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ISO CONSTRUCTION CLASS |
| CLASS 1 [Construction Type A] - Frame
A building where the exterior walls and partitions, and the structural floors and roof, and their supports are wood or light-gauge metal. |
| CLASS 2 [Construction Type B] - Masonry (Joisted Masonry)
A building that has the exterior walls constructed of masonry materials such as brick, hollow or solid concrete block, concrete, gypsum block, clay tile, stone, or similar materials. The structural floors and roof are of wood or light-gauge metal. |
| CLASS 3 [Construction Type C] - Pre-engineered Metal (Non-Combustible)
A building that employs a system of pre-engineered rigid steel framing members. The exterior walls are of metal siding, sandwich panels, or masonry, and the roof is clad with metal roofing or sandwich panels. |
| CLASS 4 [Construction Type D] - Steel Frame ( Masonry Non-Combustible)
A building where the structural floors and roof are of unprotected non-combustible materials such as metal decking or concrete on metal decking, and are supported by an unprotected structural steel frame, fire resistive exterior walls, or a combination of both. |
| CLASS 5 [Construction Type E] - Protected Steel Frame (Modified Fire Resistive)
A building where the structural floors and roof, and their supports are of non-combustible construction with a fire rating of not less than on one hour. A building very similar to Construction Type 4, Steel Frame; however, in type 5, the non-combustible floor, roof, and framing components are protected with sprayed-fiber fireproofing. |
| Questions?800.423.7099 |
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updated on 2-6-2009