An aluminum window system mullion abuts a metal stud framing wall assembly featuring half-inch glass-mat gypsum sheathing board and a weather-resistant barrier. A prefinished aluminum angle matching the mullion is anchored at the joint. The gap between the storefront assembly and the wall framing is sealed with a foam backer rod and sealant. Cavity insulation is provided per energy calculations behind the interior framing, with an outline indicating the future interior finish.
ALUMINUM WINDOW SYSTEM MULLION OUTLINE OF FUTURE FINISH METAL STUD FRAMING BACKER ROD AND SEALANT INSULATED GLASS WRB. OVER 1/2" GLASS-MAT GYPSUM SHEATHING BOARD INSULATION PER ENERGY CALCULATIONS PRE-FINISHD ALUMINUM ANGLE TO MATCH MULLION
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