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Joist direction lines define the direction in which joists run in a floor or ceiling platform and can only be drawn in floor plan view.
Floor and Ceiling Framing
10229 - Floor Framing
326 - Specifying Joist Direction and Where Joists are Cut
328 - Framing a Floor with the Beam and Post Tools
339 - Framing with Floor and Ceiling Trusses
5203 - Using Bearing Walls, Beams and Lines
503 - Manually Editing Floor Platform Framing
327 - Mixing Joist Depths and Directions on the Same Floor
317 - Building a Floor Platform That Ledgers Inside the Foundation Walls
319 - Changing Floor Joist and Wall Framing Types