Which property is a critical consideration in the design of curtain walls regarding fire safety?

Fire resistance ratings are a critical consideration in the design of curtain walls because they directly impact how the structure can withstand fire exposure and prevent the spread of flames and smoke. Curtain walls, which are non-structural cladding systems, must be designed with materials and systems that comply with fire safety codes and standards. The fire resistance rating indicates the duration for which the wall can prevent the passage of fire and hot gases, usually expressed in hours.

This rating is crucial for ensuring the safety of occupants and maintaining structural integrity during a fire event. It helps in determining how the curtain wall interacts with fire barriers and other building components to manage fire risks effectively. Incorporating materials with adequate fire resistance ratings into curtain wall design is essential for compliance with local regulations and for the safeguarding of the entire building's safety strategy.