NCC 2016 Volume One
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Section F Health And Amenity
Floors separating sole-occupancy units must provide insulation against the transmission of airborne and impact generated sound sufficient to prevent illness or loss of amenity to the occupants.
NT FP5.1 only applies to a Class 2 or 3 building or a Class 9c building.
Walls separating—
a sole-occupancy unit from a plant room, lift shaft, stairway, public corridor, public lobby or the like,
must provide insulation against the transmission of airborne and impact generated sound sufficient to prevent illness or loss of amenity to the occupants.
NT FP5.2 only applies to a Class 2 or 3 building.
Walls separating—
a sole-occupancy unit from a kitchen, bathroom, sanitary compartment (not being an associated ensuite), laundry, plant room or utilities room,
must provide insulation against the transmission of airborne sound sufficient to prevent illness or loss of amenity to the occupants; and
a sole-occupancy unit from a kitchen or laundry,
must provide insulation against the transmission of impact generated sound sufficient to prevent illness or loss of amenity to the occupants.
NT FP5.4 only applies to a Class 9c building.
Where a Deemed-to-Satisfy Solution is proposed, Performance RequirementsNT FP5.1 to NT FP5.4 are satisfied by complying with NT F5.1 to NT F5.8.
Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A0.7.
The Deemed-to-Satisfy Provisions of this Part apply to Class 2 and 3 buildings and Class 9c aged care buildings.
A form of construction required to have a certain weighted sound reduction index (Rw) must—
have the required value determined under AS/NZS 1276.1, or ISO 717.1; or
comply with NT Specification F5.2.
A floor separating sole-occupancy units must have an Rw not less than 45.
A wall must have an Rw not less than 45 if it separates—
a sole-occupancy unit not within a Class 9c building from a plant room, lift shaft, stairway, public corridor, hallway or the like.
a sole-occupancy unit in a Class 9c building from a kitchen, bathroom, sanitary compartment (not being an associated ensuite), laundry, plant room or utilities room.
Except for a Class 9c building, a wall separating a bathroom, sanitary compartment, laundry or kitchen in one sole-occupancy unit from a habitable room (other than a kitchen) in an adjoining unit must—
have an Rw of not less than 50; and
provide a satisfactory level of insulation against impact sound; and
not incorporate a duct which reduces the Rw of the wall to less than 50.
A wall satisfies (a)(i) and (a)(ii) if it is—
in accordance with NT Table F5.5; or
for other than masonry, in 2 or more separate leaves without rigid mechanical connection except at their periphery; or
identical with a prototype that is no less resistant to the transmission of impact sound when tested in accordance with NT Specification F5.5 than a wall listed in NT Table F5.5.
NT Table F5.5 CONSTRUCTION OF WALLS TO REDUCE IMPACT SOUND
Cavity brickwork— Two leaves of 90 mm brick masonry with—
|
Single leaf brickwork— 110 mm thick brick masonry with—
|
Concrete blockwork— 190 mm thick concrete block masonry with—
|
If a soil or waste pipe, including a pipe that is embedded in or passes through a floor, serves or passes through more than one sole-occupancy unit—
the pipe must be separated from the rooms of any sole-occupancy unit by construction with an Rw not less than—
45 if the adjacent room is a habitable room (other than a kitchen); or
30 if the adjacent room is a kitchen or any other room; and
a door or panel providing access to the pipe must not open into any habitable room (other than a kitchen); and
an access door or panel in any other part must be firmly fixed so as to overlap the frame or rebate of the frame by not less than 10 mm, be fitted with a sealing gasket along all edges and constructed of—
wood, particleboard or blockboard not less than 38 mm thick; or
compressed fibre reinforced cement sheeting not less than 9 mm thick; or
other suitable material with a mass per unit area not less than 24.4 kg/m2.
A flexible coupling must be used at the point of connection between the service pipes in a building and any circulating or other pump.
In addition to NT F5.4, a wall separating a sole-occupancy unit in a Class 9c building from a kitchen or laundry must—
for other than masonry, be two or more separate leaves without rigid mechanical connection except at their periphery; or
be identical with a prototype that is no less resistant to the transmission of impact sound when tested in accordance with NT Specification F5.5 than a wall listed in Table 2 of NT Specification F5.2.
The forms of construction listed in Table 2 are considered to have the Rw stated in that Table if installed as follows:
Masonry—Units must be laid with all joints filled solid, including those between the masonry and any adjoining construction.
Concrete slabs—Joints between concrete slabs and any adjoining construction must be filled solid.
Plasterboard—
if one layer is required under this Specification, it must be screw-fixed to the studs with joints staggered on opposite faces; and
if 2 layers are required, the first layer must be fixed according to (i) and the second layer must be fixed to the first layer with nails, screws or adhesive so that the joints do not coincide with those of the first layer; and
joints between sheets or between sheets and any adjoining construction must be taped and filled solid; and
fire-protective grade plasterboard must be the special grade manufactured for use in fire-resisting construction.
Steel studs and perimeter members—
the section of steel must be not less than 0.6 mm thick; and
studs must be not less than 63 mm in depth unless another depth is listed in Table 2; and
studs must be fixed to steel top and bottom plates of sufficient depth to permit secure fixing of the plasterboard; and
all steel members at the perimeter of the wall must be securely fixed to the adjoining structure and bedded in resilient compound or the joints must be caulked so that there are no voids between the steel members and the wall.
Table 2 R w APPLICABLE TO CONSTRUCTION
Construction | R w (not less than) |
---|---|
WALLS Clay brickwork—
Concrete brickwork — 110 mm thick with a mass per unit area of not less than 195 kg/m2 Concrete blockwork—
Concrete—
Steel stud walling—
|
45 45 45 45 45
45 |
FLOORS— Concrete—
Timber — comprising—
|
45 45 |
DUCTS OR OTHER CONSTRUCTION SEPARATING SOIL AND WASTE PIPES FROM UNITS Masonry — not less than 90 mm thick Plasterboard — 2 layers of plasterboard—
|
30 30 |
This Specification describes a method of test to determine the comparative resistance of walls to the transmission of impact sound.
The test is conducted on a specimen of prototype wall construction and on a specimen of one or other of the constructions specified in NT Table F5.5.
The testing of a construction specified in NT Table F5.5 need not be repeated for subsequent comparisons provided complete records of the results, the test equipment and the technique of testing are kept so that identical equipment can be employed and an identical technique can be adopted in the testing of specimens of prototype wall construction.
The wall constructions to be compared must be tested in accordance with AS 1191.
A horizontal steel platform 510 mm x 460 mm x 10 mm thick must be placed with one long edge in continuous and direct contact with the wall to be tested on the side of the wall on which the impact sound is to be generated.
A tapping machine complying with ISO 140/6—1998 (E) must be mounted centrally on the steel platform.
The sound transmission through the wall must be determined in accordance with AS 1191 except that the tapping machine as mounted on the steel platform must be used as the source of sound.
The impact sound pressure levels measured in the receiving room must be converted into normalised levels using a reference equivalent absorption area of 10 m2.