Mezzanine Area | Non-Structural--Int'l Bldg & Resid'l Codes | Forum

International Building Code (IBC) 2000 defines "mezzanine" as "intermediate floor or floor between floor and ceiling". Total floor area should not exceed 1/3 of the room or space with the floor or floor. Does that mean? Is it less than a third of a story? ! (Penthouse is less than a third of the story's rooftop area)

The mezzanine is considered the second floor and the second floor of the building code is necessary if the following conditions are satisfied.

It occupies 33 1/3% of the horizontal plane between the mezzanine and the floor area it occupies (ie where the continuous floor occurs) (66 2/3% of industrial applications for building types I and II) ), Or

The mezzanine floor of the enclosed space under the mezzanine can not exceed one-third of the room's enclosure and a part (generally) of the mezzanine is located

Please note the difference from the previous SBCCI definition that solves the enclosed space under the mezzanine because it is not included in determining the size of the room or space where the mezzanine is located. In the definition of IBC there is clearly no space under the mezzanine clause and the SBCCI part (which is also missing) makes it possible to open the stairs from the mezzanine and the bottom space is closed, but smoke is detected To

The mezzanine is considered a part of the lower floor. The space available below the mezzanine is on the top of the mezzanine, and the space underneath is open to open buildings etc. to absorb traffic congestion. The underlying floor part is essentially converted to mezzanine due to dual function. Using two levels as empty spaces (eg, enclosed spaces) is a two-story function, not a mezzanine function.

For safety and accessibility, you may need stairs and handrails. Publically accessible mezzanines must meet specific specifications for stairs, staircase wells, stairway extensions, and guardrail spacing. If the mezzanine floor is used only as a storage room - the public is unavailable - and then it has another code set. Please check code execution in your area for details

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