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Firestop is a system that works to contain the spread of flames, smoke and heat in the event of a fire It is used in commercial and residential buildings, particularly in wall openings and around penetrations such as ducting, piping and wiring bundles. Firestop systems help preserve the integrity of walls and ceilings and can be used to compartmentalize a building, creating fire-resistant boundaries that can provide more protection. The best examples of firestop are: 1. Intumescent Firestop: This type of firestop uses an intumescent material that expands when exposed to heat to fill gaps in walls, floors and ceilings and seal them off from fire and smoke. It is available in a variety of forms and is commonly used for penetrations, wall openings and gaps between walls and ceilings. 2. Sprayed Firestop: This type of firestop is sprayed onto surfaces as a liquid or foam to create a fire-resistant barrier. It has the flexibility to be used in small, hard-to-reach areas, and it can also be used to form shapes or conform to contours in walls and ceilings, such as around electrical and plumbing pathways. 3. Hybrid Firestop Systems: Hybrid firestop systems involve the use of two or more firestop products to provide additional layers of protection. These systems are commonly used to compartmentalize larger areas, such as multiple floors in a building, and they can also be used to stop the spread of flames and smoke along pathways. 4. Fire-Rated Caulks: Fire-rated caulks are used to seal gaps and cracks around penetrations and wall openings. These products come in a variety of materials, such as silicone and acrylic, and they have been tested to provide up to four hours of fire protection. 5. Fire-Rated Putty: Fire-rated putty is a pliable clay-like material that is used to fill gaps and cracks in walls and ceilings to create a fire-resistant barrier. It is often used around penetrations, such as plumbing and wiring runs, and it has been tested to provide up to two hours of fire protection.