Length in the direction the decking boards run.
Width covered by side-by-side board rows.
Actual board face width, not nominal size.
Planned gap between installed boards.
Length of one purchased deck board.
Extra boards for cut waste, defects, layout changes and attic stock.
On-center joist spacing used for the screw count estimate.
Typical decking uses two screws per board at each joist line.
Optional unit price for material-cost estimate.
Rounded up after the waste allowance.
Also computed
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