Is two-inch nominal lumber an acceptable material for fire blocking?

Two-inch nominal lumber is indeed an acceptable material for fire blocking due to its ability to effectively resist the passage of flames and smoke within the walls, floors, and ceilings of a structure. Fire blocking is designed to interrupt the movement of fire within concealed spaces, such as wall cavities and between floors, thus limiting its spread and enhancing the overall safety of the building.

The use of two-inch nominal lumber provides the necessary structural integrity and durability to serve as a fire barrier. Its thickness allows it to be tightly fitted between framing members, which helps to create a continuous barrier that prevents fire from traveling through hidden spaces. Additionally, building codes often specify certain materials that can be used for fire blocking, and solid wood materials like nominal lumber meet these requirements.

While other materials and treatments can enhance fire resistance, in this context, general two-inch nominal lumber is sufficient for use in fire blocking applications as mandated by relevant codes and standards.