Attachment 7 - Acoustic Report

9.2.3       Wall Construction
The wall construction recommendations from QDC MP4.4 are included in the table below. Note that
these are not the only allowable methods of construction for the development, and alternative
constructions to achieve the required Rw ratings may also be provided. QDC Noise Categories are
nominated in Table 14.
                                        Table 15: QDC typical wall construction
   QDC
                 Wall
  Noise                                                   Minimum Wall Treatments
                 Rw
 Category
                          Two leaves of clay brick masonry at least 110mm thick with cavity not less than 50mm
                          between leaves
                          OR
                          Single leaf of clay brick masonry at least 110mm thick with:
                          (i) a row of at least 70mm x 35mm timber studs or 64mm steel studs at 600mm centres,
                          spaced at least 20mm from the masonry wall; and
                          (ii) mineral insulation or glass wool insulation at least 50mm thick with a density of at least
                          11kg/m3 positioned between studs; and
        2         41      (iii) One layer of plasterboard at least 10mm thick fixed to outside face of studs
                          OR
                          Single leaf of brick masonry at least 110mm thick with at least 13mm thick render on each
                          face
                          OR
                          Concrete brickwork at least 110mm thick
                          OR
                          1 layer of 9mm FC externally with 90mm timber stud and 75mm glasswool batts (14kg/m3)
                          in the cavity with 13mm plasterboard internally.
                          Single leaf of clay brick masonry at least 110mm thick with:
                          (i) a row of at least 70mm x 35mm timber studs or 64mm steel studs at 600mm centres,
                          spaced at least 20mm from the masonry wall; and
                          (ii) One layer of plasterboard at least 10mm thick fixed to outside face of studs
        1         35
                          OR
                          Minimum 6mm thick fibre cement sheeting or weatherboards or plank cladding externally,
                          minimum 90mm deep timber stud or 92mm metal stud, standard plasterboard at least 13mm
                          thick internally.
        0        N/A      Standard Construction


9.2.4       Roof Construction
The roof construction recommendations from QDC MP4.4 are included in the table below. Note that
these are not the only allowable methods of construction for the development, and alternative
constructions to achieve the required Rw ratings may also be provided. QDC Noise Categories are
nominated in Table 14.
                                        Table 16: QDC typical roof construction
   QDC
  Noise         Roof Rw                                    Minimum Roof Treatments
 Category
                            Concrete or terracotta tile or metal sheet roof with sarking, plasterboard ceiling at least
     2             38       10mm thick fixed to ceiling cavity, mineral insulation or glass wool insulation at least 50mm
                            thick with a density of at least 11kg/m3.
                            Concrete or terracotta tile or metal sheet roof with sarking, plasterboard ceiling at least
     1             35
                            10mm thick fixed to ceiling cavity.
     0            n/a       Standard Construction




 2019253 R01A Lot 2 & 3 Myall Street, Cooroy RTN ENV.docx © Acoustic Works 2019                                  Page 25