A curtain wall spandrel panel intersection incorporates insulating-glass units and a vertical aluminum mullion shown beyond. Polyisocyanurate foam-plastic board insulation with foil or glass-fiber-mat facing backs to a 1/8-inch aluminum sheet metal back pan. The components are specified with standard construction section numbers including insulating-glass units, aluminum sheet metal back pans, and polyisocyanurate board.
VERTICAL MULLION, BEYOND 08 80 00.C INSULATING-GLASS UNITS 07 21 00.D1 POLYISOCYANURATE FOAM-PLASTIC BOARD, [FOIL FACED] [GLASS-FIBER-MAT FACED] 08 44 23.F1 SHEET METAL BACK PAN 08 44 23.F1 SHEET METAL BACK PAN 1/8" ALUMINUM
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