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Tall decks sway
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A tall deck on long unbraced posts that racks sideways.
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
Up to 600 mm (23 9/16 in) from ground to joist underside no column bracing is required; above that, bracing is a design question.