In every application, the importance of fire stopping - sealing any gaps in fire resistant constructions - is vital to maximize its ability to save life and property. Such gaps include service penetrations through walls and floors, either due to poor workmanship or left for structural movement.
Concealed spaces or cavities in the construction of a building provide ready route for smoke and flame spread. This is particularly so in the case of voids in, above and below the construction of a building, e.g. wall, floors, ceilings, roofs and facades. As any spread is concealed, it presents a greater danger than would a more obvious weakness in the fabric of the building.
It is important to note that every service passing through fire resistant building elements reacts in a different way in the event of fire, so there is no single system, solution or product that will protect all services.