An MC 12x10.6 channel ledger supports the stair landing against a seven and a quarter inch concrete tilt-up wall. The ledger is secured to the concrete wall using half-inch diameter Simpson Titen HD anchors spaced at eighteen inches on center. A three-eighths by three and a half by nine inch steel plate connects to the assembly with two three-quarter inch diameter ASTM A325-N bolts and a quarter-inch fillet weld.
MC 12"x10.6 LEDGER FOR STAIR LANDING 1/2" DIA. SIMPSON TITEN HD ANCHORS @ 18" O.C. 7 1/4" CONCRETE TILT-UP WALL 3/8"x3-1/2"x9" PLATE w/ (2) 3/4" DIA. A-325 N BOLTS 1/4" / // O o —
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