Building construction with meltable insulation and reservoir trough therefor

A building structure comprising a pair of spaced confronting structural members, a pair of spaced uprights between the structural members and cooperating therewith to collectively define an interior compartment, a partition having a body formed of imperforate material and mounted within the interior compartment to extend generally horizontally therein and providing an imperforate sealing member for the interior compartment, the body of the partition being elongated and defining an upwardly opening cavity, and meltable insulation received within the compartment above the partition, the meltable insulation being of low heat capacity and which, when subjected to heat, undergoes a phase change transition from a solid to a flowable molten mass of decomposed combustible insulation, the cavity of the partition serving to receive and contain the flow of insulation melt in the event of fire.