Sealing the compartment walls is an important step in the fire stopping process. It means that any gaps or openings in the walls are sealed off to prevent the spread of fire and smoke to other areas of the building.

This is essential in providing a safe escape route for occupants and preventing damage to the building. Sealing can be done using various materials such as fire-resistant sealants, intumescent sealants, and fire-resistant boards. It is important to ensure that the sealing materials used are appropriate for the specific application and that they comply with relevant building codes and regulations.

Overall, sealing the compartment walls is a crucial aspect of fire safety and should be carried out by qualified professionals to ensure its effectiveness.