What Is the Meaning of Type 5 Construction?


Any structure requiring a permit to build, alter or remodel must be classified by type of construction and occupancy. The International Building Code (IBC) is the foundation of the codes adopted by most municipalities. The IBC specifies five types of construction. Each is defined by the materials used to build it. Material requirements range from being totally noncombustible (Type I) to being constructed from any material allowed by the code (Type V).

Three Little Pigs

  • The IBC distinguishes the types with roman numerals: Types I, II, III, IV and V. The story of the Three Little Pigs illustrates the types of construction. Type V would be the straw house that fell in the beginning when the wolf huffed and puffed. Type IV would be the timber-framed house that took longer to blow down but still allowed the wolf access. Types I, II and III represent the brick house that withstood the wolf's attack. In the IBC, the wolf is fire.

Noncombustible Materials

  • Types I, II and III construction are classified by the noncombustible materials used to build the structure—steel, concrete and brick, for example. Types I and II are the most restrictive. Structural elements must be noncombustible and rated for fire resistance within the boundaries of the code.

    Type III construction requires noncombustible material on the exterior and specifies interior elements to be made from any allowed material.

Type IV

  • Type IV is the classification for heavy timber construction that uses noncombustible materials on the exterior, as well as interior construction of heavy timber or laminates that does not create a concealed space.

Type V

  • Type V construction is a fairly broad classification. It uses any structural element constructed from a material permitted by the code. Most wood-frame structures, including one- and two-family residences, fall in this category. Neither the exterior nor interior walls need to be of noncombustible materials, though some areas must be rated for fire resistance.

Further Classifications

  • The Types are further classified as A or B.

    Whereas A is rated as fire-resistant, B is not. Fire resistance is measured in the hours it takes for a fire to burn through the material. A Type V-A construction classification would require structural framing and bearing walls to have a one-hour fire-resistance rating, meaning a fire would take an hour to burn through the wall. Type V-B construction would have no fire-resistance rating necessary, making it the most combustible and susceptible to fire.

Related Searches


  • Photo Credit new homes under construction image by Paul Hill from Fotolia.com
Promoted By Zergnet


You May Also Like

  • Types of Bracings Used in Construction

    Wall bracing is a construction technique used to improve the structural performance of a building. Bracing systems include wood or steel components...

  • Fire Sprinkler Systems Regulations

    Fire sprinklers are a building system used to prevent the spread of fire. They consist of a network of pipes connected to...

  • Difference Between Ceramic & Glass Fuses

    A fuse protects electrical appliances and equipment by breaking the electrical circuit in the event of an overload of current or a...

  • How to Build a 12V 5A Power Supply

    Any good hobbyist who likes to build electronic circuits knows the advantages of having a good power supply. The supply must be...

  • Types of Gypsum Board

    Gypsum board, also called drywall, plasterboard and wallboard, is used extensively in construction projects. The material makes a durable, strong, fire-resistant and...

  • The Four Types of Constructions

    Construction is the process of building anything that results in the completion or remodelling of a structure. Construction projects are commissioned either...

  • Types of Jobs in Construction

    The construction industry makes up a major part of the economy. Most people think of construction jobs when they see workers on...

  • Types of Building Constructions

    Buildings are classified by type of construction--literally how the building is constructed as dictated by the International Building Code. The classification takes...

  • Types of Construction Bids

    The type of construction bid used depends upon the type of project. Small projects most often will require a lump-sum bid. Large...

  • Types of Construction Plans

    Any building is an extremely complex arrangement of structural members, mechanical systems, and finishes. In order for builders to turn an architect's...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!