How is 'compression' related to firestop systems?

Compression is closely tied to the performance of firestop systems, particularly in how these systems function in the event of a fire. When a fire occurs, components of a firestop system are designed to react to heat and flames. The ability of the joint to close during a fire is crucial because it helps to prevent the spread of fire, smoke, and toxic gases through openings in walls and floors.

As materials in the firestop expand or char under heat, the compression ensures that these components effectively fill the gap and maintain a barrier. This action is essential for enhancing fire resistance and protecting building occupants and property. The compressive properties of firestop materials, therefore, play a significant role in their effectiveness and the overall integrity of fire safety measures in buildings.

In contrast, the other options address aspects of material properties or installation techniques but do not specifically relate to the critical function of preventing fire spread through the effective closing of joints during a fire.