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Part 3.8.1 Wet Areas And External Waterproofing

Appropriate Open link in same pagePerformance Requirements:

  1. Where an alternative system for external Open link in same pagewaterproofing a roof or external wall of a building is proposed as a Open link in same pagePerformance Solution to that described in Open link in same pagePart 3.8.1, that proposal must comply with—
    1. Open link in same pagePerformance Requirement Open link in same pageP2.2.2; and
    2. the relevant Open link in same pagePerformance Requirements determined in accordance with Open link in same page1.0.7.
  2. Where an alternative system for protecting Open link in same pagewet areas in a building is proposed as a Open link in same pagePerformance Solution to that described in Open link in same pagePart 3.8.1, that proposal must comply with—
    1. Open link in same pagePerformance Requirement Open link in same pageP2.4.1; and
    2. the relevant Open link in same pagePerformance Requirements determined in accordance with Open link in same page1.0.7.

Acceptable construction practice

Compliance with this acceptable construction practice satisfies Open link in same pagePerformance Requirements Open link in same pageP2.2.2 for external Open link in same pagewaterproofing and Open link in same pageP2.4.1 for Open link in same pagewet areas.

3.8.1.2 Wet Areas

Building elements in Open link in same pagewet areas within a building must—

(b)

comply with AS 3740.

Table 3.8.1.1 WATERPROOFING AND WATER RESISTANCE REQUIREMENTS FOR BUILDING ELEMENTS IN WET AREAS

Open link in same pageVessels 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
Open link in same pageWaterproof floor in Open link in same pageshower area (including any hob or step-down).
  1. Waterproof all walls in shower area to a height the greater of—
    1.  not less than 150 mm above floor substrate; or
    1. not less than 25 mm above maximum retained water level; and
  2. Open link in same pageWater resistant walls in shower area to not less than 1800 mm above finished floor level of the shower.
Open link in same pageWaterproof 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 Open link in same pageWater resistant walls in shower area to not less than 1800 mm above finished floor level of the shower.
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 Open link in same pageWater 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 Open link in same pageWater resistant floor of the room.
  1. Open link in same pageWater 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.
  2. Open link in same pageWater resistant all exposed surfaces below vessel lip.
Open link in same pageWater resistant junctions within 150 mm above a vessel for the extent of the vessel. Open link in same pageWater 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.
Inserted baths and spas
  1. Waterproof shelf area, incorporating waterstop under the bath lip.
  2. No requirement under bath.
  1. Waterproof to not less than 150 mm above lip of bath or spa; and
  2. No requirement under bath.
  1. Waterproof junctions within 150 mm above bath or spa; and
  2. No requirement under bath. 
N/A Waterproof tap and spout penetrations where they occur in horizontal surfaces. 
Note: Where a shower is above a bath or spa, use requirements for shower.
Other areas
 Laundries and WCs Water resistant floor of the room.  N/A  N/A  Waterproof wall / floor junctions. 
Walls adjoining other vessel (e.g. sink, basin or laundry tub) N/A Open link in same pageWater 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 Open link in same pagewaterproof or Open link in same pageWater resistant.
Note: N/A means not applicable.

 

STATE AND TERRITORY VARIATIONS

In South Australia vary Table 3.8.1.1 as follows:

SA Table 3.8.1.1 WATERPROOFING AND WATER RESISTANCE REQUIREMENTS FOR BUILDING ELEMENTS IN WET AREAS

Open link in same pageVessels or area where the fixture is installed Floors and horizontal surfaces Walls Wall junctions and joints Wall / floor junctions Penetrations
Area outside shower area
For concrete and compressed fibre-cement sheet flooring Open link in same pageWater resistant floor of the room. N/A N/A Open link in same pageWater resistant wall / floor junctions. N/A
For timber floors including particleboard, plywood and other timber based flooring materials Open link in same pageWaterproof floor of the room. Open link in same pageWaterproof wall / floor junctions
Other areas
Walls adjoining other Open link in same page vessel (e.g. sink, basin or laundry tub) N/A Open link in same pageWater resistant to a height of not less than 150 mm above the Open link in same pagevessel, for the extent of the Open link in same pagevessel, where the Open link in same pagevessel is within 75 mm of a wall. Open link in same pageWaterproof wall junctions where a Open link in same pagevessel is fixed to a wall. N/A Open link in same pageWaterproof tap and spout penetrations where they occur in surfaces Open link in same pagerequired to be Open link in same pagewaterproof or Open link in same pagewater resistant.
Laundries and WCs Open link in same pageWater resistant floor of the room. N/A N/A Open link in same pageWaterproof wall / floor junctions. Open link in same pageWaterproof penetrations where they occur in surfaces Open link in same pagerequired to be Open link in same pagewaterproof.
Bathrooms and laundries Open link in same pagerequired to be graded to a floor waste by SA 3.2.2 Open link in same pageWaterproof floor of the room. N/A N/A Open link in same pageWaterproof wall / floor junctions. Open link in same pageWaterproof penetrations where they occur through the floor.
Note: N/A means not applicable.

In South Australia delete 3.8.1.2 and insert SA 3.8.1.2 as follows:

Building elements in Open link in same pagewet areas within a building must—

(a)

be Open link in same pagewaterproof or Open link in same pagewater resistant in accordance with Open link in same pageTable 3.8.1.1, except that—

(i)

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 Open link in same pagewater resistant; and

(ii)

where a Open link in same pagevessel is inset into a bench top in a kitchen, bar area, kitchenette or domestic food and beverage preparation area—

(A)

wall junctions and joints within 150 mm above the Open link in same pagevessel must be Open link in same pagewater resistant for the extent of the Open link in same pagevessel; and

(B)

the perimeter edges of the Open link in same pagevessel must be Open link in same pagewater resistant for the extent of the Open link in same pagevessel (see Open link in same pageFigure SA 3.8.1.2); and

(iii)

penetrations in horizontal surfaces for tap and spout outlets in kitchens, bar areas, kitchenettes or domestic food and beverage preparation areas, must be Open link in same pagewaterproof; and

(b)

comply with AS 3740; and

(c)

have floor wastes provided in accordance with SA 3.2.2.

 

Figure SA 3.8.1.2

TYPICAL WATER RESISTANT JUNCTIONS AND JOINTS FOR BENCH TOPS WITH INSET VESSELS AND VESSELS ABUTTING WALLS

Show Full Sized ImageFigure SA 3.8.1.2 TYPICAL WATER RESISTANT JUNCTIONS AND JOINTS FOR BENCH TOPS WITH INSET VESSELS AND VESSELS ABUTTING WALLS
Show Full Sized ImageFigure SA 3.8.1.2 TYPICAL WATER RESISTANT JUNCTIONS AND JOINTS FOR BENCH TOPS WITH INSET VESSELS AND VESSELS ABUTTING WALLS Show Full Sized ImageFigure SA 3.8.1.2 TYPICAL WATER RESISTANT JUNCTIONS AND JOINTS FOR BENCH TOPS WITH INSET VESSELS AND VESSELS ABUTTING WALLS

3.8.1.3 External above ground membranes

Waterproofing membranes for external above ground use must comply with AS 4654 Parts 1 and 2.