A C12x20.7 structural steel channel serves as the stair landing ledger and is secured to a concrete tilt-up wall. The channel connects via a 3/8-inch by 3-1/2-inch by 9-inch steel plate fastened with two 3/4-inch diameter ASTM A325-N bolts. The ledger assembly attaches directly to the concrete wall using two 1/2-inch diameter by 4-inch Simpson Titen HD heavy-duty anchors spaced at 18 inches on center. A 1/4-inch fillet weld secures the channel and plate assembly. The concrete wall is detailed per plan specifications.
C12x20.7 LEDGER FOR STAIR LANDING (2) 1/2"Ø x 4" SIMPSON TITEN HD ANCHORS @ 18" O.C. CONCRETE TILT-UP WALL PER PLAN 3/8"x3-1/2"x9" PLATE w/ (2) 3/4"Ø A-325 N BOLTS 1/4" 6" — A // A A< O A < A A
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