Framing layout showing maximum openings, joist hangers, and sub-purlins between steel bar joists. Steel bar joists frame the perimeter, supporting sub-purlins spaced at twenty-four inches on center and double framing members at openings. Openings accommodate sizes up to one foot six inches by one foot six inches and four feet by eight feet with typical Simpson hangers or approved equals. Plywood sheathing allows a maximum eight-inch diameter hole.
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