What is a primary purpose of firestop systems in building construction?

The primary purpose of firestop systems in building construction is to prevent fire and smoke from spreading. Firestop systems are specifically designed to compartmentalize areas within a structure, enhancing the overall fire-resistance rating of walls, floors, and ceilings. By sealing penetrations and openings in fire-rated assemblies, these systems help contain fires to the area of origin, delaying the spread of flames and smoke. This is crucial for maintaining safe egress routes for occupants and facilitating emergency response efforts.

Other options, while potentially relevant in broader contexts, do not reflect the fundamental role of firestop systems. For instance, enhancing a building's exterior design focuses on aesthetic considerations rather than fire safety. Similarly, reducing pollutant emissions during a fire does not relate directly to firestop systems, which primarily address fire containment rather than environmental impact. Lastly, while the containment of hazardous materials is important during construction, it is not the primary function of firestop systems, which are focused on fire safety.