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Goal: To create an environment suitable
for use as a cafeteria and an auditorium, while accounting for the
acoustic needs of both.
- Related Codes & Standards
- Tips/Considerations
- Because of the size and the materials typically used in this type of space, a cafeteria can become very reverberant, causing a tremendous build up of noise. Absorptive materials are needed to help control this reverberation. Typically, you wouldn't carpet a cafeteria; even if you did, carpet is only about 20-35% absorptive. Ceiling and/or wall treatments are necessary.
- If occupants can come in contact with the wall treatment, use materials that are cleanable and durable. This is less of a concern if the wall treatment is out of reach.
- It is vital to control the reflections from the back wall. If you don't control them, the presentation could reflect off the back wall and "slap back" to the presenter(s). This won't necessarily impact the audience, but could be disastrous and distracting for the people on stage. Because of this, it's usually necessary to treat the back wall with an absorptive material.
- HVAC noise, which is often overlooked, can negatively impact the usability of a space. To help protect your design, the NC level should not exceed 30 to 35. When specifying NC, specify an actual rating, such as NC 30, rather than a range, such as NC 30-35. Although specifying a lower number will ensure minimal background noise, it might be cost prohibitive to achieve. Be realistic about the amount of acceptable noise and the project's budget when specifying an NC level.
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