A C12x20.7 channel ledger supports the stair landing against a concrete tilt-up wall. The ledger is anchored to the concrete using three-quarter-inch diameter by five-inch Simpson Titen HD anchors at framing members and one-quarter-inch Titen anchors spaced at eighteen inches on center. A three-eighths by three-and-a-half by nine-inch plate connects the assembly using three three-quarter-inch diameter A-325 N bolts with typical five-sixteenth-inch welds.
C12x20.7 LEDGER FOR STAIR LANDING 3/4" DIA. x 5" 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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