Part F6 Condensation management (DtS)
F6.0 Deemed-to-Satisfy Provisions
To specify the minimum construction requirements to assist in the mitigation of condensation in buildings.
F6.1 Application of Part
F6.2 Pliable building membrane
comply with AS/NZS 4200.1; and
be installed in accordance with AS 4200.2; and
be a vapour permeable membrane for climate zones 6, 7 and 8; and
be located on the exterior side of the primary insulation layer of wall assemblies that form the external envelope of a building.
To set out the requirements relating to pliable building membranes that are installed as a sarking.
Sarking is considered to be a pliable building membrane. All pliable building membranes must comply with AS/NZS 4200.1 and be installed in accordance with AS 4200.2. In climate zones 6, 7 and 8 pliable building membranes must be vapour permeable to assist in the transfer of moisture from the internal to the external environment. This recognises the higher level of risk associated with the build-up of internal moisture in colder climates particularly due to the inadequate ventilation of internal spaces. Any pliable building membrane must be installed with suitable provision to allow for the drainage of accumulated condensate to a drainage point external to the wall.
Where a pliable building membrane is not installed a drained cavity must be provided. Alternatively, a design can be assessed using Verification Method FV1.1.
F6.3 Flow rate and discharge of exhaust systems
Exhaust from a kitchen must be discharged directly or via a shaft or duct to outdoor air.
To reduce risk of condensation associated with mechanical ventilation.
F6.3 requires that kitchen, bathroom, toilet and laundry exhaust fans achieve specified minimum airflow rates. Requiring higher minimum airflow rates for laundries recognises the potential for much greater air moisture in the room and therefore the increased risk of condensation. This provision also requires that the specified exhausts discharge to the external environment or into a ventilated roof space in accordance with F6.4.
F6.4 Ventilation of roof spaces
To set out the ventilation requirements relating to roof spaces.
F6.4 requires that a roof space be ventilated where exhausts are discharged directly into the roof space. F6.4 sets out the minimum unobstructed vented areas and locations relative to the pitch of the roof. Providing regularly distributed vents at both lower and upper levels assists in providing adequate cross flow ventilation.