In non-Group R occupancies, what is the maximum horizontal area without draftstopping that is allowed?

In non-Group R occupancies, the maximum horizontal area allowed without draftstopping is indeed 1,000 square feet. The reasoning behind this regulation stems from fire safety principles that aim to limit the spread of smoke and fire within a building. Draftstopping is a measure used to compartmentalize a space, inhibiting the movement of smoke and heat through concealed spaces if a fire were to occur.

By allowing up to 1,000 square feet without draftstopping, code officials recognize a balance between ensuring safety and practicality in building design. If spaces exceed this area, it becomes increasingly critical to install draftstopping to effectively manage smoke spread and improve overall life safety in an evacuation scenario. This regulation reflects an understanding of how fire dynamics behave in building environments, ensuring that fire protection strategies remain effective. Therefore, the specification of 1,000 square feet serves as a standard safety measure in non-Group R buildings.