Table 3-5
1
2
3
4
5
Space
Maximum
Minimum
Minimum
Minimum
Mechanical
Absorption:
Absorption:
Noise
Optimum
Noise
Ceiling
Walls
Isolation
Reverberation
(SAA/NRC)1
(NIC)
(RT60)
(RC/NC)
(SAA/NRC)
Teleconference Facility
20
0.8/
0.8/
53
0.5
50%
25%
482
Meeting rooms,
25
0.8/
0.8/
0.6
training facilities
50%
25%
Private offices,
30
n/a
0.8/
45
n/a
confidential speech privacy
25%
Private offices,
35
n/a
0.8/
40
n/a
normal speech privacy
25%
353
Private offices, normal speech
n/a
0.8/
35
n/a
privacy, sound masking
25%
Private offices, normal speech
35
n/a
0.8/
31
n/a
privacy, low voice level
25%
404
Open Plan offices, normal speech
0.9/
0.8/
n/a
n/a
privacy, sound masking
100%
25%
Open Plan offices,
40
0.8/
n/a
n/a
n/a
no speech privacy
100%
Child care center
35
0.8/
0.8/
31
0.5
80%
25%
1 Absorption should be placed on two adjacent walls.
2 Operable walls and partitions shall achieve the required NIC rating for the spaces that they are separating.
3 Steady state background noise provided by electronic sound masking system: 40-42 dBA.
4 Steady state background noise provided by electronic sound masking system: 45-8 dBA.
78 F A C I L I T I E S S T A N D A R D S
FOR THE
PUBLIC
BUILDINGS
SERVICE
3.4 Special Design Considerations
Revised March 2005 PBS-P100
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