A C12x20.7 channel serves as a ledger for the stair landing and connects to a concrete tilt-up wall. The ledger is anchored using three-quarter-inch diameter Simpson Titen HD anchors at framing members and one three-quarter-inch diameter Titen anchor spaced at eighteen inches on center. A three-eighths by three-and-a-half by nine-inch plate connects the assembly with three three-quarter-inch diameter ASTM A325-N bolts. A five-sixteenth-inch typical fillet weld secures the steel connections.
C12x20.7 LEDGER FOR STAIR LANDING 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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