A set of plans have been submitted for a building that contains
adjoining F-1 and S-1 occupancies. The documents do not show any
fire separation between the two occupancies, which is allowed by
Table 508.4 of the 2012 IBC. Are these occupancies considered
"separated" for the purpose of calculating allowable height and
Yes. Although the occupancies are not required to be physically
separated, for the purpose of building height and area only, they
are still evaluated under the separated option. These are
occupancies that share the same level of hazard with respect to fire
safety. It is possible, therefore, to have multiple occupancies that
comply with the separated use provisions that require no
separation between them.
But note that, where code requirements are based on established
fire areas, occupancies not separated must be considered as
sharing the same fire area.