Purlins, also known as purlines or trusses, are horizontal roof beams perpendicular to rafters or rafters to support rafters or roofing materials.
Purlins are transverse bent (usually in both directions) members and are typically designed as single-span purlins.
Commonly purlin has been used in terms of two kinds: solid web type and light steel truss type. C and Z shaped Purlin, as name implies, illustrates that steel plate are formed C and Z shaped Purlin by welding, rolling or cold bending forming.