What does "sealant depth" indicate in a firestop system?

"Sealant depth" in a firestop system specifically refers to the distance from the surface of the assembly or joint being protected to the interior of the sealant material. This measurement is crucial because it affects how well the firestop system can perform under fire conditions.

When assessing the effectiveness of a firestop, one must consider how deep the sealant is applied; an insufficient depth may lead to reduced effectiveness in preventing the passage of fire, smoke, and gases. Proper sealant depth ensures that the firestop can withstand the thermal and physical stresses it may encounter during a fire, providing the necessary protection by forming an effective barrier.

In contrast, the other options do not accurately capture the specific definition of "sealant depth." While they discuss related aspects of firestop systems, they do not convey its specific measurement or the implications of that measurement for fire resistance.