To limit the probability that light-frame construction walls, columns, arches, beams and loadbearing steel elements exposed to fire will fail or collapse prematurely, which could lead to the failure or collapse of the floor or roof assembly, which could lead to damage to the building.
To limit the probability that light-frame construction walls, columns, arches, beams and loadbearing steel elements exposed to fire will fail or collapse prematurely, which could lead to the failure or collapse of the floor or roof assembly above, which could lead to the spread of fire from a lower storey of a building to an upper storey or to the exterior, which could lead to damage to the building.