Choosing the right material is essential with maintaining the integrity of firestop joints.

Passive Fire Protection measures are intended to contain a fire in the fire compartment of origin, thus limiting the spread of fire and smoke for a limited period of time, as determined the local building code and fire code. Passive fire protection measures, such as fire-stop, fire walls, and fire doors, are tested to determine the fire resistance rating of the final assembly, usually expressed in terms of hours of fire resistance (e.g. 1, 2, 3, 4 hour). A certification listing provides the limitations of the rating.