How Much Will A Quartersawn White Oak Panel Move
+0.1344" (+3.4 mm)
- Species: White Oak (radial shrinkage 5.6%)
- Starting width: 12"
- Moisture content: 6% -> 12% (a typical dry-to-humid seasonal swing)
MethodΔD = D x ΔMC x (shrinkage% / 30 / 100)
Your actual humidity swing may be smaller or larger than the 6-12% MC example used here — run your own numbers in the movement calculator.
A 12" wide quartersawn white oak panel will grow about +0.1344" (+3.4 mm) across its width moving from 6% to 12% moisture content — a little over half of what the same width moves flat-sawn, because quartersawn stock presents its more stable radial face rather than the tangential face a flat-sawn board shows.
Why this one specifically
White oak's radial shrinkage (5.6%) runs almost half its tangential figure (10.5%), a wider gap between the two than most domestic species show, which is part of why quartersawn white oak carries a premium at the lumberyard beyond its famous ray-fleck figure. Builders who need a wide, stable panel and can afford to pay more per board foot for quartersawn stock are trading lumber cost for a real, measurable reduction in seasonal movement, not just buying a look.
What moves the number
Width is still the direct multiplier — a wider quartersawn panel moves proportionally more, it simply starts from a lower baseline than flat-sawn stock of the same species. The size of the actual seasonal humidity swing in your shop matters as much as the species choice; a milder climate moves any panel less than the 6-12% MC example used here.