Want more info? Here are some construction class definitions!
1. Frame (Class 1): Buildings where the exterior walls are wood or other combustible
materials, including construction where combustible materials are combined with
other materials (such as brick veneer, stone veneer, wood iron-clad, stucco on wood).
2. Joisted Masonry (Class 2): Buildings where the exterior walls are constructed of
masonry materials such as adobe, brick, concrete, gypsum block, hollow concrete
block, stone, tile or similar materials and where the floors and roof are combustible
(disregarding floors resting directly on the ground).
3. Non-Combustible (Class 3): Buildings where the exterior walls, floors and roof are
constructed of, and supported by metal, asbestos, gypsum, or other non-combustible
materials.
4. Masonry Non-Combustible (Class 4): Buildings where the exterior walls are
constructed of masonry materials, as described in Joisted Masonry above, with the
floors and roof of metal or other non-combustible materials.
5. Modified Fire Resistive (Class 5): Buildings where the exterior walls, floors and roof
are constructed of masonry or fire resistive materials with a fire resistance rating of
one hour or more but less than two hours.
6. Fire Resistive (Class 6): Buildings where the exterior walls and the floors and roof
are constructed of masonry or fire resistive materials having a fire resistance rating of
not less than two hours.
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