A galvanized C12x20.7 channel serves as a stair landing ledger and is secured to a concrete tilt-up wall using three-quarter-inch-diameter Simpson Titen HD anchors spaced at eighteen inches on center. The channel connects to a three-eighths-by-three-and-a-half-by-nine-inch connection plate utilizing three three-quarter-inch-diameter A-325 N bolts. A five-sixteenths-inch fillet weld ties the channel to the plate assembly typical.
C12x20.7 LEDGER FOR STAIR LANDING GALVANIZED 3/4" DIA. SIMPSON TITEN HD ANCHORS @ FRAMING MEMBERS AND (1) 3/4" DIA. TITEN AT 18" O.C. CONCRETE TILT UP WALL, SEE PLANS 3/8"x3-1/2"x9" PLATE w/ (3) 3/4" DIA. A-325 N BOLTS 5/16 TYP.
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