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
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 10.2.33; and
where floor wastes are provided for drainage of floors in bathrooms and laundries, the floors, floor/wall junction and penetration must be waterproof.
Insert SA figure (10.2.1a) as follows:
SA Figure 10.2.1a: Typical water resistant junctions and joints for bench tops with inset vessels and vessels abutting walls
Insert SA figure (10.2.1b) as follows:
SA Figure 10.2.1b: Typical water resistant junctions and joints for bench tops with inset vessels and vessels abutting walls
Insert SA figure (10.2.1c) as follows:
SA Figure 10.2.1c: Typical water resistant junctions and joints for bench tops with inset vessels and vessels abutting walls
waterproof in WC area within a 900 mm radius from the wall connection of the handheld bidet spray device to a height of not less than 150 mm above the floor substrate; and
water resistant in WC area within a 900 mm radius from the wall connection of the handheld bidet device to not less than 1200 mm above the finished floor level of the WC.
Wall junctions within the WC area within 900 mm radius from the wall connection of the handheld bidet spray device must be waterproof.
Wall/floor junctions within the WC area within 1000 mm radius from the wall connection of the handheld bidet spray device must be waterproof.
For stepdown showers, the highest finished floor level of the shower area must be stepped down a minimum of 25 mm lower than the finished floor level outside the shower (see Figures 10.2.15a, 10.2.15b, 10.2.15c and 10.2.15d).
Figure 10.2.15a Typical enclosed stepped down shower construction (membrane below tile bed)
Figure 10.2.15b Typical enclosed stepped down shower construction (membrane above tile bed)
Figure 10.2.15c Typical unenclosed stepped down shower construction (membrane below tile bed)
Figure 10.2.15d Typical unenclosed stepped down shower construction (membrane above tile bed)
Enclosed showers with level threshold (without hob or set down)
New for 2022
For enclosed showers without a stepdown or a hob, at the extremity of the shower area, a waterstop must be positioned so that its vertical leg finishes—
where a shower screen is to be installed, not less than 5 mm above the finished floor level (see Figure 10.2.17); and
where the waterstop intersects with a wall or has a joint, the junction must be waterproof.
(2) In the case of (1)(b)(ii)(B), at doorways, where the height of the tiling angle needs to be adjusted for tiling purposes, the angle must be fixed with a sealant compatible with the waterproofing membrane without damaging the waterproofing system.
Figure 10.2.18 Typical termination of membrane at extent of shower area
Figure Notes
Fall is to be provided in accordance with 10.2.12.
be recessed into the wall to allow the water resistant surface materials and substrate materials to pass down inside the perimeter upturn lip of the shower base (see Figure 10.2.19a and Figure 10.2.19b); and
be supported to prevent distortion or cracking.
Figure 10.2.19a Typical preformed shower base wall/floor junction
Figure Notes
Rebating of timber and steel framed walls must be in accordance with AS 1684 or NASH Standard Part 2 as appropriate.
Where rebating of masonry walls is required, it must be accommodated in the design in accordance with AS 3700.
Figure 10.2.19b Typical preformed shower base/floor junction on timber floors, including particleboard, plywood and other timber materials
Where a screed is used in conjunction with a waterproof membrane, the waterproof membrane can be installed either above or below the tile bed or screed.
Perimeter flashing to wall/floor junctions must have a—
vertical leg that extends a minimum of 25 mm above the finished floor level, except across doorways; and
horizontal leg that has a minimum width of not less than 50 mm.
Where a water resistant substrate is used in conjunction with a water resistant surface material, a waterproof sealant must be installed at the substrate junction at the wall/floor junction.
Perimeter flashings at a floor level opening must comply with the following:
Where the whole wet area floor is waterproof, at floor level openings, a waterstop must be installed that has a vertical leg finishing flush with the top of the finished floor level with the floor membrane being terminated to create a waterproof seal to the waterstop and to the perimeter flashing (see Figure 10.2.24).
In any other case, at a floor level opening a waterstop must be installed that has a vertical leg finishing flush with the top of the finished floor level and waterproofed to the perimeter flashing.
