Construction Type Definitions Frame:
Frame construction is where the exterior walls, bearing walls, and partitions and the structural floors, roof, and their supports are wholly or partly of wood or other combustible materials. The exterior walls may have a metal or vinyl siding. Joisted Masonry: Combustible Floors and Roofs: Combustible floors and roofs on non-combustible, slow burning, or combustible supports, or non-combustible or slow-burning floors and roofs on combustible supports. Steel/Non-Combustible: In metal, non-combustible construction, a system of prefabricated steel framing metals is used. The roof is usually constructed of metal panels. The exterior walls may be of metal siding, sandwich panels, masonry metals, corrugated metal, corrugated plastic, or insulated metal panels. Masonry Non-Combustible: Comprised of non-combustible materials that either fail to meet the full requirements for fire-resistive construction or are without fireproofing protection for structural steel elements. Some combustible materials may be used in buildings classed as non-combustible roof construction. These include corrugated sheet metal, precast concrete and gypsum plank, tile, poured gypsum lightweight concrete, and insulated metal deck of the type that will not contribute to an interior fire. Floors are made of concrete on cellular, corrugated metal panels, or reinforced concrete. Typical materials used for walls of non-combustible buildings include brick and cinder blocks. Fire Resistive: Exterior Walls or Exterior Structural Frame • Solid masonry, including reinforced concrete • Hollow masonry less than 12 inches, but not less than 8 inches in thickness, with a listed fire-resistance rating of not less than two hours • Assemblies with a fire-resistance rating of not less than two hours Floors and Roof • Monolithic floors and roofs (massive, solid and uniform) of reinforced concrete with slabs not less than 4 inches in thickness • Construction known as “Joist Systems” with slabs supported by concrete joists spaced not more than 36 inches on centers with a slab thickness of not less than 2 3/4 inches • Floor and roof assemblies with a fire-resistance rating of not less than two hours Structural Metal Supports • Horizontal and vertical load-bearing protected metal supports (including pre-stressed concrete units with a fire resistance rating of not less than two hours Modified Fire Resistive: Buildings with exterior walls, floors, and roof constructed of masonry materials described above, but deficient in thickness; or fire-resistive materials described above with a fire-resistive rating of less than two hours, but not less than one hour.
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