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Lessons / Decking and patterns
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Diagonal boards pull joists closer
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Diagonal 5/4 boards on joists at 16 in, so each board spans about 22 1/2 in.
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
A board laid at 45 degrees spans about 1.41 times the joist spacing.