What firestop material is typically used for cables passing through walls?

When considering the appropriate firestop materials for cables that pass through walls, it's essential to recognize that multiple materials can serve effectively for this purpose. Mineral wool, cementitious material, and putty are all designed to help resist the passage of fire and smoke between spaces.

Mineral wool is often used because it has excellent thermal resistance and can fill around cables effectively, providing a barrier to heat transfer. Cementitious materials can also be applied around cables to create a strong and durable firestop seal, capable of withstanding high temperatures. Putty, specifically formulated for firestop applications, can be used to seal around individual cables or groupings, providing flexibility and ease of application while also providing effective fire resistance.

Since all these materials can be effectively utilized depending on the specific conditions and requirements of the installation, and they each contribute to maintaining the integrity of the fire-rated assembly, the correct answer acknowledges that all of these materials play a role in firestopping for cables in walls.