For nonbearing exterior walls in Group R occupancies with a separation distance of less than 5 feet, what is the minimum fire-resistance rating required?

In Group R occupancies, nonbearing exterior walls that are located a distance of less than 5 feet from the property line are subject to specific fire-resistance requirements to mitigate the risk of fire spreading to adjacent properties. The minimum fire-resistance rating required for these walls is 1 hour. This requirement is established to provide a basic level of protection for nearby structures and to ensure occupant safety.

Walls with a 1-hour fire-resistance rating can help to contain fires within the building while providing sufficient time for occupants to evacuate safely and for firefighters to respond. This rating allows for various construction materials and methods that can achieve compliance while still being cost-effective and practical for residential occupancy settings. The adherence to this standard helps to balance fire safety with the realities of building design, particularly in urban or densely populated areas where buildings may be in close proximity to one another.