NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings
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F2

Part F2 Wet areas and overflow protection

Part F2 Wet areas and overflow protection

Introduction to this Part

This Part is intended to minimise the risk of water from internal wet areas accumulating within a building and causing musty, damp or unhealthy conditions or damaging building elements by corrosion or other degradation. It is also intended to prevent water from internal parts of a building causing damage to other property or parts of a building.

Objectives

The Objective of this Part is to—

  1. safeguard occupants from illness or injury and protect buildings from damage caused by—
    1. internal water from wet areas; and
    2. the accumulation of internal moisture in the building; and
  2. protect other property from damage caused by redirected internal water from wet areas.

Functional Statements

A building including internal wet areas is to be constructed in a way that protects people, the building and other property from the adverse effects of internal water from wet areas.

A building is to be constructed to avoid the likelihood of—

  1. the creation of unhealthy or dangerous conditions; and
  2. damage to building elements,

caused by dampness or water overflow from bathrooms, laundries and the like.

Performance Requirements

NCC Blurbs

Overflow from a bathroom, laundry facility or the like must be prevented from penetrating to adjoining rooms or spaces.

NCC Title

Wet area overflows

NCC State
SA
NCC Variation Type
Replacement
NCC SPTC Current
Wet area overflows

Overflow from a bathroom, laundry facility or the like must be prevented from penetrating to—

  1. another sole-occupancy unit used for sleeping accommodation; and
  2. a public space,

in a storey below in the same building.

To protect the structure of the building and to maintain the amenity of the occupants, water must be prevented from penetrating—

  1. behind fittings and linings; and
  2. into concealed spaces,

of sanitary compartments, bathrooms, laundries and the like.

NCC Blurbs

In laundries, bathrooms or rooms containing shower facilities the floors must be installed in a manner that will prevent accumulation of surface water which could create unhealthy or hazardous conditions.

NCC Title

Prevention of surface water accumulation

NCC State
SA
NCC Variation Type
Insertion
NCC SPTC Current
Prevention of surface water accumulation

Verification Methods

Compliance with F2P1 is verified when the flow rate of the in-built overflow for all vessels in the room is greater than the flow rate of the source filling the vessel.

Applications

F2V1 only applies to bathrooms, laundries and the like in a Class 2 or 3 building or a Class 4 part of a building.

Deemed-to-Satisfy Provisions

(1) Where a Deemed-to-Satisfy Solution is proposed, Performance Requirements F2P1 and F2P2 are satisfied by complying with F2D2 to F2D4.

(2) Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A2G2(3) and A2G4(3) as applicable.

(1) In a Class 2 and 3 building and a Class 4 part of a building, building elements in wet areas must—

  1. be water resistant or waterproof in accordance with Specification 26; and
  2. comply with AS 3740.

SA F2D2 Wet area construction2019: F1.7(a) and (b)

Delete subclause F2D2(1) and insert F2D2(1) as follows:

(1) In a Class 2 and 3 building and a Class 4 part of a building, building elements in wet areas must—

  1. be water resistant or waterproof in accordance with Specification 26, except that—
    1. in any room containing a washing machine, the wall area from finished floor to a minimum of 75 mm above and 75 mm each side of the washing machine tap outlets must be water resistant; and
    2. where a vessel is inset into a bench top in a kitchen, bar area, kitchenette or domestic food and beverage preparation area, the perimeter edges of the vessel must be water resistant for the extent of the vessel; and
    3. 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
  2. comply with AS 3740.

(2) In a Class 5, 6, 7, 8 or 9 building, building elements in a bathroom or shower room, a slop hopper or sink compartment, a laundry or sanitary compartment must—

  1. be water resistant or waterproof in accordance with Specification 26; and
  2. comply with AS 3740,

as if they were in a Class 2 or 3 building or a Class 4 part of a building.

(1) Where a slab or stall type urinal is installed—

  1. the floor surface of the room containing the urinal must be an impervious material; and
    1. where no step is installed, must—
      1. be graded to the urinal channel for a distance of 1.5 m from the urinal channel; and
      2. have the remainder of the floor graded to a floor waste; and
    2. where a step is installed—
      1. the step must have an impervious surface and be graded to the urinal channel; and
      2. the floor behind the step must be graded to a floor waste; and
  2. the junction between the floor surface and the urinal channel must be impervious.

(2) Where a wall hung urinal is installed—

  1. the wall must be surfaced with impervious material extending from the floor to not less than 50 mm above the top of the urinal and not less than 225 mm on each side of the urinal; and
  2. the floor must be surfaced with an impervious material and be graded to a floor waste.

(3) In a room with timber or steel-framed walls and containing a urinal—

  1. the wall must be surfaced with an impervious material extending from the floor to not less than 100 mm above the floor surface; and
  2. the junction of the floor surface and the wall surface must be impervious.
NCC Blurbs

(1) A wet area provided with a vessel in accordance with F4D2, F4D4 and F4D5 must have the floor graded to a floor waste to permit drainage of water.

(2) With the exception of a bathroom or laundry located at any level above a sole-occupancy unit or public space in a Class 2 or 3 building or Class 4 part of a building, a floor need not be graded to a floor waste in accordance with (1) if—

  1. 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); or
  2. the vessel is a clinical hand washing basin in a Class 9c building; or
  3. the floor waste is provided solely for the connection of plumbing fixtures and all vessel 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) The fall of the floor surface to a floor waste required by (1) or (2) must be in accordance with F2D4(2).

NCC Title

Provision of floor wastes

NCC State
SA
NCC Variation Type
Replacement
NCC SPTC Current
Provision of floor wastes

(1) In a Class 2 or 3 building or Class 4 part of a building, a bathroom or laundry located at any level above a sole-occupancy unit or public space must have a floor waste.

(2) Where a floor waste is installed—

  1. the minimum continuous fall of a floor plane to the waste must be 1:80; and
  2. the maximum continuous fall of a floor plane to the waste must be 1:50.