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BEAM P
LUS
I
NTERIORS
C
OMMERCIAL
, R
ETAIL
A
ND
I
NSTITUTIONAL
I
NDOOR
E
NVIRONMENTAL
Q
UALITY
(IEQ)
IEQ 11 A
COUSTICS
Copyright © BEAM Society Limited. All rights reserved. Page 119
IEQ 11 A
COUSTICS
E
XCLUSION
None.
O
BJECTIVE
Encourage comfortable acoustic environment for occupants.
C
REDIT ATTAINABLE
3
C
REDIT REQUIREMENT
1 credit for demonstrating background noise levels are within the
prescribed criteria to ensure the well-being of the occupant.
1 credit for demonstrating that the reverberation time in applicable
areas meets the prescribed criteria for given types of premises to
ensure the speech clarity.
1 credit for demonstrating airborne noise isolation between rooms,
spaces and premises meets the prescribed criteria to ensure the
speech privacy.
A
SSESSMENT
Criteria
A. Internal Noise level:
i.
Classrooms - NC 35
ii.
Conference rooms - NC 35
iii.
Offices - NC 40
iv.
Retail shops and restaurants - NC 45
v.
Hotel rooms and serviced apartments - NC 35
vi.
Function, multi-function, and activity rooms - NC 45
Note: If on-site measurement is adopted, the measurement should be
based on an equivalent continuous sound level of 5 minutes [Leq
(5mins)] with the HVAC&R system operating under normal condition.
B. Reverberation time:
The average reverberation time for mid frequencies (500Hz, 1kHz and
2kHz), shall not exceed:
i.
Classrooms - 0.6s
ii.
Conference rooms - 0.6s
iii.
Offices - 0.6s
iv.
Retail shops, and restaurants - 1s
v.
Hotel rooms and service apartments - 0.4 to 0.6s
vi.
Function, multi-function and Activity rooms - 0.6s
C. Air-borne noise isolation:
i.
Between 2 classrooms - STC 37
ii.
Between 2 conference rooms and office/conference - STC 48
iii.
Between 2 offices – STC 48
iv.
Between 2 retail shops - STC 48
v.
Between 2 hotel rooms or serviced apartments - STC 52
vi.
Between 2 function or activity rooms - STC 52