Seal openings in fire-resistant floors and walls to stop the spread of smoke and flames. Often used to fill gaps around pipes or conduit, this cement forms a rigid, tight-fitting shield. It’s heavier and messier to apply than fire-stop blocks or sheets, but it's an economical choice for covering a large area. You can also paint over this cement once it dries.

This cement comes as a powder—mix in water until you reach the consistency you need. The thicker the cement, the better it will stick to walls; thinner cement dries with a smoother finish on floors.

Cement in a pail is best for small, infrequent jobs. The pail is resealable and has a carrying handle.

Fill the space between plastic pipes and the fire-rated wall or floor they pass through. These collars are tested to ASTM and UL standards for preventing the spread of smoke and flames. They expand when heated, so they’ll fill any gaps left if your pipe melts or shrinks. Slip a collar over the end of your pipe and press into the opening in the wall or floor. If your pipe runs through a wall, seal both sides.

Cut these sheets to any size and shape you need to seal large openings in fire-resistant walls and floors. They’re often used to fill the space around pipes, conduit, and ducts. These sheets are tested to ASTM and UL standards for stopping the spread of smoke and flames. Made of steel, they have a firestop coating that expands when it’s heated. If the equipment passing through these panels melts or shrinks during a fire, this coating will fill the gaps.

Use shears to cut these panels to size, then fasten to your surface with No. 10 self-drilling sheet metal screws (not included). Fill any gaps around the sheet with fire-stop caulk (sold separately) for a tight seal. Once they’re installed, you can paint over them without losing fire protection.

Seal electrical boxes to maintain fire-resistant walls. These inserts mount inside electrical boxes to block the spread of smoke and flames. When heated, they expand to seal gaps, such as those left by melted wire. They fit common box sizes.

Use gaskets when cable or switches have already been installed. They sit just inside your cover plate.

Use pads before cable is installed. The adhesive side sticks to the back wall of your electrical box. They can be used only with metallic boxes.

Squeeze these foam plugs into the ends of pipe or conduit to fill the space around cables. When heated, they expand to fill any gaps left if the cables shrink or melt. They’re tested to ASTM and UL standards for stopping the spread of smoke and flames. Cut holes in these plugs to pass cables through, or use them to block the ends of unused pipe or conduit. Once they’re installed, you can paint them without losing fire protection.