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Lessons / Decking and patterns
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Composite follows its own report
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Composite boards on joists at 24 in because the lumber rule allows it.
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
Composite and PVC follow their evaluation report; many call for 16 in square and 12 in on a diagonal.