What is a mezzanine?
“Non-Engineer” Answer: A Mezzanine Is A Landing Or A Partial Floor Between Floors
Explanation: A mezzanine is not counted as its own floor and does not add to the total number of floors within the building when it meets certain criteria .
Commentary: The criteria that allow for a mezzanine requires that it be constructed of the same type of materials and fire resistance rating as the the building in which it's locatred. Building codes limit the total floor area of a mezzanine to no more than 1/3 to 1/2 of the floor area that the mezzanine looks down upon , and require it to be open to the floor below except for walls not more than 42" high. This last requirement has been relaxed and full height walls are allowed if the occupant load is less than 10 or in some sprinklered buildings meeting specific egress criteria.
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