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Solid Wood Seasonal Width Change Calculator

Estimate dimensional movement across a solid wood floor field from a species-specific DCC, board face width and seasonal wood moisture-content change.

Inputs

Project inputs

Range: 1–300 ft

NWFA notes that solid wood spans wider than 20 ft may need internal expansion spacing, depending on species, climate and site conditions.

Range: 0.5–12 in

Range: 0.0001–0.01 DCC

Enter the appropriate NWFA DCC for the species and movement direction. Example default only: Red Oak DCC 0.00369.

Range: -10–10 percentage points

Use target seasonal moisture content minus initial moisture content; a negative value represents drying/shrinkage. This is a change in percentage points, not a percent increase/decrease.

Result

Absolute summed change across rows
3.542 in
Estimated summed change across rows (derived)
3.542 in
Estimated movement per board
0.0738 in
Estimated board rows across field
48

How this is calculated

Estimated board rows across field
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