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Joist Direction Lines specify joist direction, and Bearing Lines define the boundaries for joist direction. Bearing lines also specify where joists are cut, as can walls and beams.
Floor and Ceiling 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