Transferring the wind loads to the main frame, rafters and columns. Thus providing structural stability to the main frames by connecting them all along the building.
Supporting the Roof System i.e. the enclosure of the building.
Purlins are the structural load carrying members. The wind forces acting on the End Walls of the building get transferred by purlins to the main frame members and to the foundation, by means of bracings.
Purlins also supports roof system, and are designed to take care of wind load acting on the roof, Live Load, Dead load of Sheeting or roofing and collateral loads like Ventilation duct load, sprinklers, lightings etc.
Thus, Purlins are an important component of the building.
