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An energy barrier is made of adjustable width insulating rails, reflective insulation panels and a gasketing element to create a single layer or multi-layer stack of reflective dead air spaces within cavity spaces of framing members of a building envelope where an efficient energy barrier is desired

An energy barrier is made of adjustable width insulating rails, reflective insulation panels and a gasketing element to create a single layer or multi-layer stack of reflective dead air spaces within cavity spaces of framing members of a building envelope where an efficient energy barrier is desired.

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1. A heat barrier comprising adjustable width insulating foam plastic rails, reflective insulation panels and gasketing elements assembled into a single layer or multi-layer stack of reflective dead air spaces within cavity spaces between wooden framing members of a building having said reflective i

1. A heat barrier comprising adjustable width insulating foam plastic rails, reflective insulation panels and gasketing elements assembled into a single layer or multi-layer stack of reflective dead air spaces within cavity spaces between wooden framing members of a building having said reflective insulation panels inserted in a slot cut along the length of each of said foam plastic rails installed within said cavity spaces between said wooden framing members on opposite sides of said cavity spaces so that said reflective insulation panels are supported in said slots between said wooden framing members in parallel with a floor, wall, or ceiling of said building with said dead air spaces ended by said gasketing elements extending between said wooden framing members at ends of said reflective insulation panels, each foam plastic rail comprising a pedestal section and a receptacle section, said receptacle section and said pedestal section together formed with said slot in between for providing said support for sides of said reflective insulation panels inserted therein. 2. A foam plastic rail for a heat energy barrier comprising a pair of foam plastic rails inserted on opposite sides of a cavity formed by wooden framing members and a floor, wall or ceiling surface, said foam plastic rail for supporting a side of a reflective insulation panel installed to form said heat energy barrier, said rail for insertion in the cavity formed by said wooden framing members and the floor, wall or ceiling surface, said foam plastic rail having a slot cut along the length of said foam plastic rail for accepting the side of the insulation panel on one side of the energy barrier so that said reflective insulation panel is supported in said slot between said wooden framing members in parallel with said floor, wall or ceiling surface to form an insulated reflective dead air space between said reflective insulation panel and said floor, wall or ceiling surface, said foam plastic rail comprising a pedestal section and a receptacle section, said receptacle section and said pedestal section together formed with said slot in between for said supporting said side of said reflective insulation panel opposite another side supported by said other foam plastic rail of said pair, said receptacle section comprising an overhang section connected to said pedestal section by a connecting section, said overhang section positioned opposite a flat shelf surface side of said pedestal section so as to form said slot between said overhang section and said pedestal section, said pedestal section formed with a rail cavity in a side opposite said flat shelf surface, said rail cavity having an overhang section cavity shape so as to mate with an overhang section of another foam plastic rail in a stacked rail configuration. 3. The foam plastic rail of claim 2, wherein said pedestal section formed with a rail cavity is for mating with said overhang section of said another foam plastic rail mounted thereon within the cavity so as to support another reflective insulation panel forming another insulated reflective dead air space layered above the insulated reflective dead air space. 4. A method for assembling a heat energy barrier in a cavity formed between wooden framing members of a building, comprising: placing a pair of foam plastic rails on opposing sides of said cavity, each foam plastic rail comprising a pedestal section and a receptacle section, said pedestal section and said receptacle section together formed with a slot cut along the length of said foam plastic rail for accepting a side of an insulation panel on one side of said heat energy barrier in said cavity,inserting sides of said reflective insulation panel in opposing slots formed in said foam plastic rails so that said reflective insulation panel lies in parallel to a floor, wall or ceiling surface with a reflective side facing said surface, said opposing slots providing support for said sides of said reflective insulation panel inserted therein, andinserting gasketing elements extending between said wooden framing members at ends of said reflective insulation panel to form an insulated reflective dead air space bounded by said surface, said wooden framing members, and said heat barrier comprising said reflective insulation panel, said foam plastic rails, and said gasketing elements assembled between said wooden framing members. 5. The method of claim 4, further comprising: placing a second pair of foam plastic rails on the pair of foam plastic rails of claim 4, also on opposing sides of said cavity, andinserting a second reflective insulation panel in opposing slots formed in said second pair of foam plastic rails so that said second reflective insulation panel also lies in parallel to the floor, wall or ceiling surface, inserting second gasketing elements extending between said wooden framing members at ends of said second reflective insulation panel to form a second reflective dead air space bounded by the reflective insulation panel of claim 4, the second reflective insulation panel, the second pair of foam plastic rails, the second gasketing elements and the wooden framing members. 6. The method of claim 5, further comprising: placing a third pair of foam plastic rails on the second pair of foam plastic rails, also on opposing sides of said cavity, andinserting a third reflective insulation panel in opposing slots formed in said third pair of foam plastic rails so that said third reflective insulation panel also lies in parallel to the floor, wall or ceiling surface, inserting third gasketing elements extending between said wooden framing members at ends of said third reflective insulation panel to form a third reflective dead air space bounded by the second reflective insulation panel, the third reflective insulation panel, the third pair of foam plastic rails, the third gasketing elements and said wooden framing members. 7. A foam plastic rail comprising a pedestal section and a receptacle section, said foam plastic rail insertable on one side of a building bay opposite another foam plastic rail on an opposing side of said building bay, said foam plastic rail and said other foam plastic rail for supporting a heat barrier in between each other so as to form an air cavity between said heat barrier and an opposing building surface, said receptacle section and said pedestal section together formed to support one side of said heat barrier opposite another side supported by said other rail, said receptacle section comprising an overhang section connected to said pedestal section by a connecting section, said overhang section positioned opposite a flat shelf surface side of said pedestal section so as to form a slot between said overhang section and said pedestal section, said pedestal section formed with a rail cavity in a side opposite said flat shelf surface, said rail cavity having an overhang section cavity shape so as to mate with an overhang section of another rail in a stacked rail configuration. 8. The rail of claim 7, wherein said stacked rail configuration is for transport to a construction site, or for installation at the construction site, or for both.