It may not always be possible to determine this just by the packaging on the vapour barrier and damp-proofing membrane, if indeed it does have packaging. The NCC requires a vapour barrier be a nominal 0.2mm thick (or 200 µm, which is the thickness in microns) polyethylene film, be medium impact resistant and be branded continuously “AS 2870 Concrete underlay, 0.2mm Medium impact resistance”. There is also a requirement to determine the resistance to puncture and moisture penetration which relates to penetration resistance to falling aggregate that will occur when the slab is poured.
Australian standard as2870 pdf download how to#
The standard goes on to provide methods to determine the required properties of the material including the average thickness of the film and how to determine the required impact resistance for medium and high impact and the vapour permeance test. The NCC also references AS 2870 the Australian Standard for residential slabs and footings which also provides information in relation to the required impact resistance and thickness of the vapour barrier and moisture penetration resistance.
The NCC nominates the required material and thickness and the impact resistant level for the barrier and the resistance to puncture and moisture penetration and also that the barrier be continuously branded for easy identification. NCC requirements related to vapour barriersĪs stated above, a vapour barrier is required by the NCC under slab-on-ground construction for all Class 1 buildings and Class 10 buildings where the slab is a continuation of the Class 1 slab. This information sheet has been prepared to assist practitioners to understand the requirements related to vapour barriers and damp-proofing membranes and what product technical information you should be looking for to ensure the products you are using comply with the NCC and relevant Australian Standards.
The NCC has specific requirements in relation to the material you must use for a vapour barrier and damp-proofing membrane, but are you aware of the requirements and does the product you are using meet these requirements?
Australian standard as2870 pdf download code#
A vapour barrier is required by the National Construction Code (NCC) Volume Two under slab-on-ground construction for all Class 1 buildings and Class 10 buildings where the slab is a continuation of the Class 1 slab.
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