| 摘要 |
A steel sub-purlin for use in roof construction, the sub-purlin being fabricated using metal roll forming techniques. The sub-purlin has an upper, angled portion, a lower angled portion, a vertical section connecting the upper and lower sections and vertical extensions from said upper and lower angled portions positioned in contact with the vertical section. The ends of sub-purlin are positioned on steel truss caps, the truss caps being used in place of conventional wood nailers.
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