What is the function of fill material in firestopping?

The function of fill material in firestopping is primarily centered around its ability to seal openings against fire and smoke. When materials are installed in wall or floor penetrations, they act as barriers to prevent the spread of flames and hot gases from one compartment to another, which is crucial for maintaining the integrity of fire-rated assemblies. Effective firestopping systems utilize fill materials designed for this purpose, ensuring that they can withstand high temperatures and resist both combustion and smoke passage.

Firestopping fill materials are crucial in maintaining safety and compliance with building codes and fire protection standards. By effectively sealing these openings, they help protect the overall structure and the occupants within by inhibiting the movement of fire and smoke, which can be detrimental in emergency situations. The other options do not address the primary role of fill materials within the context of firestopping, which is specifically aimed at enhancing safety through barrier creation.