UFC 4-740-14
1 August 2002
7-1.8.1
Interior. Limit the reverberation time to 0.6-0.8 seconds, generally.
Design for less than 0.6 seconds in smaller spaces. The administrative space's and
activity room's anticipated peak noise level is 70-80 dBA. The preferred sound criteria
is 35-40 dBA, maintained for at least 80 percent of the time. Limit the ambient noise
level from mechanical systems, outside noises, and adjacent spaces to 30-40 dBA.
Design walls separating children's activity rooms to have a STC rating of 50 or better.
Do not allow mechanical peak noise level to exceed 85 dBA.
7-1.8.2
Exterior. Maximum acceptable noise levels at the center's exterior are as
follows:
7-1.8.2.1
Outdoor Play Yards:
Continuous: 70 dBA
Intermittent: 80 dBA
7-1.8.2.2
General exterior at centers with sleeping and quiet areas placed next to
outside wall
Continuous: 60 dBA
Intermittent: 65 dBA
7-1.8.2.3
General exterior at centers with sleeping and quiet areas protected and
not located along outside walls.
Continuous: 65 dBA
Intermittent:70 dBA
7-1.8.2.4
If greater than maximum allowable environmental noise levels exist, then
acoustical treatment is required. Under these circumstances, the following is
recommended:
Use acoustically laminate glass with a Sound Transmission Coefficient
(STC) rating of 35 to 45, having an air space of 50 mm to 100 mm (2 in. to
4 in.) for all window and door glazing. (Conventional double-glazing and
thermal glazing is not effective in this case.)
Use high-quality commercial doors with a minimum STC rating of 30 for
exterior doors.
Air Force requires that if any exterior sound generation exceeds
these figures, the design must include a multipurpose room or an internal
covered atrium with playground surfacing.
7-2
SERVICES.
7-9
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