What materials are used for grouting fire doors?

2022-08-02

What Materials Are Used for Grouting Fire-Rated Doors?

A fire-rated door is a door assembly that satisfies the requirements of fire stability, integrity and insulation for a specified duration. It serves as a fire separation component installed between fire compartments, at evacuation stairwell entrances, vertical shafts and other locations where fire resistance is required. To boost the fire and heat insulation performance of fire-rated doors, grouting is carried out inside door frames. So what materials are used for grouting fire-rated doors?

What Materials Are Used for Grouting Fire-Rated Doors?

Generally speaking, cement mortar is adopted as the grouting material for fire-rated doors.
  1. Grouting operation method

    Cut two plastic bottles and keep the upper parts. Fill them with cement mortar and pour the mortar into the reserved grouting holes of the door frame. Continuously compact the mortar with a stick to achieve full compaction. After filling, wipe residual mortar off the door frame with a rag.

    Alternatively, a cement grout gun can be used: load mortar into the gun and inject it into the grouting holes directly.
  2. Grouting for door threshold

    Fine aggregate concrete shall be used for grouting both sides of the fire door threshold, with a grouting height reaching approximately 70% of the total threshold height. This construction complies with the fire integrity and insulation criteria for fire-rated doors.
  3. Functional principle of frame grouting

    Filling door frames with cement mortar provides excellent structural rigidity support under fire exposure, preventing frame deformation. This avoids excessive gaps between the frame and door leaf that would allow flame penetration. The grout fixes the frame firmly and prevents frame detachment during a fire, ensuring the door meets mandatory fire integrity and insulation standards.
Grouting is a standardized construction procedure for fire-rated doors. Only complete grouting can form an intact thermal barrier and avoid functional failure. Therefore, fire-rated doors must satisfy the requirements of structural integrity and heat insulation.
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