For metal mullions, at what height in feet must they be protected with fire-resistance materials?

The requirement for protecting metal mullions with fire-resistance materials typically arises from building codes and regulations that address fire safety in construction. In many jurisdictions, metal mullions that exceed a certain height must be equipped with fire-resistance rated materials to prevent the spread of fire between compartments and to maintain the structural integrity of the building during a fire.

The correct height specified at which metal mullions must be protected is often set at 12 feet. This threshold is significant because it complies with building codes designed to enhance fire safety and structural stability in taller buildings. Fire-resistance materials can include various types of coatings or surrounding materials that provide insulation against extreme heat and maintain the integrity of the mullions during a fire scenario.

Understanding the specific height requirements is crucial for compliance with local fire codes and improving the overall safety of structures, especially in multi-story buildings where the risks associated with fires can increase with height. Building professionals must be familiar with these specifications to ensure they implement appropriate safety measures in their designs and constructions.