Panelized roof construction featuring structural 1 wood sheathing installed parallel to rafters with staggered joints. Purlins are spaced at eight feet on center typical unless noted otherwise. Douglas Fir number 1 two by four members are spaced at twenty-four inches on center typical for rafters at warehouses, while Douglas Fir number 2 two by six members are spaced at twenty-four inches on center typical for rafters at offices. Edge nailing, intermediate nailing, and continuous edge nailing secure the wood panels. Detail references indicate specific conditions where four-inch nominal rafters occur.
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