A C12 steel channel stringer bears on a 3/8-inch cap plate and a 1/2-inch base plate anchored to the floor slab by three-quarter-inch diameter expansion anchors with a six-inch minimum embedment. Twelve-gauge bent plates at each tread support two-inch thick lightweight concrete treads, welded with three-sixteenth-inch and one-eighth-inch welds having specific return lengths and spacings. One-and-a-half by one-and-a-half by three-sixteenth-inch angles, eight inches long, are centered on each tread at each end. A separate plan view details a half-inch plate with slotted holes.
2 1/2" 1" TYP 7" EQ EQ 3/4" Ø x EXPANSION ANCHOR w/ 6" MIN EMBED 1/4 PP CAP PL 3/8 C12 STRINGER 2" THICK, LWC TREAD, TYP 3/16 2-4 1/2" RETURNS AT ENDS 1/8 2-12 1" FROM ENDS BENT PL 12 GA AT EACH TREAD L1 1/2 x 1 1/2 x 3/16 x 0'-8" CENTER ON TREAD, EA. END PL 1/2 PL. 1/2" PLAN SLOTTED HOLE 7" 4 1/2"
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