A vertical flashing, either external to the wet area or internal, must extend a minimum of 1800 mm above the finished floor level.
Figure 10.2.24 Typical bathroom door details for whole bathroom waterproofing
External vertical flashing may be used with external membrane systems and installed behind the wall sheeting or render. They must have legs of sufficient width to allow the wall sheeting or render to overlap by not less than 32 mm.
Internal vertical flashing may be used with both external and internal membrane systems provided each leg has a minimum overlap of 40 mm to the wall sheeting or render and where used with—
internal membrane, must extend vertically from the shower tray; and
For hobless showers, or showers with hobs or stepdowns, the membrane must be applied over the floor and up the vertical face of the wall substrate to a minimum height of 1800 mm above the finished tile level of the floor.
Shower area membrane requirements for wall sheeting substrates
New for 2022
(1) Where wall sheeting is used with an external membrane system in a shower area it must be waterproof to prevent water movement by capillary action.
(2) Where water resistant plasterboard is used all cut edges that have the potential to be affected by water and moisture must be waterproofed, including the bottom edge over a preformed shower base.
(1) Bond breakers must be installed at all wall/wall, wall/floor, hob/wall junctions and at movement joints where the membrane is bonded to the substrate.
(2) Bond breakers must be of the type compatible with the flexibility class of the membrane to be used.
Bond breakers for Class II membranes (medium extensibility) allow the membrane to stretch. If a tape is used as a bond breaker, either the membrane must not bond to the tape or the tape must have elastic properties similar to the membrane.
Bond breakers for Class II membranes (medium extensibility) allow the membrane to stretch. If a tape is used as a bond breaker, either the membrane must not bond to the tape or the tape must have elastic properties similar to the membrane.
(1) Where a shower has a hob the membrane must be brought over the top of the hob, down the outside face and terminate not less than 50 mm onto the floor (see Figure 10.2.16).
(2) Where the shower has a waterstop, the membrane must be brought to the top of the finished floor, except where it is under a framed shower screen where it must terminate not less than 5 mm above the finished tile surface (see Figure 10.2.17 and Figure 10.2.18).
(3) Where a preformed shower base is used, provision must be made to drain the tile bed and provide a waterproof connection to the drain.
(4) Floor wastes must be of sufficient height to suit the thickness of the tile and tile bed at the outlet position.
Figure 10.2.29 Typical membrane termination at drainage outlet
Explanatory information: Drainage flanges
For membrane drainage connections in concrete floors: drainage flange may be either cast into the concrete slab or set into the top surface of the concrete slab or the tile bed.
For membrane drainage connections in other floors: drainage flange may be either set into the floor substrate or the tile bed.
Where the bottom of a door jamb does not finish above the floor tiling, the portion of the door frame below the floor tiling must be waterproofed to provide a continuous seal between the perimeter flashing and the waterstop.
(2) For a shower with a stepdown, the shower screen must be installed flush with the finished vertical surface of the stepdown of the shower area.
(3) For a shower without a hob or stepdown, the shower screen must incorporate or be mounted on an inverted channel, positioned over the top of the waterstop, that defines the shower area.
(4) For bath end walls and dividing walls abutting a shower, the shower screen must be positioned so that the bottom edge within the shower area is either flush with the outside edge of the bath or overhanging into the shower area.
Explanatory information
A self-draining sub-sill is considered to be part of the shower screen.
(1) The floor of a wet area containing a vessel must be graded to a floor waste to permit drainage of water.
(2) A floor need not be graded to the floor waste as required by (1) if—
all vessels are provided with in-built overflow protection or have a permanent open trapped connection to the plumbing and drainage system (such as a WC pan); or
the floor waste is provided solely for the connection of plumbing fixtures and all vessels in the wet area are provided with in-built overflow protection or have permanent open trapped connection to the plumbing and drainage system (such as a WC pan).
(3) A floor of a wet area that is graded without ponding to a floor waste within the shower area will satisfy (1).
(4) The fall of the floor surface graded to the floor waste in accordance with (1) or (3) must be in accordance with 10.2.12.
