Some type 1 buildings have climate control systems and self-pressurized staircases to prevent fires from spreading. These elements of the building make it easier for firefighters to access and extinguish fires. When entering a type 1 building, your main purpose revolves around securing the stairs to ensure a safe evacuation. Walls and frames can be constructed with any material permitted by the code with a V-type construction, usually wood.
However, they provide lower fire resistance and do not resist the effects or spread of fire as well as type I. Each type of construction is associated with different building elements, each of which varies in terms of fire resistance. A hotel built with a Type V construction could be just 7,000 square feet, for example, while a Type IV heavy-wood hotel could have 20,000 square feet. The type of activities carried out within a structure can help determine if V-type timber frame construction is an option.
Many new or recently renovated commercial structures, including large stores and large shopping centers, are type 2 buildings. Depending on the roof system, they may also rely on similar ventilation operations for type III and type IV constructions. Like type 1 buildings, type 2 buildings contain non-combustible walls, partitions, columns, floors and roofs. When firefighters encounter type 1 buildings, they must secure the stairs to ensure a safe evacuation.
However, those who work in it know that the industry is still very organized, divided into specific types of construction and processes. A V-B type construction, the most basic, does not require a fire resistance index for any of the building's elements. Hospitals or jails where occupants are confined and unable to leave on their own may require more stringent types of construction, even such as single-story buildings. The size requirements are similar to those of Type III and, although construction materials are classified as non-combustible, they provide less fire resistance than Type I, and a fire that spreads would likely cause more damage.
Type III exterior building walls are constructed with bricks, masonry, concrete blocks, prefabricated panels, or other non-combustible materials. Understanding these types of construction gives any construction worker or firefighter a basic understanding of how these structures come together. The fire resistance rating assigned to wood and other materials associated with type IV and V construction often varies depending on thickness.