Purlins typically refer to members of the roof structure that extend parallel to the  building eaves and support the roof deck or sheets. The purlins are in turn supported by beams or walls. These purlins are widely used in large roof decks, factories, workshops, and many industrial sheds. Zincalum Mfg. has the best quality materials and offers C purlins and Z purlins in various specifications, depending on the customer's needs.