FRAME (FRM)

Buildings characterized by combustible construction.  The exterior walls are constructed of wood or steel studs, covered with wood siding, shingles, stucco, brick or stone veneer.

JOISTED MASONRY (JM)

Buildings with exterior walls constructed of masonry material such as brick, concrete block, stone or similar materials.  The floors and roof are wholly or partially constructed of wood or other combustible materials.

NON-COMBUSTIBLE (NC)

Buildings with structural steel framing members.  Walls and roofs are usually constructed of metal panels or sandwich panels.  Pre-engineered steel frame buildings are included in this class.

MASONRY NON-COMBUSTIBLE (MNC)

Buildings with exterior walls constructed of masonry material such as brick, concrete block, stone or similar materials supported by structural steel frame.  The structural steel frame is not fireproofed.

Modified fire resistive (mfr)

Buildings with structural steel frame that are fireproofed with masonry, concrete, plaster, gypsum or other noncombustible material.  The walls are noncombustible materials and floors and roof are reinforced concrete or concrete on fireproofed steel deck.

FIRE RESISTIVE (FR)

Buildings with reinforced concrete frame.  The walls are non-combustible materials and floors and roof are reinforced concrete or concrete on fireproofed steel deck.