A C12x20.7 channel ledger supports the stair landing against a concrete tilt-up wall per plan. The ledger is anchored directly to the concrete wall using half-inch diameter by four-inch Simpson Titen HD heavy-duty anchors spaced at eighteen inches on center. A three-eighths by three-and-a-half by nine-inch plate connects the assembly with two three-quarter-inch diameter A-325 N bolts and a quarter-inch fillet weld.
C12x20.7 LEDGER FOR STAIR LANDING (2) 1/2"Ø x 4" SIMPSON TITEN HD ANCHORS @ 18" O.C. CONCRETE TILT-UP WALL PER PLAN 3/8"x3-1/2"x9" PLATE w/ (2) 3/4"Ø A-325 N BOLTS 1/4" 6"
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