According to NFPA, what is the requirement for fire rating between units in R-2000 duplexes?

In R-2000 duplexes, according to NFPA (National Fire Protection Association) guidelines, the requirement is that the fire rating must extend into attics and soffits. This is crucial for maintaining the overall safety and fire resistance of the building structure, particularly in multi-unit residences where fire can easily spread between living spaces.

The rationale behind this requirement is to ensure that any potential fire originating in one unit cannot easily transfer to another unit through common spaces such as attics or soffits, which are often overlooked in fire protection planning. By extending the fire rating to these areas, it creates a more robust barrier against the spread of flames and smoke, thereby enhancing the safety for all residents within the duplex.

This aligns with the NFPA's focus on preventing fire spread and ensuring that adequate barriers are in place to protect occupants and property. It also underscores the importance of considering all structural elements when designing fire safety measures in residential buildings.