Protected Steel Frame / Modified Fire Resistive (ISO 5)

A building where the structural floors and roof, and their supports are of non-combustible construction with a fire rating of not less than one hour. A building very similar to Construction Type D - Steel Frame; however, in Type E the non-combustible floor, roof, and framing components are protected with sprayed-fiber fireproofing. Buildings classified as ISO Class 5 are characteristic of this type.