Length: 200-600 cm.
Quality: A, AB,B,C,CD
- A (four faces clean, wood-coloured knots allowed up to 5 mm)
- AB (three faces clean, sapwood allowed on the edge of the board, knot allowed up to 5 mm or a healthy knot up to 15 mm on the face of poorer quality)
- B (one face clean, knots allowed up to 20 mm per two meters in length, sapwood allowed on the edges of the board-30% of the total length)
- C (healthy knots without restrictions, black knots on the face of poorer quality, sapwood allowed)
- CD (knots, heart and sapwood without restrictions).