Which classification do most metal buildings fall under?

Most metal buildings typically fall under Type II classification. This classification is characterized by non-combustible materials for structural elements, which can include steel frames and other metal components. Type II buildings often have limited combustible features and adhere to fire-resistance ratings that ensure structural integrity during a fire.

Type II construction is prevalent in commercial settings because it provides the necessary durability and fire resistance while allowing for a range of design possibilities. The use of metal as a primary material contributes to strength, reduces maintenance costs, and often leads to quicker construction times. This classification is especially effective in ensuring compliance with building codes that address safety and performance standards.

Type I is usually reserved for buildings constructed entirely of non-combustible materials which may include high-rise structures. Type III involves exterior walls of non-combustible materials but can have combustible interiors, whereas Type IV features heavy timber and is not commonly used for typical metal structures.