WHAT F U C K
A purlin is a wooden beam or girder placed along the length of the hood or roof , the two short sides are parallel to the roof to bear.Purlins are used to carry the roof, consisting of roof boarding with the roof and other taxes such as wind and snow. Purlins running from truss to truss or truss to wall or other support points. For timber felling, the spacing of the purlins approximately 110 to 150 cm.The weight (size) and distance is determined by a calculation, usually by a constructor is executed. The forces are transmitted from the pegs on the underlying structure .The name is used for both wooden and thatched roof and steel.
Google'd gording. Got a wikipedia article .Its not in english, english page was deleted. Translates to
