C Purlin Roof Design. Metal building roof purlins provide three structural functions The eave purlin marks the first purlin at the wall connection. A traditional purlin strictly by definition is a horizontal structural member in a roof.
RHS purlins : For roofs where the support structure is visible once the construction is complete, RHS purlins may be used (rectangular hollow section).
Astron cold formed purlins are presented.
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C section purlins or cee section purlins are designed to form the walls and floor joists of a building shell structure, making them also ideal for In addition, our C section purlins can also be used for door framing, roof trimming, window trimming, parapet rails and side rails (also see Z purlins page). Tables in the Purlin Design manual are intended for use where roofing or cladding is attached to one DHS purlin or girt flange, where it is assumed that the. Cross section properties for C-purlins, both flanges supported.