Noise Report [As Published] · 132007.2398

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ASL Care ==

Proposed RSL Retirement Village, Cooroy — Road and Rail Noise Assessment

 

facades requiring Construction Category 3, the required mitigation should be determined
upon further analysis by a qualified noise consultant, in accordance with clause 3.4 of
AS 3671.

Given the required construction category, AS 3671 provides typical STC information for
standard construction types. STC (Sound Transmission Class) is a commonly referenced
descriptor of the effectiveness of a material to reduce the noise energy transmitted through
that material. The TNR must be adjusted to give the STC, and is estimated as equivalent to
TNR + 6 dB(A) to account for the spectral composition of the noise source (as per Table 4.5).

Table 4.6 presents typical STC data for standard construction types that may be suitable for
achieving the required noise reductions identified above (except for the first floor of
Apartment 2). For construction materials associated with the first floor of Apartment 2, refer
to Table 5.4 in Section 5.3.2 of the Rail Noise Assessment.

TABLE 4.6: TYPICAL STC RANGES FOR STANDARD CONSTRUCTION TYPES

 

sTc

Component Range

Examples of Construction

 

Pitched roof with 0.6 mm corrugated galvanised iron or
Ceiling / Roof 36 - 38 6mm corrugated cellulose-cement over two layers of
gypsum plasterboard (AS 3671)

 

Conventional timber stud-framed walls, clad externally with |

9 mm thick flat cellulose-cement sheets, and internally
External Walls | 36-38 | with 10 mm thick plasterboard, cavity filled with mineral
wool (AS 3671)

 

. . 10 mm single glazing or double glazing (7mm laminated
Windows 33-35 and 6 mm at 6 mm) (AS 3671)

 

 

 

 

 

Before any construction material is chosen for the affected receptors, STC information should
be sought from the suppliers to ensure that the minimum STC’s as detailed in Table 4.5 are
achievable. In order to achieve design STC ratings it is essential that the acoustically treated
areas be constructed in a manner conducive to maximising sound attenuation. For example
there must be no air gaps around windows or at the eaves, which could act as noise
pathways.

As a minimum it is recommended that all building elements (including the roof) are selected to
achieve the minimum STC as defined in Table 4.6.

4.6.5 Open Space

In order to minimise noise levels at open spaces for ILUs it would be necessary to provide
useable areas in the shadow zone of each of the ILU buildings. Additional shielding in the
form of architectural acoustic barriers may also be required to increase the compliant area for
some of the ILU buildings.

 

AIR NOISE ENVIRONMENT PTY LTD
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