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Noncombustible Construction

Construction Class 3


This Construction Brief will give you an overview of Verisk's Construction Class 3 — noncombustible construction. When you have completed this course, you'll know what a Verisk report means when it says a building is noncombustible construction. And you'll understand why a particular structure is—or isn't—noncombustible.


  • Buildings with exterior walls, floors, and roofs of noncombustible or slow-burning materials
  • Building supports of noncombustible or slow-burning materials
  • Noncombustible or slow-burning roof decks on noncombustible or slow-burning supports—regardless of the type of insulation on the roof surface


Advantages of noncombustible construction

  • Easy to erect
  • Economical to build
  • Uses materials that do not readily burn


Disadvantages of noncombustible construction


Disadvantages of noncombustible construction

  • Contains steel, which loses strength at high temperatures
  • Highly damageable buildings
  • Unstable buildings under fire conditions
  • Uses slow-burning materials that do burn—adding fuel to a fire

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