What is commonly used to seal penetrations in fire-rated concrete floors?

The use of cast-in place fire-stops is essential for sealing penetrations in fire-rated concrete floors to maintain the fire-resistance rating of the assembly. Fire-stops are specifically designed materials that prevent the spread of fire, smoke, and hot gases through penetrations and openings in fire-rated assemblies. They are installed during the construction phase, often in locations where pipes, ducts, or electrical conduits pass through these floors.

When using cast-in place fire-stops, the materials used typically have a high fire-resistance rating and are tested to ensure they comply with building codes and standards related to fire safety. This ensures that the integrity of the fire-rated floor is maintained, thereby enhancing the safety of the building occupants.

Other materials like patching compounds, aluminum foil, and epoxy resin do not provide the same level of fire protection or are not designed specifically for this purpose. Patching compounds may fill gaps but may not be suitable for fire resistance. Aluminum foil does not adhere to fire safety standards for sealing penetrations, and while epoxy resin has various applications, it doesn't serve the same role in fire-rated assemblies.