The definition for means of egress uses "occupied portions" and not "occupiable space," which is defined by the IBC. The IBC Commentary states the following in regard to the definition for "occupiable space":north star said:**RLGA** [ and maybe others ] believes the toilet rooms within the R-1Occ. Group are classified as "occupiable"....ICC believes that the toilet
rooms are not occupiable[ RE: Answers: Toilet rooms are not considered
‘occupiable’ based on the definition of Occupiable Spaces in Chapter 2 ],
but WOULD require the hardware to be "egress compliant" [ <---- ?? ].
Occupiable spaces are those areas designed for human occupancy. It applies to both residential and nonresidential spaces alike. Most spaces in a building are occupiable spaces. Based on the nature of the occupancy, various code sections apply. All habitable spaces are also considered occupiable (see the definition of “Habitable space”); however, all occupiable spaces are not habitable. Additionally, some spaces are neither habitable nor occupiable. The code identifies crawl spaces, attics, penthouses and elevated platforms (mechanical or industrial equipment) as unoccupied spaces. Since the code generally states how these spaces must be accessed, but does not specifically require means of egress, they would not be occupiable spaces. If access is limited to maintenance and service personnel, it is likely that a space is not occupiable.
Bathrooms are not considered "habitable space," but that doesn't mean it wouldn't be considered "occupiable space." For me, a bathroom is designed for human occupancy, thus it is occupiable space, as well as "occupied portions" of a building as indicated in the means of egress definition.
Just my humble opinion...
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