Roof Purlins can be specified using the Roof Surface Definition dialog.
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Roof Framing
256 - Automatic Roof Trusses
343 - Stick Framing a Roof
10230 - Roof & Truss Framing
333 - Framing Attic Walls with End Trusses
1030 - Exposed Rafter Tails
346 - Framing with a Truss Roof System
353 - Framing with Scissor Trusses
405 - Drawing Decorative Beam or Truss Symbols
505 - Creating a SIP Roof Assembly
1969 - Framing an Overbuild Using Rafters
350 - Framing an Overbuild Using a Truss Base
348 - Framing a Cantilevered Truss Roof System
199 - Creating Roof Purlins
356 - Framing a Skylight Well with Trusses
347 - Framing and Bracing a Truss Roof System without Lookouts
5318 - Setting Truss Lookout Spacing and Viewing Selected Truss Details
351 - Hip Trusses - Building a Step-down Hip
352 - Hip Trusses - Building a Sub-girder Hip
502 - Hip Trusses - Drop Hip or California Hip
354 - Framing with Attic Trusses