Type I construction is the most fire-resistant classification. It is characterized by the use of non-combustible materials such as concrete, steel, and masonry for the structural elements. These materials offer a high level of fire resistance and are designed to withstand severe fire conditions. Buildings constructed with Type I construction include high-rise buildings, skyscrapers, and large commercial or institutional structures. These buildings typically have substantial fire protection systems, such as fire-rated walls, fireproofing materials, and sprinkler systems.