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Strength grading of sawn timber in Europe
Lumber grading · Intermediate
How European sawmills sort structural timber into strength classes: standards (EN 14081, EN 338, EN 1912), visual and machine grading, the wood science behind them, worked calculations, and the limits of the evidence.
This course was drafted with AI assistance and has not yet been reviewed by an expert. Check important figures against a standard or your contract.
- 1. Why timber is graded: indicating properties and characteristic values 9 min
- 2. Strength classes: what C14 to C50 mean, and what to check 8 min
- 3. Visual grading: features, national rules and their limits 9 min
- 4. What the wood does: stiffness, knots, grain and moisture 10 min
- 5. Density, growth and juvenile wood: where the variation comes from 9 min
- 6. Machine grading: indicating properties, settings and yields 10 min
- 7. Reference moisture, regional variation, CE marking and limits of this course 9 min
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