20150300 - Drawings · OPW15/0169

CONSTRUCTION REQUIREMENTS SEPARATING WALLS (CLASS 1 & 10 BUILDING ONLY)
The following is a guide for the construction of Separating Walls for Class 1 and 10 buildings which, due to their location relative to other dwelling units    Table 1 REQUIRED Rw AIRBORNE AND IMPACT SOUND LEVELS FOR SEPARATING WALLS
are required by the BCA/NCC to provide insulation from airborne and impact sound to protect amenity between residences.                                         SEPARATING WALL — LOCATION AND                                         DISCONTINUOUS                                        R w + C tr
                                                                                                                                                                PENETRATIONS                                                       CONSTRUCTION REQUIRED                               (As per Table 3.8.6.2)
                       THIS ADVICE IS TAKEN FROM PART 3.8 OF THE ACCEPTABLE CONSTRUCTION MANUAL OF BCA
                                   IF IN DOUBT PLEASE CONTACT PACIFIC BCQ PRIOR TO PROCEEDING.
                                                                                                                                                                Between a bathroom, sanitary compartment, laundry or                              YES                                              50
                                                                                                                                                                kitchen and a habitable room (other than a kitchen) in an
Separating walls                                                                                                                                                adjoining Class 1 building (dwelling) (see Figure 1).
 (a) To provide insulation from airborne and impact sound, a separating wall between two or more Class 1 buildings must:                                        In all other cases to those listed above.                                          NO                                              50
     (i) achieve the weighted sound reduction index with spectrum adaptation term (Rw + Ctr) and discontinuous construction requirements, as
          required by Table 1; and                                                                                                                              DUCT, SOIL, WASTE, AND WATER SUPPLY PIPES
     (ii) be installed in accordance with the appropriate requirements of detailed below.                                                                       AND STORM WATER PIPES                                                              NO                                              40
                                                                                                                                                                A duct, soil, waste, or water supply pipe or storm water pipe
 (b) For the propriety dividing walls such as CSR and Boral plasterboard systems, the Rw + Ctr must be determined in accordance with                            that passes through a separating wall between Class 1
     AS/NZS 1276.1 or ISO 717.1, using results from laboratory measurements, test certificates will be required                                                 buildings:
                                                                                                                                                                (a) if the adjacent room is a habitable room (exc kitchen); or
General installation requirements for walls
                                                                                                                                                                (b)if the room is a kitchen or any other room.                                     NO                                              25
(a) To achieve the appropriate level of sound insulation, walls must:                                                                                           Notes:
         Have the junction of sound insulated walls with any perimeter walls and roof cladding, be sealed in accordance with Figure.2.                          (a) Discontinuous construction means a wall system having a minimum 20 mm cavity between two separate leaves, with:
                                                                                                                                                                     (i) for masonry, where wall ties are required to connect leaves, the ties are of the resilient type; and
              Masonry units must be laid with all joints filled solid, except for adequately sound insulated articulation joints, including those between           (ii) for other than masonry, there is no mechanical linkage between leaves except at the periphery.
               the masonry and any adjoining construction.                                                                                                      (b) A staggered stud wall is not deemed to be discontinuous construction.


              Concrete panels must have joints between panels and any adjoining construction filled solid.
                                                                                                                                                                                Figure 1
              Plasterboard must be installed as follows:                                                                                                                       REQUIRED AIRBORNE AND IMPACT SOUND INSULATION — PLAN VIEW
               (i) If one layer is required on both sides of a wall the joints must be staggered on opposite sides (See Figure 3).
               (ii) If two layers are required, the first layer must be fastened in accordance with (i)and the second layer joints must not coincide with
                     those of the first layer (See Figure 3).
               (iii) The outer layer joints between sheets and the joints between sheets and any adjoining construction must be taped and filled solid.

               Where steel wall framing is used, the steel framing and perimeter members must be installed as follows:
                (i) The section of steel must be not less than 0.6 mm thick.
                (ii) Studs must be not less than 63 mm in depth unless another depth is specified in Table A.
                (iii) Studs must be fixed to steel top and bottom plates of sufficient depth to permit secure fixing of the plasterboard.
                (iv) 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.

               Where wall framing is used the timber studs and perimeter members must be installed as follows:
                (i) Studs must be fixed to top and bottom plates of sufficient depth to permit secure fixing of the plasterboard.
                (ii) Noggings and like members must not bridge between studs supporting different wall leaves.
                (iii) All timber 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 there are no voids between the timber members and the wall.

Services

(a)    Services must not be chased into concrete or masonry separating walls.
(b)    If a duct, soil, waste, water supply or storm water pipe serves or passes through a separating wall or is located in a separating wall:
            (i) a door or panel providing access to a duct or pipe required to be separated must:
                  (A) not open into any habitable room, other than a kitchen; and
                  (B) 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 and be constructed of:
                         (aa) wood, plasterboard or blockboard not less than 33 mm thick; or
                         (bb) compressed fibre reinforced cement sheeting not less than 9 mm thick; or
                         (cc) other suitable material with a mass per unit area not less than 24.4 kg/m2; and
            (ii) in the case of a water supply pipe, it must:
                  (A) only be installed in discontinuous construction; and
                  (B) in the case of a water supply pipe that serves one dwelling, not be fixed to the wall leaf on the side of any other dwelling and have a
                         clearance not less than 10 mm to the other wall leaf.
(c) Electrical outlets must be offset from each other:
            (i) in masonry walling, not less than 100 mm; and
            (ii) in timber or steel framed walling, not less than 300 mm.



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