Douglas Fir rafters are spaced at twenty-four inches on center, with size variations specified for warehouse versus office areas. Structural 1 plywood sheathing is installed parallel to the rafters with staggered joints, secured by continuous edge nailing and intermediate nailing per the structural nailing diagram. Purlins are spaced at eight feet on center unless noted otherwise. A reference callout directs to detail two where four-inch rafters occur.
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