Partitions that demise an Assembly Occupancy of what size or greater must be 1-hour fire rated?

The requirement for partitions that separate assembly occupancies is based on fire safety regulations outlined in codes such as the International Building Code (IBC). For assembly occupancies larger than a specific size, fire-rated partitions are necessary to help contain possible fire and smoke, thereby ensuring the safety of the occupants.

In this case, a partition that demises an assembly occupancy of 750 square feet or greater must be 1-hour fire rated. This threshold helps to limit the spread of fire and provides occupants with sufficient time to evacuate in the event of an emergency. The reasoning behind the 750 square feet limit reflects a balance between safety needs and practical design considerations for assembly spaces, as larger assembly areas can pose increased risks in the event of a fire due to the higher number of occupants.

Other options present larger sizes, but they do not meet the specific criteria established in the building codes for fire rating requirements of assembly occupancies. Understanding these thresholds is crucial for compliance with safe building practices and fire prevention measures within design projects.