Auditorium spaces are designed to accommodate large audiences. As such, they tend to have wide spans and are multiple-stories high in order to accommodate seating, sightline, and acoustical requirements. Raised stage/dais floors and special lighting equipment are often required as well. Typical features of Auditorium space types include the list of applicable design objectives elements as outlined below. For a complete list and definitions of the design objectives within the context of whole building design, click on the titles below.
- Occupancy:Occupancy Group Classification is Assembly A1 or A3 as per IBC, with sprinkler protected construction, and GSA Acoustical Class A space requiring special acoustical design. See also WBDG Secure / Safe—Fire Protection.
- Special Acoustical Design:Quality acoustical characteristics are important in Auditorium spaces so that performances and presentations can be clearly heard and understood. For performance spaces and general presentation spaces, recommended noise criteria (NC) rating ranges from NC-20 to NC-30; recommended sound transmission class (STC) rating ranges from STC 40 to STC 50. Strategies to achieve the recommended NC and STC ranges include, for example: Type II vinyl wall covering and fabric covered acoustical wall panels for the interior wall finish in the auditorium; Type II vinyl wall covering for the stage area; Type II vinyl wall coverings for 1/3 of the front of the orchestra (audience) sidewalls and fabric covered acoustical panels for 2/3 of the back of the orchestra (audience) sidewalls; fabric covered acoustical panels for rear walls; and a plaster and plywood combination—because of their reverberation characteristics—for the ceiling. For more information, see WBDG Productive—Provide Comfortable Environments.
- Raised Floor:The recommended system for distribution of HVAC in auditorium spaces is ducted supply through floor vents with ducted ceiling return air vents in auditorium and lobby. In other spaces, ducted ceiling supply with return air ceiling plenum is recommended. Note that there should be transfer ducts at all acoustically rated partitions.
- Fire and Life Safety:Proper notification systems, lighting, and signage are required to facilitate safe and speedy evacuations during an emergency in the Auditorium spaces. Step lights recessed into floor risers at each seating tier and wall mounted low light level sconce lights along side walls are typical. Sprinklers should be provided per code and under stage platforms to suppress fires. See also WBDG Secure / Safe—Occupant Safety and Health and Secure / Safe—Plan for Fire Protection.
The following building program is representative of Auditorium space types.
Tenant Occupiable Areas
|Qty.||SF Each||Space Req'd.||Sum Actual SF||Tenant Usable Factor||Tenant USF|
|Seating (300 seats)||1||3,600||3,600|
|Rear Projection Room||1||400||400|
|Public Toilets (Male||1||120||120|
|Public Toilets (Female)||1||180||180|
|Tenant Usable Areas||18,750|
The following diagram is representative of typical tenant plans.
Example Construction Criteria
Relevant Codes and Standards
The following agencies and organizations have developed codes and standards affecting the design of Auditoriums. Note that the codes and standards are minimum requirements. Architects, engineers, and consultants should consider exceeding the applicable requirements whenever possible.
Organizations and Associations
- Acoustical Society of America (ASA)—The Society is primarily a voluntary organization and attracts the interest, commitment, and service of a large number of professionals. Their contributions in the formation, guidance, administration, and development of the ASA are largely responsible for its world-wide preeminence in the field of acoustics.
- Institute of Noise Control Engineering—The Institute of Noise Control Engineering of the USA (INCE/USA) is a non-profit professional organization incorporated in Washington, DC. A primary purpose of the Institute is to promote engineering solutions to environmental noise problems.