Creating purlins

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 is grayed 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