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.

Smooth this tape over holes, gaps, and seams in fire-rated walls, floors, and ceilings to form a seal. It’s tested to ASTM and UL standards for stopping the spread of smoke and flames. It’s also watertight, so it prevents leaks if you need to extinguish a fire. Designed to resist vibration, this tape flexes with movement rather than cracking or pulling away from surfaces. To apply, cut to size and peel off the liner.

Stack these blocks around cables or pipes that run through fire-rated walls and floors. They’re made from compactible foam, so you can pack them in tightly to create a dense barrier. If a fire breaks out, they expand to seal any remaining gaps. These blocks are tested to ASTM and UL standards for stopping the spread of smoke and flames.

Blocks with hook and loop attachment strips can be locked together or taken apart easily, so they're good for creating temporary barriers. Their cover expands in two directions when exposed to flames. Do not cut these blocks, or they will lose their shape and fail to stop fire and smoke.

Cut-to-size blocks can be customized to fill odd-shaped openings. They expand in all directions when exposed to flames, so you can cut them without reducing their fire protection.

Use fire-stop caulk to seal small gaps between or around the blocks.