definition
strict definition
missing floor
A floor level which does not exist, and is skipped in a building's numbering system.
A missing floor is an imaginary level of a building, whose assigned number between those of existing levels is skipped in the building's numbering system. Common examples are floors in Chinese buildings ending with the digit '4', or 13th floors in Western buildings.
While this floor type does not describe an actual physical object, it is sometimes used for reference purposes or diagrammatic purposes.
The missing element is a number in the naming sequence, not a physically absent slab or a destroyed story. Consecutive physical floors can therefore have a missing numbered floor between their labels.
Related definitions
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attic
A floor level where regular human movement is impeded by the shape of the roof above it. -
basement
An underground floor level of regular height, suitable for human movement or occupancy. -
crawl space
A partial floor level less than 2 meters high, with insufficient headroom for most adults to walk upright. -
garden floor
An otherwise regular floor partly below and partly above the surrounding ground surface at the building perimeter. -
mechanical floor
A full floor level above ground filled with mechanical equipment and not generally accessible to occupants. -
mechanical penthouse
A mechanical floor level at the top of a building which is set back from the building's perimeter. -
mezzanine
A floor level above ground which does not fill the entire space within the building's perimeter. -
ramped floor
A floor level above ground, with a sloping floor surface which connects to other levels. -
regular floor
A normal and occupiable floor level which is fully above the base level of a building or structure. -
stem level
A level in the stem of a tower or a building, with no greater extent than a stairway landing or the equivalent. -
unaligned floor
A floor level which is vertically offset from adjoining floor levels by at least half a meter.