Bathroom Standards Australia
comply with AS 3740.
Table 3.8.1.1 Waterproofing and water resistance requirements for building elements in wet areas
Vessels or area where the fixture is installed | Floors and horizontal surfaces | Walls | Wall junctions and joints | Wall / floor junctions | Penetrations |
Shower area (enclosed and unenclosed) | |||||
With hob | Waterproof floor in shower area (including any hob or step-down) |
| Waterproof wall junctions within shower area . | Waterproof wall / floor junctions within shower area . | Waterproof penetrations in shower area . |
With step-down | |||||
Without hob or step-down | |||||
With preformed shower base | N/A | Water resistant walls in shower area to not less than 1800 mm above finished floor level of the show. | Waterproof wall junctions within shower area . | Waterproof wall / floor junctions within shower area . | Waterproof penetrations in shower area . |
Area outside shower area | |||||
For concrete and compressed fibre-cement sheet flooring | Water resistant floor of the room. | N/A | N/A | Waterproof wall / floor junctions | N/A |
For timber floors including particleboard, plywood and other timber based flooring materials | Waterproof floor of the room | ||||
Areas adjacent to baths and spas | |||||
For concrete and compressed fibre-cement sheet flooring | Water resistant floor of the room. |
| Water resistant junctions within 150 mm above a vessel for the extent of the vessel . | Water resistant wall / floor junctions for the extent of the vessel. | Waterproof tap and spout penetrations where they occur in horizontal surfaces. |
For timber floors including particleboard, plywood and other timber based flooring materials | Waterproof floor of the room. |
| Water resistant junctions within 150 mm above a vessel for the extent of the vessel . | Water resistant wall / floor junctions for the extent of the vessel. | Waterproof tap and spout penetrations where they occur in horizontal surfaces. |
Inserted baths and spas |
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| N/A | Waterproof tap and spout penetrations where they occur in horizontal surfaces. |
Other areas | |||||
Laundries and WCs | Water resistant floor of the room | N/A | N/A | Water resistant wall / floor junctions. | N/A |
Walls adjoining other vessels (e.g. sink, basin or laundry tub | N/A | Water resistant to a height of not less than 150 mm above the vessel, for the extent of the vessel, where the vessel is within 75 mm of a wall. | Waterproof wall junctions where a vessel is fixed to a wall. | N/A | Waterproof tap and spout penetrations where they occur in surfaces required to be waterproof or water resistant . |
Notes to Table 3.8.1.1 :
1.
N/A means not applicable.
2.
Where a shower is above a bath or spa, use requirements for shower.
State and Territory Variations
State and Territory Variations
State and Territory variations
In South Australia delete 3.8.1.2 and insert SA 3.8.1.2 as follows:
Building elements in wet areas within a building must—
- be waterproof or water resistant in accordance with Table 3.8.1.1, except that—
- in any room containing a washing machine, the wall area from finished floor level to a minimum of 75 mm above and 75 mm each side of the washing machine tap outlets must be water resistant; and
- where a vessel is inset into a bench top in a kitchen, bar area, kitchenette or domestic food and beverage preparation area—
- wall junctions and joints within 150 mm above the vessel must be water resistant for the extent of the vessel; and
- the perimeter edges of the vessel must be water resistant for the extent of the vessel (see Figure SA 3.8.1.2); and
- penetrations in horizontal surfaces for tap and spout outlets in kitchens, bar areas, kitchenettes or domestic food and beverage preparation areas, must be waterproof; and
- comply with AS 3740; and
- have floor wastes provided in accordance with SA 3.2.2.
- where floor wastes are provided for drainage of floors in bathrooms and laundries, the floors, floor/wall junction and penetration must be waterproof.
Figure SA 3.8.1.2 |
Typical water resistant junctions and joints for bench tops with inset vessels and vessels abutting walls |
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Source: https://ncc.abcb.gov.au/editions/2019-a1/ncc-2019-volume-two-amendment-1/part-38-health-and-amenity/part-381-wet-areas-and
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