What is a typical sign that a firestop system may have failed?

A typical sign that a firestop system may have failed is the presence of visible cracks or gaps. These physical signs indicate that the integrity of the firestop has been compromised, which can allow fire, smoke, and toxic fumes to spread through openings in fire-rated assemblies. The purpose of a firestop system is to prevent the passage of fire and smoke between compartments; therefore, any visible defect in the firestop material is a clear indication that it may no longer provide the necessary protection.

In contrast to the correct answer, an unchanged appearance, intact sealant surfaces, and consistent heat resistance do not indicate a failure. An unchanged appearance and intact sealant surfaces suggest that the firestop system may still be functioning as intended, while consistent heat resistance implies that the materials are still performing well under thermal conditions. However, any visible physical alterations, like cracks or gaps, are strong indicators of failure that necessitate immediate attention.