If a wall has a fire-resistance rating of 1.5 hours, what is the appropriate rating for its door assembly?

The appropriate fire-resistance rating for a door assembly in a wall that has a fire-resistance rating of 1.5 hours is important for ensuring the overall integrity and performance of the fire-rated barrier. In general, the door assembly's fire rating should be equal to or less than the fire-resistance rating of the wall to maintain the effectiveness of the fire partition.

A door assembly with a fire-resistance rating that matches the wall's rating of 1.5 hours is optimal, as it prevents fire from passing through the opening and allows occupants more time for safe evacuation. This creates a cohesive unit that works together to contain fire and smoke.

Choosing a rating of 1 hour for the door assembly is often seen as insufficient given that it does not fully align with the wall's rating. Therefore, ensuring the door has a fire-resistance rating that is equal to the wall's, at 1.5 hours, directly supports the fire safety goals of the space and complies with fire safety codes and standards.