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For a Group A Occupancy building of Type I Construction with an automatic sprinkler system, what is the minimum fire resistance rating for roof-only supporting columns?

  1. 1 hour

  2. 2 hours

  3. 3 hours

  4. 4 hours

The correct answer is: 2 hours

The minimum fire resistance rating for roof-only supporting columns in a Group A Occupancy building of Type I Construction, equipped with an automatic sprinkler system, is established to ensure that the structure is adequately protected from fire exposure. In this context, a fire resistance rating of 2 hours is required for these columns, which provides a significant level of safety and allows for adequate evacuation time and structural integrity during a fire event. Type I Construction is typically defined by its non-combustible materials and higher fire resistance ratings, making it well-suited for Group A Occupancy, which includes assembly areas that can accommodate large numbers of people—such as theaters or auditoriums. The requirement for a 2-hour fire resistance rating for the roof-only supporting columns aligns with the goals of ensuring safety and minimizing the risk of structural failure under fire conditions. In contrast, lower fire resistance ratings would not provide the necessary protection against prolonged fire exposure, potentially jeopardizing occupant safety and structural integrity. This makes the 2-hour rating a critical standard in this context.