A C12x20.7 channel functions as a stair landing ledger and is secured to a seven and a quarter inch concrete tilt-up 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 using two three-quarter inch diameter ASTM A325-N bolts. A quarter-inch fillet weld joins the channel and plate components.
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"
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