Creating Purlins

Parameter	Description
Purlin Size	Specifies the purlin size in width x height, in current file units. Sizes can be edited by selecting Edit List (see Custom Frame Element Sizes).
Elevation of First Purlin	Specifies the elevation above finished floor of the bottom of the lowest purlin
Elevation of Last Purlin	Sets the elevation from the top of the roof to the last purlin
Create Purlins by:
Number of Purlins	Indicates the number of purlins to create; the purlins are evenly spaced between the first and last purlins
Distance Between Purlins	Specifies the distance between purlins; the number of purlins created is based on this value
Purlin Position
Top of Rafter	Matches the tops of the purlins to the top of the roof object, as for roof tile supports
Bottom of Rafter	Matches the tops of the purlins to the bottom of the roof, as when the purlins support the rafters
Purlins Start at the Lower End of the Rafter	Sets the elevation of the first purlin to start from the lower end of the rafter
Rotate Purlins to Roof Slope	Rotates the purlins so that they match the slope of the roof
Bearing inset	Specifies the depth at which the purlin is notched into the rafters; if purlins are rotated this field appears dimmed since the inset only applies to horizontal purlins
Class	To control appearance and visibility, select a class from the list of classes present in the drawing or create a new class (see Creating Classes)
Classes	Edits class attributes
Object Attributes	Specifies the purlin attributes