A C12x20.7 steel channel serves as the stair landing ledger bearing against a seven-and-a-quarter-inch concrete tilt-up wall. The channel is anchored to the wall using half-inch-diameter Simpson Titen HD concrete screw anchors spaced at eighteen inches on center. A three-eighths-by-three-and-a-half-by-nine-inch steel plate is welded to the assembly with a quarter-inch fillet weld and fastened with two three-quarter-inch-diameter A-325-N bolts.
C12x20.7 LEDGER FOR STAIR LANDING 1/2"Ø 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"Ø A-325 N BOLTS 1/4" is .A IS <> £s IS A 6. IS m
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