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Lessons / Beams, posts and cantilevers
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How far joists may overhang
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A 24 in cantilever on 2x8 joists.
Every number here is a working estimate. Check it with your building authority.Turn JavaScript on to work the lesson. The drawing shows how it starts.
The rule this lesson teaches
Joists may run past the beam 8 in on a 2x4, 16 in on a 2x6 or 2x8, and 24 in on a 2x10 or 2x12.