HEAD START CENTER DESIGN GUIDE

10.6 Acoustics

Acoustical concerns are (1) controlling exterior noise entering the space; (2) modulating and controlling the transfer of interior noise generated within the space; and (3) controlling the transfer of noise between the center and adjacent tenants.

10.6.1 Control of Exterior Noise

Minimizing exterior noise is typically required only when the center is adjacent to or near airport flight paths, major highways, or busy rail lines. If proximity to high levels of noise is unavoidable, acoustical measures may be necessary. Maximum acceptable noise levels depend on which area of the center is subjected to the noise and whether the sound is continuous or intermittent. Suggested maximum acceptable noise levels at the center's exterior follow:

Outdoor play yards:

• Continuous: 70 dBA
• Intermittent: 80 dBA

Centers with sleeping and quiet areas placed next to outside wall:

• Continuous: 60 dBA
• Intermittent: 65 dBA

Centers with sleeping and quiet areas protected and not located along outside walls:

• Continuous: 65 dBA
• Intermittent: 70 dBA

If noise exceeds these levels, acoustical treatment may be necessary. Under these circumstances, GSA recommends the following:

• All window and door glazing should be acoustically laminated glass with an STC rating of 35 to 45, having an air space of 2 to 4 inches. (Conventional double-glazing and thermal glazing are not effective in this case.)
• Exterior doors should be high-quality commercial doors with an STC rating of 30.
• Sound-rated doors are an acceptable but more costly solution.

10.6.2 Modulating Interior Noise Generated Within the Space

In addition to standard commercial construction, other provisions are necessary to ensure sound control within a center:

• Acoustical ceiling tile should be installed throughout the center, except in service areas.
• Either non-slip throw rugs or permanently installed carpet should be used in appropriate spaces. Carpet may be particularly effective in noisy narrow corridors.
• Acoustical panels should be installed where appropriate.
• Baffles, banners, and fabrics should be considered in the design to help absorb the sound generated within a center.

10.6.3 Controlling the Transfer of Noise Within the Space

Maintaining low noise levels in sleeping/napping and quiet areas is important. The following methods can be used:

• Extend interior partitions to the structure above the ceiling Partitions may be single- layer gypsum wallboard, but should have cavity insulation and be completely caulked at the top and bottom.
• Use solid-core doors for openings onto noisy areas.
• Use fabrics and baffles to absorb sound.
• Provide acoustical baffles in all ductwork that penetrates sound-attenuating partitions.
• Avoid back-to-back electrical outlet boxes.

  10.6.4 Controlling the Transfer of Sound to Adjoining Spaces Outside Center

• Separation between centers and adjacent office space is recommended to be STC55. This may involve considerable expense, since partitions should not only be insulated but also should continue to the structure above any suspended ceiling. Additionally, joints may require complete caulking.
• No door or window openings should be placed in walls adjoining other building tenants.
• Acoustical baffles should be provided in all ductwork that penetrates sound-attenuating partitions.