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Title: Section 507  •  Size: 4004

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A mezzanine need not be counted as a story for determining the allowable number of stories when constructed in accordance with the following:

1. The construction of a mezzanine shall be consistent with the requirements for the type of construction in which the mezzanine is located, but the fire-resistive time period need not exceed one hour for unenclosed mezzanines. The clear height above and below the mezzanine floor construction shall not be less than 7 feet (2134 mm).

2. There shall not be more than two levels of mezzanines in a room. However, there is no limitation on the number of mezzanines within a room.

3. The aggregate area of mezzanines within a room shall not exceed one third of the area of the room in which they are located.

4. All portions of a mezzanine shall be open and unobstructed to the room in which they are located, except for columns and posts and protective walls or railings not more than 44 inches (1118 mm) in height.

EXCEPTIONS: 1. Partitioning may be installed if either of the following conditions exist:

1.1 The aggregate floor area of the enclosed space does not exceed 10 percent of the mezzanine area

1.2 The occupant load of the enclosed area of the mezzanine does not exceed 10.

2. A mezzanine having two or more exits need not be open into the room in which it is located, provided at least one of the exits gives direct access to a protected exit corridor, an exit court, enclosed exit stairway, exterior exit, exterior exit balcony or exit passageway.

3. In industry facilities, mezzanines used for control equipment may be glazed on all sides.

5. Two exits shall be provided from a mezzanine when two exits are required by Table 10-A.

6. If any required exit enters the room below, the occupant load of the mezzanine shall be added to the occupant load of the room in which it is located.

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