What is a primary function of curtain-wall systems in buildings?

A primary function of curtain-wall systems in buildings is to ensure fire resistance at perimeter interfaces. Curtain walls are non-structural building facades that are designed to protect the interior of the building from external elements, including fire. They help to compartmentalize fire, thereby preventing its spread through the building. This is especially crucial in high-rise buildings where fire can move from one floor to another quickly if there is not adequate fire resistance between floors and the exterior.

While curtain-wall systems do contribute to the aesthetics of a building, enhance insulation properties, and may provide some load support, their most critical role in relation to fire safety is preventing fire from breaching the perimeter, which is essential for occupant safety and the overall integrity of the structure in the event of a fire. Ensuring fire resistance is vital for compliance with building codes and regulations, which set standards for how different building components should perform in the event of a fire.