J Acoustic Report · 132007.2398

                                                                                         ACOUSTICS & AIR QUALITY

8   Internal Noise Assessment

The predicted noise levels shown in Tables C.1 and D.1 are used to determine the associated
noise category for each allotment or room facade based on Schedule 3, Table 1 of MP4.4 as
follows in Table 8.1.


Table 8.1 MP4.4 Noise Categories

    MP4.4 Noise Category                Rail Noise Level              Road Traffic Noise Level
                                            Lmax dBA                     L10(18hour) dBA
              4                              ≥ 85                              ≥ 73
              3                             80 to 84                          68 to 72
              2                             75 to 79                          63 to 67
              1                             70 to 74                          58 to 62
              0                              ≤ 69                              ≤ 57


The MP4.4 classifications are included in Tables C.1 and D.1. From Table D.1, including the
noise barrier, it can be seen that the noise categories are up to Category 3, and are greater than
zero in most instances and therefore façade treatment is required to be assessed for these
rooms.
In accordance with MP4.4 the construction requirements are to be either (i) using construction
materials nominated in MP4.4, as described in Appendix E; or (ii) using construction materials
and methods that meet the minimum acoustic rating (Rw) requirements in MP4.4, as shown in
Appendix E, based on the manufacturers specifications.
To achieve the target noise reductions from external noise to internal noise levels in MP4.4 will
require the construction details are of an appropriate acoustic standard, and that all external
openings to be closed when these habitable rooms are occupied. Therefore, an air-
conditioning/mechanical ventilation system that does not degrade the internal acoustic
environment or the sound isolation of the building envelope, and also meets the ventilation
requirements of the Building Code of Australia may need to be installed.




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