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807.1 Sound Transmission and Sound Levels
Where required by Table 302.1, buildings and tenant spaces shall comply with the minimum sound transmission class and maximum sound level requirements of Sections 807.2 through 807.5.2.
Exception: The following buildings and spaces need not comply with this section:
  1. Building or structures that have the interior environment open to the exterior environment.
  2. Parking structures.
  3. Concession stands and toilet facilities in Group A-4 and A-5 occupancies.
807.2 Sound Transmission
Sound transmission classes established by laboratory measurements shall be determined in accordance with ASTM E 413 based on measurements in accordance with ASTM E 90. Sound transmission classes for concrete masonry and clay masonry assemblies shall be calculated in accordance with TMS 0302 or determined in accordance with ASTM E 413 based on measurements in accordance with ASTM E 90. Field measurements of completed construction, if conducted, shall be in accordance with ASTM E 336 where conditions regarding room size and absorption required in ASTM E 336 are met.
807.2.1 Interior Sound Transmission
Wall and floor-ceiling assemblies that separate Group A and F occupancies from one another or from Group B, I, M or R occupancies shall have a sound transmission class (STC) of not less than 60 or an apparent sound transmission class (ASTC) of not less than 55 if the completed construction is field tested. Wall and floor-ceiling assemblies that separate Group B, I, M or R occupancies from one another shall have a sound transmission class (STC) of not less than 50 or an apparent sound transmission class (ASTC) of not less than 45 if the completed construction is field tested. Wall and floor-ceiling assemblies that separate Group R condominium occupancies from one another or from other Group B, I, M or R occupancies shall have a sound transmission class (STC) of not less than 55 or an apparent sound transmission class (ASTC) of not less than 50 if the completed construction is field tested.
Exception: This section shall not apply to wall and floor-ceiling assemblies enclosing:
  1. Public entrances to tenants of covered and open mall buildings.
  2. Concession stands and lavatories in Group A-4 and A-5 occupancies.
  3. Spaces and occupancies that are accessory to the main occupancy.
807.2.2 Mechanical and Emergency Generator Equipment and Systems
Wall and floor-ceiling assemblies that separate a mechanical equipment room or space from the remainder of the building shall have a sound transmission class (STC) of not less than 50 or an apparent sound transmission class (ASTC) of not less than 45 if the completed construction is field tested, Wall and floor-ceiling assemblies that separate a generator equipment room or space from the remainder of the building shall have a sound transmission class (STC) of not less than 60 or an apparent sound transmission class (ASTC) of not less than 55 if the completed construction is field tested.
807.3 Sound Levels
The design and construction of mechanical and electrical generator systems and of walls and floor-ceilings separating such equipment from the outdoors or other building space shall achieve sound levels not greater than specified in Sections 807.3.1 and 807.3.2 during the normal operation of mechanical equipment and generators. Electrical generators used only for emergencies are exempt from the limits on sound levels within the building and need only meet daytime limits for sound-reaching boundaries. Where necessary, walls and floor-ceiling assemblies with sound transmission class (STC) ratings greater than specified in Section 807.2.2 shall be used to meet this requirement.
807.3.1 Sound of Mechanical and Electrical Generator Equipment Outside of Buildings
Where mechanical equipment or electrical generators are located outside of the building envelope or their sound is exposed to the exterior environment, the sound reaching adjacent properties shall comply with all applicable ordinances and zoning performance standards. In the absence of an ordinance or zoning performance standard specifying sound limits at the boundary, or a law specifying different limits if limits are imposed, an adjacent property at the boundary shall not be subjected to a sound level greater than indicated in Table 807.3.1 because of the sound of the equipment. Where a generator is used only for providing emergency power and all periodic operational testing is done during the daytime period of Table 807.3.1, the sound of a generator during the night-time hours shall meet the daytime limits.
TABLE 807.3.1
MAXIMUM PERMISSIBLE OUTDOOR A-WEIGHTED SOUND LEVELS
INITIATING PROPERTYADJACENT PROPERTYMAXIMUM A-WEIGHTED SOUND LEVEL
(dB)
Day TimeNight Time
7:00 AM to 10:00 PM10:00 PM to 7:00 AM
All, except factory, industrial, or storageAll, except factory, industrial, or storage6555
Factory, industrial, or storageAll other, except factory, industrial, or storage6555
Factory, industrial, or storageFactory, industrial, or storage7575
807.3.2 Sound of HVAC and Mechanical Systems Within Buildings
Sound levels within rooms generated by HVAC and mechanical systems within the building, including electrical generators used regularly but excluding emergency generators, for all modes of operation shall not exceed the limits shown in Table 807.3.2.
