Betula pendula · structural & rotary veneer grading.
Birch, through the section.
Read a birch panel as a layered construction. Face quality, core continuity and glue-line performance require separate acceptance criteria, even when the finished object presents a single calm surface.
Specimen schedule
Nominal dimensions are reference examples. Inches, when selected, are rounded to three decimal places.
| Sample | Face / construction | Nominal size | Inspection note |
|---|---|---|---|
| BB–06 | Thin balanced panel | 6 mm | Review edge breakout |
| BB–09 | Utility cabinet back | 9 mm | Verify support spacing |
| BB–12 | Furniture carcass blank | 12 mm | Inspect core continuity |
| BB–18 | Exposed-edge specimen | 18 mm | Approve repair samples |
| BB–24 | Thick worktop blank | 24 mm | Check mass and fixings |
| VN–15 | Rotary veneer leaf | 1.5 mm | Confirm layup symmetry |
Species and trade descriptions
Betula pendula is silver birch. A commercial Baltic birch panel may include other birch species, so a trade description alone does not establish species identity. Ask for the supplier declaration when species or origin matters to the project.
Rotary cutting and the veneer face
Rotary peeling follows the log around its circumference, producing broad grain patterns. Tight and loose veneer sides can respond differently during finishing. Approve the actual surface treatment on a representative leaf or panel offcut.
Describe the repair allowance
Instead of relying on a letter grade alone, state permitted patches, open knots, colour variation and repaired splits. Supplier grading systems vary. Include a signed visual sample where a consistent face matters more than a shorthand code.
Structural use needs its own evidence
A veneer appearance grade is not a structural design value. Obtain the relevant manufacturer declaration and project-specific engineering review for load-bearing use. Keep that evidence attached to the ordered product and thickness, not just the species name.