Purlins spaced at eight feet on center unless noted otherwise support a panelized roof construction. Structural one wood sheathing runs parallel to rafters with staggered joints, using thickness specified in the nailing diagram. Douglas fir number one two-by-four framing occurs at twenty-four inches on center typically for rafters at the warehouse, while Douglas fir number two two-by-six framing occurs at twenty-four inches on center typically for rafters at the office. Edge nailing, intermediate nailing, and continuous edge nailing secure the sheathing panels. Where four-inch nominal rafters occur, specific conditions apply per referenced details.
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