What is the main purpose of fire-resistive joint systems?

The primary purpose of fire-resistive joint systems is to maintain the fire-resistance rating across joints in assemblies. This is crucial for ensuring that when a fire occurs, the integrity of the fire-resistive barrier is preserved, preventing the spread of flames, heat, and toxic smoke from one area to another. Fire-resistive joint systems are specifically designed to accommodate movement while still providing a barrier that meets the established fire rating. This allows for structural flexibility while maintaining safety standards, which is vital in the design and construction of buildings to enhance overall fire safety.

Other options, while they may address important elements of building design or fire protection, do not capture the specific and essential role that fire-resistive joint systems play in safeguarding against fire hazards.