TABLE 807.3.2
MAXIMUM PERMISSIBLE INDOOR BACKGROUND SOUND IN ROOMS
OCCUPANCY TYPEROOMNOISE CRITERIA (NC) LIMITS
Assembly A-1Symphony, concert, recital halls30
Motion picture theaters40
Assembly A-3Places of religious worship, lecture halls not part of educational facilitie35
Art gallery, exhibit hall, funeral parlor, libraries, and museums40
Courtroom35
Educational occupancies above 12th grade(See Educational)
Assembly A-4Gymnasiums, natatoriums and arenas with seating areas45
Business BOffice—enclosed greater than 300 square feet35
Office—enclosed less than or equal 300 square feet40
Office—open plan45
Corridors and lobbies45
Conference rooms35
Educational occupancies above 12th grade(See Educational)
Educational ECore learning lecture and classrooms that are less than or equal to 20,000 cubic feet in volume
Core learning lecture and classrooms that are greater than 20,000 cubic feet in volume
Open plan classrooms
Administrative offices and rooms
Music teaching studios
Music practice rooms
ANSI/ASA S12.60-2010/Part 1
or
ANSI/ASA S12.60-2009/Part 2
Institutional I-2Wards
Private and semi-private patient rooms
Operating rooms
Corridors and public areas
2010 FGI-ASHE Guidelines for
Design and Construction of
Healthcare Facilities
Rooms or suites25 to 35
Bathroom, kitchen, utility room40
Residential R-1
and R-2
Meeting rooms35
Corridors and lobbies45
Service areas45
For SI: 1 square foot = 0.093 m2, 1 cubic foot = 28.31 L.
807.4 Structure-Borne Sounds
Floor and ceiling assemblies between dwelling rooms or dwelling units and between dwelling rooms or dwelling units and public or service areas within the structure in occupancies classified as Group A1, A2, A3, B, E, I, M or R shall have an impact insulation classification (IIC) rating of not less than 50 where laboratory-tested and 45 where field-tested when tested in accordance with ASTM E 492. New laboratory tests for impact insulation class (IIC) of an assembly are not required where the IIC has been established by prior tests.
807.5 Special Inspections for Sound Levels
An approved agency, funded by the building owner, shall furnish report(s) of test findings indicating that the sound level results are in compliance with this section, applicable laws and ordinances, and the construction documents. Discrepancies shall be brought to the attention of the design professional and code official prior to the completion of that work. A final testing report documenting required testing and corrections of any discrepancies noted in prior tests shall be submitted at a point in time agreed upon by the building owner, or building owner's agent, design professional, and the code official for purposes of demonstrating compliance.
807.5.1 Testing for Mechanical and Electrical Generator Equipment Outside of Buildings
Special inspections shall be conducted in accordance with Section 903.1 to demonstrate compliance with the requirements of Section 807.3.1. Testing shall be conducted following the complete installation of the equipment or generators, the installation of sound reduction barriers, and balancing and operation of the equipment or generators. Testing shall be at locations representing the four cardinal directions from the face of the project building. Such testing shall demonstrate that the equipment is capable of compliance with the night-time limits under normal night-time operating conditions, and if higher sound levels are possible during the daytime, compliance with the daytime limits shall also be demonstrated.
807.5.2 Testing for Building System Background Noise
Special inspections shall be conducted in accordance with Section 903.1 to demonstrate compliance with the requirements of Section 807.3.2. Testing shall be executed within not less than 50 percent of the total number of rooms contained in a building or structure of the types listed in Table 807.3.2 for the given occupancy in accordance with Table 903.1. Testing shall occur following the complete installation of the equipment and systems, the installation of any sound reduction barriers, and balancing and operation of the equipment and systems.
807.5.3 Separating Assemblies
Wall and floor-ceiling assemblies that separate a mechanical or emergency generator equipment room or space from the remainder of the building shall have a sound transmission class (STC) of not less than 60 determined in accordance with ASTM E 90 and ASTM E 413, or for concrete masonry and clay masonry assemblies as calculated in accordance with TMS 0302 or as determined in accordance with ASTM E 90 and ASTM E 413.
807.5.4 HVAC Background Sound
HVAC system caused background sound levels for all modes of operation within rooms shall be in accordance with the lower and upper noise criteria (NC) limits as shown in Table 807.3.2. Special inspections shall be required and conducted in accordance with Section 903.1 in order to demonstrate compliance.
807.6 Special Inspections for Sound Transmission
An approved agency, employed by the building owner, shall furnish report(s) of test findings indicating that the results are in compliance with this section and the construction documents. Discrepancies shall be brought to the attention of the design professional and code official prior to the completion of that work. A final testing report documenting required testing and corrections of any discrepancies noted in prior tests shall be submitted at a point in time agreed upon by the building owner, or building owner's agent, design professional, and the code official for purposes of demonstrating compliance.
Exception: Test reports are not required for approved assemblies with an established sound transmission class (STC) rating.
807.6.1 Testing for Mechanical and Emergency Generator Equipment Outside of Buildings
In accordance with Section 807.3.1, all mechanical and emergency generator equipment shall be field tested in accordance with Table 903.1. Testing shall be conducted following the complete installation of the equipment or generators, the installation of sound reduction barriers, and balancing and operation of the equipment or generators. Testing shall be at locations representing the four cardinal directions from the face of the project building. Such testing shall occur on a Tuesday, Wednesday or Thursday at both the day and night times within the periods shown in Table 807.3.1.
807.6.2 Testing for Building System Background Noise
Testing shall be executed in accordance with Section 807.3.1 within not less than 50 percent of the total number of rooms contained in a building or structure, exclusive of closets and storage rooms less than 50 square feet (4.65 m2) in area, and exclusive of toilet facilities in accordance with Table 903.1. Testing shall occur following the complete installation of the equipment and systems, the installation of any sound reduction barriers, and balancing and operation of the equipment and systems.

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