Fire-resistant joint systems are not required for which of the following?

Fire-resistant joint systems are designed to prevent the spread of fire and smoke, and they are typically required in areas where fire separation is crucial for safety and compliance with building codes. However, there are specific scenarios where these systems may not be mandated.

In the context of the provided options, floors within a single dwelling unit typically do not require fire-resistant joint systems because they are considered part of a private living space where the risk of fire spreading to other units is significantly lower. Fire codes often recognize that the design of residential units offers some inherent separation.

Similarly, floors within malls and mezzanine floors also may not necessitate fire-resistant joint systems under certain design configurations and local regulations. Malls, being commercial spaces, may implement different fire safety measures based on their overall fire protection strategy and occupancy load, while mezzanines that are fully enclosed and compliant with specific safety regulations might not require these systems either.

Given these factors, specifying a need for fire-resistant joint systems would depend on the occupancy type, the building's overall fire safety plan, and local code requirements. In this case, it is accurate to state that fire-resistant joint systems are not required for floors within a single dwelling unit, floors within malls, and mezzanine floors, thus justifying the