What is a firestop?

Firestop options can make any building — new or existing — safer for tenants while also limiting property loss from a fire. Proper firestop and smoke seal of fire-rated walls, floors, and ceilings, as well as penetrating items through rated walls, helps extend the time to safely evacuate a building in case of fire. Maintaining proper fire and smoke barriers also reduces fire and smoke damage.

A firestop is a fire protection system that seals the cracks and crevices of a space with fireproof material to help keep a fire from spreading between rooms. This is a crucial step in ensuring fire and smoke from spreading through multiple spaces quickly. Depending on the space and space requirements in your building, there are different materials you can use for firestops.


For sealing around pipes, tubing, and ductwork, you want to use Penetration Sealants that can hold a fire off for two to four hours. Joint Sealants are used to caulk the spaces between wall boards. They are intumescent, meaning the sealant swells up when fire is near or touching it, thus preventing the fire from getting through the cracks and spreading even further.


Another material that is used as a firestop, temporarily in big gaps or spaces is a thing called a Pillow. While this is a different type of pillow than what you sleep on at night, it does resemble a traditional pillow. This firestop pillow has a fire-resistant rating, and is normally made with rockwool batts, vermiculite, or intumescent foam rubber. It is used for holes in walls or in the floor to provide added protection.

Other Components

Composite sheets are used mostly for repairs in fire walls and can be customized and then sealed with the Penetration Sealant. Pipe Collars are put in place when plastic pipes are built through a wall or ceiling and need to be sealed up. The collars have intumescent material that automatically seals under the heat from fire. And, sleeves are metal pipes that are filled with intumescent putty that cords and cables can pass through easily.

Professional Assistance

TruTeam specializes in the selection and installation of the appropriate firestop and smoke seal systems for new and retrofit projects. We offer professional installation and extensive knowledge of firestop systems to every builder and building owner. With our joint and penetration firestop expertise and professional installation, we offer peace of mind and confidence in your firestop assembly.

For more information on firestops or for a free quote on insulation, contact TruTeam to find a branch near you. TruTeam believes that excellence in every step of the process and ensures timely completion and quality of service, time after time.

The Team You Can Trust

Get Free Quote
Map Icon
Nationwide Network
Helmet Icon
Safety First Culture
Person Icon
Thousands of Expert
Millions of Projects Completed

Ready To Get Started?
Contact our local branch today.

Get Your Quote