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

The maximum fire rating for a door in a stairway rated for 1 hour is indeed 1 hour. This is aligned with fire safety codes that dictate that the door's fire protection rating must match or be less than the rating of the stairway itself. A stairway that is rated for 1 hour is designed to contain fire and smoke for that duration, ensuring safe egress from the building during a fire event.

In this context, a door rated for a maximum of 1 hour serves to maintain the integrity of the stairway's fire-resistance rating. Ratings above this threshold would potentially compromise the intended safety features of the stairway and do not align with standard code regulations, which typically require that all fire-protective components share or fall below the rating of the surrounding structures. Therefore, a 1-hour rating for the door is the appropriate choice to achieve the desired fire safety goals of the structure.