A stair stringer connects to a supporting steel beam sized per the framing plan, featuring a three-inch wide by one-quarter-inch thick plate with a one and five-eighths inch diameter machine bolt. A four-inch continuous wood nailer sits atop the steel beam, with the tread dimension sized per plan. A three-sixteenths inch fillet weld secures the assembly. The stringer and joists are sized per the framing plan, and architectural drawings dictate the exact profile of the steps.
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