Wood Shrinkage
Also known as: dimensional change, anisotropic shrinkage
Wood shrinkage is the dimensional change that occurs as wood loses moisture from green (freshly felled) to oven-dry condition. Wood shrinks anisotropically: tangentially (along growth rings) more than radially (from center to edge), and both more than longitudinally (along the grain). Measuring shrinkage percentages is essential for understanding wood drying behavior, predicting checking and warping, and selecting materials for applications sensitive to dimensional change (flooring, cabinetry, musical instruments).
Key highlights
- Provides direct dimensional-change data in three anatomical directions, essential for predicting wood movement in service
- Standardized test (ASTM D143) allows comparison across species and growing conditions
- Low-cost procedure requiring only calipers and an oven
Intuition
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How it works
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When to use it
Use wood shrinkage measurement when selecting wood species for applications sensitive to dimensional stability — such as flooring, cabinetry, musical instruments, or structural joinery — or when assessing drying behavior and predicting checking and warping during kiln drying.
Strengths & limitations
- Provides direct dimensional-change data in three anatomical directions, essential for predicting wood movement in service
- Standardized test (ASTM D143) allows comparison across species and growing conditions
- Low-cost procedure requiring only calipers and an oven
- Measured on small clear specimens; real-world lumber with defects may behave differently
- Shrinkage is strongly influenced by grain angle and ring curvature; oblique cuts introduce bias
- Does not capture time-dependent moisture sorption dynamics or creep under load
Sources
- 1.ASTM D143-19. (2019). Standard test methods for small clear specimens of timber. ASTM International.
- 2.Skaar, C. (1988). Wood-Water Relations. Springer-Verlag.
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Cite this page
ScholarGate. (2026, June 3). Wood Shrinkage. ScholarGate. https://scholargate.app/forestry/wood-shrinkage