What is the required fire rating for a door in a 1-hour rated stairway?

In a 1-hour rated stairway, the fire resistance rating of the door must match the rating of the stairway itself, which is 1 hour. This requirement ensures that the door provides the same level of protection as the stairway, helping to contain smoke and fire within the designated area and providing safe egress for occupants. The integrity of both the stairway and the door is crucial in maintaining a protected exit route during a fire emergency. Therefore, specifying a door with a fire rating of 1 hour is essential for compliance with fire safety codes and for ensuring occupant safety.