Roof subpurlins frame into parallel joists using specific hardware connections and framing dimensions. Four-by-six subpurlins attach to the joist using an F46 connector paired with an A33 angle typically. Additional two-by-six framing requires F46 connectors with A34 angles. Curb framing above incorporates A35 angles and LSTA9 straps at each corner, fastened with ten-penny nails at twelve inches on center around the perimeter.
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