Black duck II—building system with heat insulation and a passageway for fire retardant gas

A building panel system for constructing internal and external building structures and providing heat insulation and defining a continuous internal flow path for fire retardant, comprising:

• a plurality of panels, each said panel comprising a first panel sheet and a second panel sheet generally parallel to and spaced apart from said first panel sheet defining a panel interior in the form of a panel internal gap and a sheet interconnecting structure extending between and structurally joining together said first panel sheet and said second panel sheet;
• a gas contained within and substantially filling said panel internal gaps of a plurality of said panels, wherein said gas is one of air and a first retardant gas;
• and a plurality of panel splicing structures, each said splicing structure being perforated for passing gaseous fire retardant from the panel interior of one said panel to the interior of an adjacent said panel, such that all parts of said system are in fluid communication with each other and collectively define a system passageway;
• such that said panel internal gap between said first panel sheet and said second panel sheet provides a layer of air within each such panel for heat insulation, and said system passageway defined by fluid communication through interconnected panel internal gaps permits a selected fire retardant gas to be delivered into at least one system passageway entry point to flow throughout said system.