D2 to J6D13; and
  6. J7D2 to J7D9; and
  7. J8D2 to J8D4; and
  8. J9D2 to J9D5.

NSW J5D1 Deemed-to-Satisfy Provisions2019: J3.0

Delete subclause J5D1(1) and insert J5D1(1) as follows:

(1) Where a Deemed-to-Satisfy Solution is proposed, Performance Requirements NSW J1P1 to NSW J1P7 are satisfied by complying with—

  1. NSW J2D2; and
  1. NSW J3D2 to J3D10; and
  2. NSW J4D2 to J4D7; and
  3. NSW J5D2 to J5D8; and
  4. NSW J6D2 to J6D13; and
  5. NSW J7D2 to J7D9; and
  6. J8D2 to NSW J8D4; and
  7. 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.

NCC Blurbs

The Deemed-to-Satisfy Provisions of this Part apply to elements forming the envelope of a Class 2 to 9 building, other than—

  1. a building in climate zones 1, 2, 3 and 5 where the only means of air-conditioning is by using an evaporative cooler; or
  2. 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
  3. 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
  4. parts of buildings that cannot be fully enclosed.
NCC Title

Application of Part

NCC State
NSW
NCC Variation Type
Replacement
NCC SPTC Current
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—

  1. a building in climate zones 1, 2, 3 and 5 where the only means of air-conditioning is by using an evaporative cooler; or
  2. 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
  3. a building or space where the mechanical ventilation required by Part F6 provides sufficient pressurisation to prevent infiltration.

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.

(1) A roof light must be sealed, or capable of being sealed, when serving—

  1. a conditioned space; or
  2. a habitable room in climate zones 4, 5, 6, 7 or 8.

(2) A roof light required by (1) to be sealed, or capable of being sealed, must be constructed with—

  1. an imperforate ceiling diffuser or the like installed at the ceiling or internal lining level; or
  2. a weatherproof seal; or
  3. a shutter system readily operated either manually, mechanically or electronically by the occupant.
NCC Blurbs

(1) A door, openable window or the like must be sealed—

  1. when forming part of the envelope; or
  2. in climate zones 4, 5, 6, 7 or 8.

(2) The requirements of (1) do not apply to—

  1. a window complying with AS 2047; or
  2. a fire door or smoke door; or
  3. a roller shutter door, roller shutter grille or other security door or device installed only for out-of-hours security.

(3) A seal to restrict air infiltration—

  1. for the bottom edge of a door, must be a draft protection device; and
  2. 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.

(4) An entrance to a building, if leading to a conditioned space must have an airlock, self-closing door, rapid roller door, revolving door or the like, other than—

  1. where the conditioned space has a floor area of not more than 50 m2; or
  2. where a café, restaurant, open front shop or the like has—
    1. a 3 m deep un-conditioned zone between the main entrance, including an open front, and the conditioned space; and
    2. at all other entrances to the café, restaurant, open front shop or the like, self-closing doors.

(5) A loading dock entrance, if leading to a conditioned space, must be fitted with a rapid roller door or the like.

Applications

NSW J5D5(5) does not apply to a Class 2 building or a Class 4 part of a building.

NCC Title

Windows and doors

NCC State
NSW
NCC Variation Type
Replacement
NCC SPTC Current
Windows and doors

(1) A door, openable window or the like must be sealed—

  1. when forming part of the envelope; or
  2. in climate zones 4, 5, 6, 7 or 8.

(2) The requirements of (1) do not apply to—

  1. a window complying with AS 2047; or
  2. a fire door or smoke door; or
  3. a roller shutter door, roller shutter grille or other security door or device installed only for out-of-hours security.

(3) A seal to restrict air infiltration—

  1. for the bottom edge of a door, must be a draft protection device; and
  2. 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.

(4) An entrance to a building, if leading to a conditioned space must have an airlock, self-closing door, rapid roller door, revolving door or the like, other than—

  1. where the conditioned space has a floor area of not more than 50 m2; or
  2. where a café, restaurant, open front shop or the like has—
    1. a 3 m deep un-conditioned zone between the main entrance, including an open front, and the conditioned space; and
    2. at all other entrances to the café, restaurant, open front shop or the like, self-closing doors.

(5) A loading dock entrance, if leading to a conditioned space, must be fitted with a rapid roller door or the like.

An exhaust fan must be fitted with a sealing device such as a self-closing damper or the like when serving—

  1. a conditioned space; or
  2. a habitable room in climate zones 4, 5, 6, 7 or 8.

(1) Ceilings, walls, floors and any opening such as a window frame, door frame, roof light frame or the like must be constructed to minimise air leakage in accordance with (2)—

  1. when forming part of the envelope; or
  2. in climate zones 4, 5, 6, 7 or 8.

(2) Construction required by (1) must be—

  1. enclosed by internal lining systems that are close fitting at ceiling, wall and floor junctions; or
  2. sealed at junctions and penetrations with—
    1. close fitting architrave, skirting or cornice; or
    2. expanding foam, rubber compressible strip, caulking or the like.

(3) The requirements of (1) do not apply to openings, grilles or the like required for smoke hazard management.

An evaporative cooler must be fitted with a self-closing damper or the like—

  1. when serving a heated space; or
  2. in climate zones 4, 5, 6, 7 or 8.