Which construction type is often referred to as "protected"?

Type II-A construction is often referred to as "protected" because it involves buildings that are constructed with non-combustible materials while providing a certain level of fire resistance. This construction type is designed to limit the potential for fire spread and support structural integrity during a fire event.

In Type II-A, the structural elements, including the frame, walls, and floors, are made from materials that do not easily ignite, such as steel and concrete, and the assembly is designed to endure a specified fire-resistance rating. This protection enhances the overall safety of the building, particularly in terms of allowing occupants more time to evacuate and providing firefighters the opportunity to engage safely in extinguishment efforts.

The other construction types listed do not typically include the same level of fire protection or use non-combustible materials to the extent seen in Type II-A. Type I is also a protected type but is characterized by its use of reinforced concrete and steel, while Types IV and V generally do not offer the same level of fire resistance and may involve combustible materials that increase fire risk.