IBC 311.1.1 Accessory Storage Spaces - Did You Know?

[jar546]

311.1.1 Accessory storage spaces.​

A room or space used for storage purposes that is accessory to another occupancy shall be classified as part of that occupancy.

This provision allows accessory storage areas to be classified in the same occupancy group as the primary occupancy of a space. There are no limits on the size of such spaces, nor how much of the floor area such accessory storage can occupy. These storage spaces could occur in any occupancy, such as a Group B office building, a Group E classroom or a Group M retail store. If the storage isn't accessory to a primary use, then the storage would be classified in one of the Group S categories and Section 508 would be applicable as a mixed occupancy. The Table 509.1 separation requirement for incidental uses would apply to storage rooms over 100 square feet (9.3 m2) in Group I-2 or ambulatory care facilities.

 

[Feanor]

311.1.1 Accessory storage spaces.​

A room or space used for storage purposes that is accessory to another occupancy shall be classified as part of that occupancy.

This provision allows accessory storage areas to be classified in the same occupancy group as the primary occupancy of a space. There are no limits on the size of such spaces, nor how much of the floor area such accessory storage can occupy. These storage spaces could occur in any occupancy, such as a Group B office building, a Group E classroom or a Group M retail store. If the storage isn't accessory to a primary use, then the storage would be classified in one of the Group S categories and Section 508 would be applicable as a mixed occupancy. The Table 509.1 separation requirement for incidental uses would apply to storage rooms over 100 square feet (9.3 m2) in Group I-2 or ambulatory care facilities.

Worth noting that this accessory or ancillary space to the main occupancy should be designed based on its use. Example: The storage occupant load factor will be 300 net sf per person. Would you be so kind to describe the case in which the room becomes a separate occupancy? what would make it become separate and not ancillary?
Thanks.