Which term describes the width of the space where a firestop is applied?

The term that describes the width of the space where a firestop is applied is "Nominal Joint Width." This term refers to the measured or intended width of a joint that is to be filled or sealed with a firestop solution. This characteristic is crucial for ensuring that the firestop material can adequately fill the void, preventing the passage of smoke and flames in the event of a fire.

Understanding nominal joint width is important in the context of firestop installations because it helps ensure that the right amount of firestop product is used to achieve effective fire resistance. Proper application based on this measurement contributes to the overall fire safety of a building by maintaining the integrity of fire-rated assemblies.

Other terms listed, such as "Effective Depth," "Fire Gap," and "Duct Width," are related concepts, but they do not specifically reference the width of the space for firestop application. Effective Depth often pertains to the thickness of a firestop in relation to how deep it can penetrate into a joint or opening. Fire Gap is a more general term that can refer to any unsealed opening, while Duct Width is specific to the dimensions of ductwork rather than the firestop itself.