NCC 2019 Volume Three
Part D1 Excessive noise

Part D1 Excessive noise

Introduction to this Part

This Part sets out the requirements to prevent excessive noise being generated from a plumbing and drainage system that could cause illness or loss of amenity to occupants in a building.

Explanatory information:

Explanatory information:

Explanatory information:

OBJECTIVE

DO1

The Objective of this Part is to—

  1. safeguard people from illness, injury or loss (including loss of amenity) due to excessive noise of a plumbing and drainage system; and
  2. ensure that a plumbing and drainage system installation throughout its serviceable life will continue to satisfy the requirements of Objective (a).

FUNCTIONAL STATEMENTS

DF1

Plumbing and drainage systems must be designed and installed so as to operate in a way that avoids the likelihood of excessive noise of any part of the plumbing and drainage system, and minimises any adverse impact on building occupants.

Performance Requirements

DP1.1 Undue noise

(1)

Plumbing and drainage systems must be designed, constructed and installed in a manner that does not create undue noise.

DP1.2 Excessive noise

(1)

Plumbing and drainage systems must be designed to reduce the transmission of airborne and/or impact generated sound which may cause illness or loss of amenity to occupants.

Application 1:

Application 1:

DP1.2 only applies to a plumbing or drainage system that is located in—

  1. a separating wall of a Class 1 building; or
  2. a Class 2, 3 or 9c building that is required to be sound rated.
(2)

The required sound insulation of a floor or wall must not be compromised by the incorporation or penetration of a plumbing or drainage system.

NT Note 1

Note 1:

Note 1:

Part F5 in Volume One of the NCC contains Performance Requirement FP5.1 through to FP5.6 which cover sound transmission and insulation in walls and floors of Class 2, 3 and 9c buildings.

NT Note 2

Note 2:

Note 2:

Part 2.4 in Volume Two of the NCC containsPerformance Requirement P2.4.6 which covers sound insulation of walls in Class 1 buildings.

Verification Methods

There are no Verification Methods in this Part.

Deemed-to-Satisfy Provisions

D1.1 Application

(1)

Performance RequirementDP1.1 is satisfied by complying with D1.2.

NT D1.1(2)

(2)

Performance RequirementDP1.2 is satisfied by complying with D1.3

D1.2 Undue noise

(1)

To prevent undue noise plumbing and drainage systems must comply with—

(a)

B1.4 for cold water services; or

(b)

B2.9 for heated water services; or

(c)

B3.3 for non-drinking water services; or

(d)

B4.2 for fire-fighting water services; or

(e)

C1.3 for sanitary plumbing systems; or

(f)

C2.4 for sanitary drainage systems.

D1.3 Sound insulation

(1)

If a plumbing or drainage system serves or passes through more than one sole-occupancy unit in a Class 2, 3 or 9c building, it must be separated from the rooms of any other Sole-occupancy unit by construction with an Rw + Ctr (airborne) not less than—

(a)

40 if the adjacent room is a habitable room (other than a kitchen); or

(b)

25 if the adjacent room is a kitchen or a non-habitable room.

Note 1:

Note 1:

Specification F5.2 in Volume One of the NCC lists sound ratings for some common forms of construction. If any of these common forms of construction are used, the plumbing or drainage system must be installed in accordance with the requirements of that Specification.

(2)

In Class 2, 3 or 9c buildings, a flexible coupling must be used to connect a pump to a plumbing or drainage system.

(3)

If a plumbing or drainage system is located in (or passes through) a separating wall in a Class 1 building, it must—

(a)

only be installed in discontinuous construction; and

(b)

not be fixed to the wall of a dwelling that it does not serve; and

(c)

have a gap not less than 10 mm between the pipe and a wall of a dwelling that it does not serve; and

(d)

not be chased in if the separating wall is made of concrete or masonry.