NCC 2019 Volume Two
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Part 3.8.7 Condensation management

Part 3.8.7 Condensation management

Appropriate Performance Requirements

Appropriate Performance Requirements

Where an alternative condensation management system is proposed as a Performance Solution to that described in Part 3.8.7, that proposal must comply with—

  1. Performance RequirementP2.4.7; and
  2. the relevant Performance Requirement determined in accordance with A2.2(3) and A2.4(3) as applicable.

State and Territory Variations

State and Territory Variations

In Tasmania insert the following Note: Refer to the guidance in the "Guide for Control of Condensation and Mould in Tasmanian Homes" that should be adhered to where possible.

In the Australian Capital Territory:

See the ACT Appendix for further information on condensation management in the ACT.

3.8.7.1 Application

Compliance with this Acceptable Construction Practice satisfies Performance Requirement P2.4.7.

Explanatory information:

Explanatory information:

The intent of these requirements is to assist in the mitigation of condensation within a building. The installation of a condensation management system may not prevent condensation from occurring.

3.8.7.2 Pliable building membrane

(a)

Where a pliable building membrane is installed in an external wall, it must—

(i)

comply with AS/NZS 4200.1; and

(ii)

be installed in accordance with AS 4200.2; and

(iii)

be a vapour permeable membrane for climate zones 6, 7 and 8; and

(iv)

be located on the exterior side of the primary insulation layer of wall assemblies that form the external envelope of a building.

(b)

Except for single skin masonry or single skin concrete, where a pliable building membraneis not installed in an external wall, the primary water control layer must be separated from water sensitive materials by a drained cavity.

3.8.7.3 Flow rate and discharge of exhaust systems

(a)

An exhaust system installed in a kitchen, bathroom, sanitary compartment or laundry must have a minimum flow rate of—

(i)

25 L/s for a bathroom or sanitary compartment; and

(ii)

40 L/s for a kitchen or laundry.

(b)

Exhaust from a bathroom, sanitary compartment, or laundry must be discharged—

(i)

directly or via a shaft or duct to outdoor air; or

(ii)

to a roof space that is ventilated in accordance with 3.8.7.4.

3.8.7.4 Ventilation of roof spaces

(a)

Where an exhaust system covered by 3.8.7.3 discharges into a roof space, the roof space must be ventilated to outdoor air through evenly distributed openings.

(b)

Openings required by (a) must have a total unobstructed area of 1/300 of the respective ceiling area if the roof pitch is more than 22°, or 1/150 of the respective ceiling area if the roof pitch is not more than 22°.

(c)

30% of the total unobstructed area required by (b) must be located not more than 900 mm below the ridge or highest point of the roof space, measured vertically, with the remaining required area provided by eave vents.