What action should be taken if there is a 2" gap between a chimney and the lower floor ceiling rafters?

The appropriate action in this scenario involves addressing the 2" gap between the chimney and the lower floor ceiling rafters as a fire safety issue. It is critical to maintain proper clearance around chimneys to prevent the risk of fire, as chimneys can reach very high temperatures during operation. The gap should be fire-stopped with metal flashing, as this material is designed to withstand high temperatures and to provide a barrier that minimizes the risk of fire spreading from the chimney to combustible materials in the structure, such as wooden rafters.

Fire-stopping is an important aspect of building safety, particularly in areas where flues and chimneys are present. By using appropriate materials like metal flashing, it ensures that the space around the chimney is adequately sealed, reducing the chances of heat transferring to nearby combustible surfaces. This action aligns with national building codes and safety standards, reinforcing the importance of fire safety in residential structures.