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IEQ-12 INTERNAL NOISE LEVELS

 

Erratum

Green Star SA – Office v1 Technical Manual: Page 104

Erratum Number
IEQ12-E-OB1-0559

Guidance
2012-08-17

Documentation Requirements, description of documents, As Built, Short Report, replace the second bullet point with “Describe the test methodology used, the conditions under which the testing was done, including the time of testing and confirming that the spaces tested are representative and ‘worst case’”.

 

Technical Clarification

Intermittent / Emergency generator noise (This TC replaces IEQ12-T-OB1-0218)

Technical Clarification Number
IEQ12-T-OB1-547

Guidance
2012-07-20

After significant review, the GBCSA have concluded that emergency generators (<100hr annual operation) will not currently form part of the scope of the IEQ-12 credit for Green Star SA – Office v1 certification. As such, project teams may exclude emergency generator equipment from compliance within the IEQ-12 credit.

Please note the following summary of findings:

• From the review conducted, it is clear that emergency generators can in fact affect occupant IEQ significantly, and for this reason it is best practice internationally to address noise from emergency generators in this regard.
• However, it has been found that in order to address the noise generated from emergency generators in terms of the IEQ-12 credit in the Green Star SA – Office v1 tool, significant differences in how noise levels are measured in the credit as well as varying benchmarks for acceptable noise levels may need to be introduced, which is seen as a change to the current scope of the IEQ-12 credit. The GBCSA believe that this level of change in the credit is not appropriate within a single version of the tool, and as such, should take place in future revisions of the Green Star SA – Office tool or within the development of new rating tools.

Thus in summary, the GBCSA believe noise emissions from emergency generators to be a significant IEQ as well as noise pollution concern and would encourage project teams to take this into account within their design. There are however technical aspects to addressing this issue which the current structure of the IEQ-12 credit in the Green Star SA – Office v1 tool is not able to accommodate, and as such for Green Star SA certification under the Office v1 rating tool, noise from emergency generators need not be included in the scope of the IEQ-12 credit and projects will not be assessed on this issue. Noise from emergency generators will be included for implementation review in future versions of the Green Star SA – Office rating tool as well as development of future Green Star SA rating tools.

 

Credit Interpretation Request

External noise level survey

Credit Interpretation Request Number
IEQ12-C-OB1-0319

Ruling
2012-01-10

The CIR Review Panel notes that due to circumstances pertaining to site activities or neighbouring site activities, it may not be possible to conduct a survey of external noise levels throughout “normal working hours, during a normal working day” without interference of intermittent noise sources which are not an on-going characteristic of the site (e.g. construction noise emanating from the site or neighbouring sites). Where motivated and justified by the qualified Acoustic Consultant, conducting an external noise level survey on the site at a time outside of “normal working hours, during a normal working day” and applying noise level correction(s) to account for noise sources likely, but not present at the time of survey, is an acceptable methodology to satisfy the survey of external noise levels requirement. The intent of the survey of external noise levels is to appropriately inform the acoustic design response and recommendations of the qualified Acoustic Consultant. As such, it is the responsibility of the qualified Acoustic Consultant to accurately account for any noise level corrections applied in this scenario

 

Technical Clarification

Internal noise levels and 'Shell & Core' spaces

Technical Clarification Number
IEQ12-T-OB1-0364

Guidance
2012-01-06

The following guidance is provided for spaces delivered as ‘Shell & Core’, as defined in the Green Star SA Office v1 Technical Manual.

The internal noise level within a mechanically ventilated space is highly influenced by the design of the HVAC system within the space. Where a mechanically ventilated space is not provided with a complete HVAC system, as evidenced through the provision of a fully documented design within the tender documentation (Design rating) or as installed As Built documentation and commissioning reports (As Built rating), compliance with the Credit Criteria cannot be demonstrated.

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 104

Erratum Number
IEQ12-E-OB1-0130

Guidance
2011-01-06

Documentation Requirements, documentation table, Design section, change "If Overall Building point if claimed:" to "If Overall Building point is claimed:".

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 104

Erratum Number
IEQ12-E-OB1-0136

Guidance
2011-01-06

Documentation Requirements, description of documents, under the heading "Survey of external noise levels" change "24 hours" to "normal working hours."

 

Technical Clarification

Representative floors

Technical Clarification Number
IEQ12-T-OB1-0070

Guidance
2010-05-17

For the internal noise level measurements for an As Built submission, it is permissible to test a representative floor of a multi-story building with repetitive, identical floor plates, as long as the worst case of the repetitive floors is tested and the project submission clearly demonstrates and justifies that the floor tested is worst case. Any floor with a different floor plan must be tested separately.

 

Credit Interpretation Request

False ceilings

Credit Interpretation Request Number
IEQ12-C-OB1-0064

Ruling
2010-05-13

The CIR requesting to subtract 3dB from the measured noise values in cases where there is an intention for tenants to install a false ceiling that is not currently in place is denied. Green Star SA – Office v1 certifies the base building that the developer has control over, and it can not be assumed that a tenant will install an additional ceiling.

 

Credit Interpretation Request

Measurement methodology

Credit Interpretation Request Number
IEQ12-C-OB1-0063

Ruling
2010-05-12

The CIR requesting to replace the sampling frequency for internal noise levels with an alternative methodology is granted. The approved methodology is as follows. All area values are Usable Area.

- A minimum of one measurement is required in every enclosed room.
- For rooms up to 300m2 in size, one measurement is required for every 100m2.
- For rooms larger than 300m2, at least 3 measurements must be taken in each zone. Zones must be laid out by the acoustician and meet the following criteria. Maximum size of a zone is 600m2, and a zone is a continuous volume that is not broken up by ceiling height partitions or change of floor plate direction of more than 45 degrees. Areas on either side of a 90 degree bend would have to be separate zones.

The acoustician must determine the measurement points to be representative of the noise climate in the particular area.

 

Credit Interpretation Request

Internal noise level measurement reference standard

Credit Interpretation Request Number
IEQ12-C-OB1-0066

Ruling
2010-05-11

The CIR requesting to use SANS 10103:2004 as the internal noise level measurement standard in lieu of British Standard BS EN ISO 140-4:1998 is granted.

 

Credit Interpretation Request

External noise measurements

Credit Interpretation Request Number
IEQ12-C-OB1-0035

Ruling
2009-05-21

The Credit Interpretation Request (CIR) seeking approval for measuring external noise on a neighbouring site, rather than the actual project site, is denied. There is no assurance that noise levels on a neighbouring site accurately reflect those on the actual project site.

 

 

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