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purlin
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Four purlins (the main longitudinal timbers) run along the roof, with quatrefoil wind braces between them.
In the process, the various components acquired names according to their place in this system - king post, hammer beam, purlin , sill, and so forth - names that are still used today.
Extra outlet space can be got by raising every third row of roof sheeting by inserting battens over the purlins and nailing the sheets to these battens and purlins .
Roof purlins were placed on these members, so avoiding straight lines.
If the roof ridge or a purlin crosses the opening, you'll have to relocate the opening and use an angled or splayed light shaft between the roof and the ceiling.
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