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On the Trusses tab of the Build Roof dialog, you can specify the Ceiling Step, which is the maximum distance its bottom chord can step down to locate a ceiling on the floor below the top floor.
343 - Framing a Roof
505 - Creating a SIP Roof Assembly
1030 - Automatic Framing - Exposed Rafter Tails - Sub Fascia and Sheathing
405 - Drawing Decorative Beam or Truss Symbols
344 - What is a Truss?
345 - Setting Truss Defaults
346 - Framing a Truss Roof System
350 - Using a Truss Base to Truss Intersecting Roofs
348 - Framing a Cantilevered Truss Roof System
349 - Framing with Energy Heel Trusses
353 - Framing with Scissor Trusses
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
1033 - Using the Ceiling Step Truss Command
9914 - Focus: Creating Trusses
10109 - Quick Tip - Timber Frame Truss