Moisture & Thickness Tolerance

Precision is what separates Baltic Birch from construction-grade plywood.

Understanding these tolerances is critical for CNC operators and joinery design.

• Metric, Not Imperial: Baltic Birch is manufactured to strict metric standards, not Imperial inches. A “3/4 inch” sheet is actually 18mm (~0.709”).
• Nominal vs. Actual: Unlike domestic plywood which is intentionally undersized (e.g., a ¾” sheet is often 23/32”), Baltic Birch is true to its labeled metric thickness.
• Precision for Joinery: The thickness tolerance is exceptionally tight, typically within +/- 0.4mm per sheet. This consistency is vital for CNC operations, ensuring that dadoes, rabbets, and box joints fit perfectly without being too loose or requiring excessive sanding.

• Kiln-Dried Stability: Panels are kiln-dried at the mill to a moisture content of 6% to 12%. This low moisture level is essential for preventing fungal decay and ensuring the adhesive bonds correctly.
• Acclimatization: While the sheets leave the mill stable, wood is hygroscopic. It is highly recommended to let sheets acclimatize in your shop for 48 hours before cutting. This allows the panel to reach equilibrium with your shop’s humidity, significantly reducing the risk of bowing or twisting after cutting.