A steel stringer frames down to a concrete foundation detailed with a concrete grade beam reinforced by two continuous number five rebar. The inside stringer connects via a four-by-four-by-one-quarter-inch angle, zero feet eight inches long, secured with two three-quarter-inch diameter anchor bolts or expansion bolts at five inches on center. Three-sixteenth-inch fillet welds attach the assembly at the stringer base. Bar grating with diamond plate spans the stair treads, receiving angle connections furnished by the manufacturer.
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