Appendix L - Acoustic Report · MCU21/0146

                                                                                     Minimum Acoustic
                                Examples of Typical Minimum
         Glazing                                                                  Performance (all must be
                                     Glazing Thickness
                                                                                       complied with)
                                                                                   Type C minimum acoustic
                                                                                      performance Rw27
          Type C                         6mm thick float glass




In addition to comply with the above, glazing suites are to achieve the following installed minimum
transmission loss values (glazing and frame).

                                 Table 12 – Minimum Glazing Requirements


      Glazing                             Minimum installed transmission loss, dB
       Type
                       63Hz       125Hz       250Hz       500Hz        1kHz         2kHz     4kHz        8Khz
       Type A           22          27          31          34          36           37       49            52
       Type B           19          22          24          30          36           33       38            42
       Type C           19          22          24          27          33           28       34            40



All external windows and doors listed are required to be fitted with Q-lon type acoustic seals. (Mohair Seals
are unacceptable).

Where glazing is required to achieve a nominated acoustic performance the perimeter of the window frame
shall be acoustically sealed into the window opening so there is no leakage of noise between the window
frame and the building opening. The sealing method selected shall take into account and allow for any
movement of the window frame relative to the building opening and so that the acoustic performance is
maintained.

6.2    ROOF / CEILING CONSTRUCTION

The recommended roof/ceiling constructions for pitched roof is shown in Figure 2 below. Penetrations in all
ceilings (such as for light fittings etc.) must be acoustically treated and sealed gap free with a flexible sealant.
The ceiling sheet minimum requirements are presented in Table 13




                                                                   Steel sheet roof with Anticon 145
        Truss
                                                                   below




                                                                                                                 Min 250mm
                                                                    75mm thick Glass wool insulation               Air gap



                                  Figure 12 - Roof/ceiling constructions


 I:\Jobs\2021\20210208\20210208.3\20210816JJMA_R3_Development_Application_.docx
                                                                                            Ceiling sheet          27