In firestop terminology, what does “dynamic” refer to?

In firestop terminology, "dynamic" refers to structures that allow movement or flexing. This is crucial in firestop systems because certain installations, such as those in areas where building components might expand or contract (for example, due to temperature changes), must accommodate some level of movement without compromising their fire-resistive capabilities. Dynamic firestop systems are designed to maintain their integrity even when subjected to these movements, which can occur in joints and penetrations within a building’s construction.

Understanding this concept is essential for ensuring that firestop installations remain effective in real-world conditions, where structural components may shift over time. This is particularly important in environments where significant thermal or mechanical stresses are expected.