What is the fire-resistance rating required for a fire wall separating a Group A occupancy?

The fire-resistance rating for a fire wall separating a Group A occupancy is indeed 3 hours. This requirement is based on building codes and safety regulations that account for the occupancy type's potential fire load and the risk of fire spread.

Group A occupancies typically include buildings such as theaters, auditoriums, or other assembly areas where large numbers of people gather. Because of the high occupancy and potential for significant fire hazards, it is essential to have a robust fire-resistance rating to ensure the safety of occupants. A 3-hour fire-resistance rating allows adequate time for occupants to evacuate the building and for fire services to respond.

The other options do not align with the specific requirements for Group A occupancy, as a 1-hour or 2-hour rating would not provide sufficient protection in the event of a fire in such high-risk environments. A 4-hour rating, while it may seem appropriate, exceeds the established requirements for this occupancy type and is generally reserved for specific structural elements or conditions outlined in building codes. Hence, 3 hours is the appropriate and compliant rating for fire walls separating Group A occupancies.